74results about How to "Reduce stacking fault energy" patented technology

The invention discloses a titanium alloy and a preparing method thereof, the titanium alloy comprises chemical components in percent by weight: 33wt%-40wt% of Nb, 0.3wt%-0.5wt% of O and the balance of Ti; or the alloy comprises the components in percentage by weight: 33wt%-40wt% of Nb, 0.3wt%-0.5wt% of O, one or more of following element groups: 0-3wt% of V, 0-1wt% of Mo, 0-3wt% of Al, 0-3wt% of Sn and 0-4wt% of Zr and the balance of Ti. Components of the alloy in the invention are optimally designed, low-stacking fault energy large-sized ultra-fine grain / nanocrystalline titanium alloy can be obtained by smelting, thermal processing and cold processing, the titanium alloy has excellent match of strength and plasticity, the preparing method breaks through limitation of preparing of a titanium alloy nano-material in the prior art, processing control difficulty and manufacturing cost are reduced, the production efficiency is improved and the titanium alloy and preparing method have a broad application prospect.

The invention discloses a high-performance high-entropy alloy and a processing method thereof. Certain content of an element carbon is added into a Fe40Mn40Co10Cr10 alloy to form an interstitial solid solution with a basal body, so that stacking fault energy of the material can be effectively reduced, twin crystals can be induced under the room-temperature condition, and extra strength increment is provided for the basal body by performing solid solution and separating carbides through the element carbon. The element carbon is used as a good interstitial atom and the carbide is used as an effective precipitation strength phase; heat preservation is performed for a relatively long time at a relatively high temperature in the last step, an as-forged microstructure is partly or completely eliminated, and part of the precipitated phase is dissolved to form a nearly single phase structure, so that the alloy has relatively great performance controllable space again on the basis of higher performance level, further strengthening is favorably performed through other strengthening ways such as deformation strengthening and precipitation strengthening to obtain more reasonable strength and plasticity match; and moreover, content of overall alloy elements is reasonable, cost is low, and economical efficiency is relatively strong.

A novel scandium-containing cast aluminum-lithium alloy is disclosed. The alloy includes, by weight, 1.6-1.99% of Li, 0.9-1.9% of Cu, 0.2-0.7% of Mg, 0.1-0.25% of Zr, 0.05-0.35% of Sc, and impurity elements which are Fe, Si, Na, K and P, with the balance being Al, with the Fe content being less than 0.15% and the total content of the impurity elements being less than 0.25%. During preparation, Al-Cu and Al-Zr master alloys, pure aluminum, pure Mg and pure Li are smelted to obtain an aluminum alloy; then three stages of solid solution heat treatment are performed including solid solution heat treatment at 440-460 DEG C for 32 h, solid solution heat treatment at 510-520 DEG C for 24-32 h and solid solution heat treatment at 530-540 DEG C for 1-6 h; and after water quenching, artificial ageing treatment at 150-190 DEG C is performed for 16-48 h to obtain the novel scandium-containing cast aluminum-lithium alloy. The obtained novel scandium-containing cast aluminum-lithium alloy has a uniform microscopic structure, stable performance, density lower than density of traditional aluminum alloys, higher elastic modulus and rigidity, and other mechanical properties, and is low in cost. Theultimate tensile strength of the novel scandium-containing cast aluminum-lithium alloy can be 450-490 MPa and the specific elongation is 4.5-7.0%.

The invention provides a cobalt-based high-temperature alloy wire which is prepared from the following chemical components in percent by mass: 0.06-0.12% of C, less than or equal to 0.3% of Si, 1-1.8%of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, 19.2-20% of Cr, 9.5-10.5% of Ni, 14.2-15.5% of W, less than or equal to 2.8% of Fe, less than or equal to 0.4% of other impurities and the balance Co. By adding 19.2-20% of Cr, the cobalt-based high-temperature alloy wire has excellent corrosion resistance, and a condition that high-temperature strength is decreased as aresult of a double phase area as the content of Cr is too high to promote generation of an epsilon-Co phase and a sigma phase is avoided. Elements such as massive Co, 14.2-15.5% of W and 19.2-20% ofCr and the like in the cobalt-based alloy can reduce stacking fault energy, so that the high-temperature strength of the alloy is improved. The content of W is controlled at 19.2-20%, so that it is ensured that a condition of prominent work hardening of the alloy, difficulty in cold processing and poor stability as the too high W content is avoided. As the cobalt-based high-temperature alloy wirecontains 9.5-10.5% of Ni, the tissue stability of the alloy is improved favorably, and precipitation of a Co7W6 phase is reduced. By adding 1.1-1.8% of Mn, the oxidation resistance of a Ni-Cr alloy isimproved effectively.

The invention discloses a fine grain strengthening method of an invar alloy thin strip. Invar alloy comprises the chemical ingredients of, in percentage by mass, 36% of Ni, 0.01-0.1% of C, 0.01-0.04% of Si, 0.01-0.05% of Mn, less than 0.01% of P, less than 0.01% of S and the balance Fe. A preparation process comprises the steps of smelting, casting, hot rolling, solid solution treatment, deep-cooling rolling, low-temperature recrystallization and annealing and the like. The average grain size of the prepared invar alloy thin strip is 3.9-6 microns, the strength of extension is 510-550 MPa, and the elongation percentage is 35-37%. According to the fine grain strengthening method, the ingredients of the invar alloy thin strip do not need to be changed, process control is simple, and the cost is low. By means of the fine grain strengthening method, the technical problems that the invar alloy thin strip produced through an existing process is thick and large in grain size and poor in mechanical property are solved, the cost is low, pollution is avoided, and it is beneficial to development of the high-strength invar alloy thin strip.

The invention discloses a manufacturing method of a silver tin oxide contact alloy material and a manufactured alloy thereof. The method comprises the following steps: 1.smelting: smelting the ingredients at the preset temperature and continuing to stir in the process of smelting; 2. casting the ingredients into a round spindle and lathing the surface of the round spindle; 3. carrying out hot rolling and then cold rolling on the round spindle and then rolling the round spindle into sheets; 4. carrying out oxygenation processing on the sheets in an internal oxidation furnace; 5. crushing the sheets and then carrying out high energy crushing processing on the crushed sheets; 6. carrying out hot extrusion to obtain a wire stock blank; 7. carrying out drawing processing and annealing treatment; and 8. taking the obtained material as the finished product. The alloy comprises the following components in percentage by weight: 7%-9% of Sn, 1.0%-3.0% of rare earth additive and the balance of Ag. The invention has the advantages of more simplified technique, easy implementation and excellent product performance.

The invention discloses austenitic heat-resistant steel and a preparation method thereof. The austenitic heat-resistant steel is prepared from components in percentage by weight as follows: 19%-25% of Ni, 20%-25% of Cr, 1.0%-6.0% of Co, less than or equal to 1.0% of Mn, 0.2%-0.8% of Nb, 0-0.5% of V, less than or equal to 1.0% of Si, 0.1%-0.3% of N, 0.04%-0.10% of C, 0.001%-0.003% of B, 0-0.04% of Ce, 0.01%-0.03% of P and the balance of Fe. The austenitic heat-resistant steel is high in strength and high in impact toughness; the MX phase, the Z(CrNbN) phase and M23C6 are main strengthening phases; and compared with the prior art, the austenitic heat-resistant steel is comparable in machinability and material cost but more excellent in structure stability, high-temperature strength and impact toughness and can be applied to manufacturing of super-heaters and re-heaters of ultra-supercritical thermal power generating units at 600 DEG C or above.

The invention discloses a Cu-Ni-Co-Fe-Si-Zr-Zn copper alloy material and a preparation method thereof. The copper alloy material is prepared from, by weight, 2.0%-3.0% of Ni, 0.3%-0.8% of Co, 0.3%-0.8% of Fe, 0.5%-1.1% of Si, 0.1%-0.2% of Zr, 0.1% 0.3% of Zn and the balance Cu. The preparation method of the copper alloy material comprises the following steps of alloy casting, homogenization treatment, hot rolling, solid solution treatment, deep cold rolling and pulse magnetic field aging treatment. The copper alloy material has the advantages of high yield strength, high tensile strength and conductivity, high elongation at break, and good comprehensive mechanical property and conductive performance. In addition, no toxic element is contained in the composition of the copper alloy material, the sources of raw materials are rich, the preparation process does not generate toxic compounds, and the harm to human bodies and the environment is small.

The invention discloses a nickel iron based welding wire for a boiler of a 700 DEG C ultra-supercritical power station, and belongs to the field of welding materials of ultra-supercritical power stations. The nickel iron based welding wire is prepared through the following components in percentage by mass: 23-30% of Fe, 19-24% of Cr, 1.8-2.4% of Al, 2.0-2.5% of Ti, 3.0-5.2% of Mo, less than 0.4% of W, not greater than 0.15% of Si, 0.4-0.8% of Mn, 0.04-0.07% of C, 0.001-0.003% of B, not greater than 0.02% of Zr, and the balance Ni, wherein Ti / Al is not less than 1; the sum of other impure elements is less than 0.1%. According to the nickel iron based welding wire, a weld joint can be microalloyed after welding through TIG (argon tungsten-arc welding), and thus the obtained weld joint meetsthe standard requirement; a weld joint area substrate formed by the nickel iron based welding wire is an austenite (gamma) phase of an irregular surface-core structure; the precipitate reinforcing phase is gamma' (Ni3(Al, Ti)) phase; and carbide phases are distributed among crystals.

The invention belongs to the field of alloys, in particular to a nitrogen-containing high-entropy alloy composite material and a preparation method thereof. The nitrogen-containing high-entropy alloycomposite material has mixed crystal tissues with coarse crystals and fine crystals alternately distributed. The preparation method comprises the following steps: I, preparing nitrogen-containing high-entropy pre-alloy powder, wherein metal elements in the nitrogen-containing high-entropy pre-alloy powder are selected from at least three of Fe, Co, Cr, Ni and Mn; and S2, shaping the nitrogen-containing high-entropy pre-alloy powder obtained in the S1 by means of the selective laser melting technique to obtain the high-entropy alloy. The preparation process is simple and controllable. The obtained product is fine and uniform in tissue, uniform in nitrogen distribution in a blank, also uniform in integral nitrogen distribution, good in mechanical property and good in corrosion resistance, thereby, providing necessary conditions for engineering applications of the nitrogen-containing high-entropy alloy.

The invention belongs to the field of metal additive manufacturing, and particularly discloses a crack-free nickel-based superalloy and a component design method and a preparation method thereof. The crack-free nickel-based superalloy comprises the following components in percentage by mass: 10.50%-11.00% of Mo, 24.50%-25.30% of Cr, 1.00%-1.50% of W, 4.00%-4.50% of Co, 10.00%-11.00% of Fe, 0.05%-0.08% of C, 0.60%-0.80% of Mn, 0-0.30% of Si and the balance of Ni. According to the nickel-based superalloy, the rapid solidification effect of the selective laser melting forming technology can be fully utilized, the strength of the GH3536 alloy can be remarkably improved, meanwhile, the microcrack defect of a traditional nickel-based superalloy in the selective laser melting forming process is remarkably reduced, and the mechanical property is excellent.

The invention discloses a high-forming nitrogen-containing austenitic stainless steel and a manufacturing method thereof. The composition of the steel comprises the following components of, by weight,0.001-0.05% of C, 2.50-3.80% of Si, 6.0-8.0% of Mn, 13.5-15.0% of Cr, 1.0-2.5% of Ni, 0.12-0.15% of N, 3.5-5.0% of Cu, less than or equal to 0.004% of S, 0.1-0.2% of V, 0.1-0.2% of Nb, and the balance Fe and inevitable impurities, wherein C+N is less than or equal to 0.18% , (V + Nb) / C is larger than or equal to 5, the content of Si multiplied by 5.59 mJ / m<2> is greater than or equal to 14 mJ / m<2>, Md30 / 50 is 40-70 DEG C, the average grain size is larger than or equal to 90 microns, and the hardness is less than or equal to HV180. According to the preparation method disclosed by the invention, the Ni is replaced with nitrogen alloying, and the Mn, the Cu and the like which obtain austenite structures are added; the Si and the like are added, so that lower stacking fault energy is remarkably reduced; the initial hardness of a material is reduced, and the temperature of the MD30 / 50 is controlled, so that the martensite phase changes slowly in the strain process; the erishen value is larger than or equal to 14.5, LDR is larger than or equal to 2.4, the requirements of complex forming is met, and the performance is close to 304 DDQ with high forming and high cost, so that the steel can be widely applied to industries such as electronics, instruments and apparatus, products and the like.

The invention provides a preparation method of a layered double-scale magnesium alloy, and belongs to the field of light metal material processing. The method comprises the following steps that isothermal heating is carried out on a magnesium alloy plate blank subjected to heating homogenization at 280-370 DEG C for 20-30 min, then the first pass of rolling deformation is immediately carried out to obtain a deformed plate, wherein the strain rate of rolling is 3.5-4.9s<-1>; and after annealing is carried out on the deformed plate, the second pass of rolling deformation is carried out at 280-340 DEG C, wherein the strain rate of rolling is 6.0-7.1s<-1>. According to the preparation method of the layered double-scale magnesium alloy, the high strain rate and gradient cooling double-pass rolling are adopted so that the high-strength toughened magnesium alloy material with the layered double-scale organizational structure can be obtained, the alternate layered distribution of the ultra-fine crystal layer and the micron crystal layer is achieved, and the strength and the plastic toughness of the magnesium alloy are improved.

The invention discloses a high-plasticity and high-strength high-entropy alloy and a preparation method thereof. The expression of the high-entropy alloy is NiaCobFecNbdVe, and a, b, c, d and e in the expression of the alloy respectively represent the atomic percentage content of each corresponding principal element and meet the following conditions that a is 40-30, b is 35-25, c is 35-25, d is 10-3, e is 10-3, and the sum of a, b, c, d and e is equal to 100. According to the high-entropy alloy, stacking fault energy of the alloy and the precipitation volume fraction of a nano precipitated phase are regulated and controlled by adjusting the content of each principal element, so that high plasticity and high strength are obtained. The yield strength of the high-entropy alloy reaches 1000 MPa, the tensile strength can reach 1300 MPa, and the ductility reaches up to 50%. The high-strength and high-plasticity high-entropy alloy can be used in the key high-technology fields of nuclear power, aviation, aerospace, navigation and the like.

The invention relates to a high-work-hardening magnesium alloy and a preparation method thereof, which belong to the field of metal materials. The alloy comprises the following chemical components in percentage by mass: 2.3-4.5 percent of tin, 0.1-3.85 percent of zinc and the balance of magnesium and unavoidable impurities; the magnesium alloy can further comprise one or more of 0.01-2.0 percent by mass of silicon, 0.01-3.0 percent of antimony, 0.01-3.0 percent by mass of tellurium, 0.01-1.5 percent by mass of strontium, 0.01-2.0 percent by mass of manganese and 0.01-3.0 percent by mass of rare earth elements; and the rare-earth elements include neodymium, lanthanum, yttrium and cerium. The preparation method comprises the following steps of: melting magnesium, adding tin and zinc, and adding additive elements and rare earth elements; and blowing, stirring, refining, removing slag, standing, directly pouring a melt into an ingot, and thermally extruding into a tubular product, a section or a plate. The alloy has the advantages of high-work-hardening capability, high plastic molding, simple and reliable preparation process, easiness for popularizing and application, and the like.

A Co—Ni-base alloy, being characterized in that a composition of the alloy comprises at least Co, Ni, Cr, Mo, W and Fe, and percentages by weight of the composition are from 25% to 45% of Co, from 25% to 40% of Ni, from 18% to 26% of Cr, from 3% to 11% of Mo, from 0.5% to 9% of W, wherein a sum of Mo and W is from 4% to 13% by weight, and from 1.1% to 5% of Fe.

The invention discloses a preparation method of a Cu-Ag alloy wire. The preparation method comprises the steps that (1) copper, silver and alloy elements are smelted to form an alloy, and then the alloy is forged. The alloy elements include iron, tin, indium, chromium, niobium, tungsten, molybdenum, titanium or zirconium; the mass fraction of the silver is 1-6%, and the mass fraction of the alloyelements is 0-1%; and (2) the forged alloy sample is subjected to rolling and wiredrawing at a low temperature. According to the prepared Cu-Ag alloy wire, since the microstructure of the copper is twin crystals and the microstructure of the silver is fine fibers, the strength of the Cu-Ag alloy wire is 500-1,490 MPa, and the electrical conductivity is 67-95% IACS. According to the preparation method, operation is simple, the cost is low, and the preparation method can be used for large-scale preparation of Cu-Ag alloy wires with high strength and high electrical conductivity.

The invention relates to a heat-resistant high-niobium austenite steel and a preparation method thereof. The heat-resistant high-niobium austenite steel has the advantages of reasonable component design, excellent strength and toughness at a high temperature good processing performance and good cost performance. The heat-resistant high-niobium austenite steel comprises, by weight, 19-25% of Ni, 20-25% of Cr, 1.0-6.0% of Co, 1.0% or less of Mn, 2-4% of Nb, 0-0.5% of V, 1.0% or less of Si, 0.1-0.3% of N, 0.04-0.15% of C, 0.001-0.003% of B, 0.001-0.003% of Zr, 0-0.04% of Ce, 0.01-0.03% of P, and the balance of Fe. The preparation method comprises the following steps: casting alloy ingots; carrying out homogenization and thermal deformation treatment on the alloy ingots; and carrying out solid solution heat treatment on the heat-deformed alloy at 1180-1240 DEG C for 5-45 min, and carrying out water cooling to room temperature.

The invention provides a nickel-based alloy, a preparation method and an article thereof. The nickel-based alloy is composed of the following elements of, 5.25wt%-6.2wt% of aluminum; 5.0wt%-7.0wt% ofchromium; 5.0wt%-7.0wt% of cobalt; 0.5wt%-2.5wt% of molybdenum; 7.0wt%-9.0wt% of tungsten; 0.0 wt%-1.0 wt% of titanium; 7.0 wt%-9. 0wt% of tantalum; 0.0wt% -0.25 wt% of hafnium; 0.0wt%-0.05wt% of carbon; 0.0wt%-0.01 wt% of boron, and the balance nickel. By adding the elements and adjusting the content of the elements, the obtained nickel-based alloy is in the alloy density, the alloy cost, the structure stability, the high-temperature strength and the like are well balanced, and the comprehensive performance is excellent.

The invention discloses a manufacturing method of a silver tin oxide contact alloy material and a manufactured alloy thereof. The method comprises the following steps: 1.smelting: smelting the ingredients at the preset temperature and continuing to stir in the process of smelting; 2. casting the ingredients into a round spindle and lathing the surface of the round spindle; 3. carrying out hot rolling and then cold rolling on the round spindle and then rolling the round spindle into sheets; 4. carrying out oxygenation processing on the sheets in an internal oxidation furnace; 5. crushing the sheets and then carrying out high energy crushing processing on the crushed sheets; 6. carrying out hot extrusion to obtain a wire stock blank; 7. carrying out drawing processing and annealing treatment; and 8. taking the obtained material as the finished product. The alloy comprises the following components in percentage by weight: 7%-9% of Sn, 1.0%-3.0% of rare earth additive and the balance of Ag. The invention has the advantages of more simplified technique, easy implementation and excellent product performance.

The invention discloses a high performance high-entropy alloy and a processing method thereof. The mother alloy of the high-entropy alloy is (Fe40.32Mn39.66Co9.38Cr10.64)99-xMo1Cx. The alloy is proportioned according to the nominal compositions and is smelted, wherein the content x of doped carbon is greater than zero but less than or equal to 1wt%. The processing method comprises the following steps: S1, proportioning the mother alloy (Fe40.32Mn39.66Co9.38Cr10.64)99-xMo1Cx according to the nominal compositions, wherein x is greater than zero but less than or equal to 1wt%; and S2, putting each component of the mother alloy into an induction furnace to be smelted to obtain the alloy as cast condition, the grain size of which is between about 100[mu]m and 500[mu]m. The high-entropy alloy disclosed by the invention effectively reduces the stacking fault energy of the material, and is easier to induce twin crystals; the relationship between strength and plasticity is coordinated, and thealloy is low in cost and has a high economical benefit.

The invention discloses a low-temperature, high-strength and high-toughness high-entropy alloy and machining method thereof. The molecular formula of a mother alloy of the high-entropy alloy is (Fe40Mn40Co10Cr10)100-x-yCxTiy, wherein, x is carbon content, and x is larger than 0.6 wt% and smaller than or equal to 0.8 wt%; y is titanium content, and y is greater than 1.4 wt% and less than or equal to 2.4 wt%; According to the percentage composition of element atoms, an alloy matrix Fe40Mn40Co10Cr10 of the high-entropy alloy comprises Fe of 35-45%; Mn of 35-45%; Co of 5-15%; and Cr of 5-15%. According to the low-temperature, high-strength high-toughness high-entropy alloy, a certain content of carbon element and titanium element are introduced into the Fe40Mn40Co10Cr10 alloy to form an interstitial solid solution with a matrix, so that on one hand, the stacking fault energy of a material can be effectively reduced, and twinning can be induced under a low-temperature condition, and on theother hand, the carbon element and the titanium element can provide additional strength increment for the matrix through solid solution and precipitation of carbide and titanium compounds, so that thelow-temperature performance of the material is effectively improved; and the titanium element is used as a good interstitial atom and the titanium compound is used as an effective precipitation strengthening phase, so that the performance of the material at low temperature can be greatly improved.

The invention provides a casting magnesium alloy comprising the components: 0.8-2wt% of Zn, 0.2-0.6wt% of Zr, 0.05-0.55wt% of RE and the balance of Mg and unavoidable impurities, wherein RE is Yb or Y. An Mg-Zn-Zr casting magnesium alloy is modified by Yb or Y with a relatively large atomic radius in a heavy rare earth element, and due to the addition of trace Yb or Y, not only is a relatively high solid solution strengthening effect generated, but also the stacking fault energy of the magnesium alloy can also be reduced; and the reduction of the stacking fault energy is beneficial to the activation of nonbasal slip and the promotion of formation of twin crystals and stacking faults, and furthermore, the plasticity and work hardening capacity of the magnesium alloy are improved. Therefore, the casting magnesium alloy obtained under the combined actions of various components and component contents has relatively high plasticity. The invention also provides a preparation method of the casting magnesium alloy.

The invention relates to high-entropy alloy powder, a high-resistance coating, as well as a preparation method and application thereof. The high-entropy alloy powder is prepared from the following components in percentage by mass: 17 to 25 percent of nickel, 14 to 25 percent of cobalt, 15 to 20 percent of chromium, 13 to 20 percent of manganese, and the balance iron. The high-entropy alloy powderis applied to the preparation of the high-resistance heating coating. According to the high-resistance coating material provided by the invention, the coating obtains a single-phase structure, the resistance of the coating is improved at the same time, the heating efficiency is improved, and the service reliability is ensured at the same time, so that the high-entropy alloy powder and the high-resistance coating have broad application prospects.

The invention provides a nickel base alloy, a preparation method of the nickel base alloy and manufactured goods. The nickel base alloy is prepared from the following elements in percentage by weight:5.5%-6.5% of aluminum, 5.0%-7.0% of chrome, 5.0%-7.0% of cobalt, 5.5%-7.5% of molybdenum, 3.0%-5.0% of tungsten, 0.0%-1.0% of titanium, 6.0%-8.0% of tantalum, 0.0%-0.25% of hafnium, 0.0%-0.05% of carbon, 0.0%-0.01% of boron, and the balance of nickel. According to the nickel base alloy, the preparation method of the nickel base alloy and the manufactured goods, by adding the elements and adjusting the content of the elements, the obtained nickel base alloy realizes good balance in aspects such as alloy density, alloy cost, structure stability and high-temperature strength, and has excellent comprehensive performance.

The invention relates to a deformed high-temperature alloy and a manufacturing method thereof, and relates to the technical field of metal structure materials. According to the mainly adopted technical scheme, the deformed high-temperature alloy comprises the following components in percentage by weight: 20-35% of Co, 8-11% of Cr, 5.2-6% of Ti, 1.8-4.0% of Al, 4-6% of W, 2-4% of Mo, 0-4% of Ta, less than 0.05% of C, less than 0.1% of Zr and the balance of Ni. The stacking fault energy of the deformed high-temperature alloy is less than 33mJ / m < 2 >; and the volume fraction of the strengtheningphase gamma' in the deformed high-temperature alloy is 40-48%. The invention is mainly used for designing the deformed high-temperature alloy which has excellent strength at a use temperature and hasgood plasticity in a hot working temperature interval; and the deformed high-temperature alloy is mainly suitable for parts used under high temperature and high stress, such as turbine discs of aero-engines.

The invention relates to high-strength high-plasticity shape memory steel of which the recovery stress is higher than 500 MPa and the recovery strain is higher than 4%, and a preparation method thereof. Alloy comprises the components of, by mass percent, 18-24% of Mn, 4.5-6.5% of Si, 7-11% of Cr, 4-6% of Ni, 0.08-1.5% of V, 0.02-0.3% of C and the balance Fe. The preparation method of the alloy comprises the steps of vacuum induction smelting and heat treatment, and a preparation technology is simple and controllable. According to the shape memory steel obtained by optimizing the components ofthe alloy, under the condition free of heat mechanical treatment, the recovery stress is higher than 500 MPa, the recovery strain is higher than 4%, the strength is higher than 700 MPa, the elongationpercentage is larger than 10%, and the excellent shape memory effect and mechanical property are embodied.

The invention provides a high-damping high-strength high-entropy alloy material with high corrosion resistance and a preparation method of the high-damping high-strength high-entropy alloy material. The high-entropy alloy material is prepared from the following metal raw materials in percentage by atomic number: 20% of manganese, 15% of chromium, 5-20% of cobalt and the balance of iron. The preparation method of the high-entropy alloy material comprises the following steps that manganese particles, chromium particles, cobalt particles and iron particles are weighted according to the atomic percentage content of manganese, chromium, cobalt and iron in the metal raw materials of the high-entropy alloy material; the weighed manganese particles, chromium particles, cobalt particles and iron particles are put into a vacuum induction furnace, the vacuum induction furnace is vacuumized, repeated overturning smelting is conducted under protective gas, and alloy liquid is obtained; the obtained alloy liquid is subjected to heat preservation treatment in the vacuum induction furnace; and the alloy liquid subjected to heat preservation is cast to obtain an alloy ingot. The high-entropy alloy material has excellent damping property, mechanical property and corrosion resistance at the same time.

The invention discloses a nickel-based alloy and a preparation method and an application thereof, and relates to the technical field of corrosion-resistant materials to solve the problem of poor corrosion resistance of supercritical equipment caused by an existing Inconel-625 material or Hastelloy C-276 material in an oxidative medium with a plurality of ions. The nickel-based alloy comprises the following elements in percentage by mass: 15%-28% of Cr, 4.1%-10% of W, 0.5%-4% of Mo, 0.8%-2.1% Al, 0.3-0.8 Ti, 6%-17% of Fe, greater than 0 and not greater than 0.03% of C, 0-0.5% of a microelement and the balance of Ni; and the preparation method of the nickel-based alloy comprises the following steps: mixing and melting Ni, Cr, Mo and Fe in a vacuum condition until completely melting, and then refining; adding Ti and the microelement, stirring evenly, and then desulfurizing at 1385-1395 DEG C; and finally casting and molding to obtain the nickel-based alloy. The nickel-based alloy can be applied to the supercritical equipment as a corrosion-resistant material.

The invention relates to high-niobium austenite heat-resistant steel having high tissue stability under 700 DEG C and a preparation method of the high-niobium austenite heat-resistant steel. The high-niobium austenite heat-resistant steel disclosed by the invention is reasonable in ingredient design, good in processing performance and high in cost performance ratio; under 700 DEG C, the tissue deposition phase in a long-term prescription is stable, and a sigma phase is not found, so that the situation that the alloy is subjected to embrittlement in the high-temperature service process caused by the sigma phase is avoided; and dispersion strengthening of secondary MX phase and Z phase is performed. The high-niobium austenite heat-resistant steel comprises the following components in percentage by mass of 18-22% of Cr, 17-22% of Ni, 1-2% of Nb, 0.01-0.08% of C, 0.01-0.15% of N, 0.1-1% of Co, Si, Mn, B and Zr of which the total quantity is greater than or equal to 0.4% and smaller than orequal to 1%, and the balance Fe. The preparation method comprises the following steps of performing melting to obtain alloy ingots; performing uniform annealing treatment on the alloy ingots; and performing solution treatment at 1200-1280 DEG C on the alloy ingots after uniform annealing for 20-120min.