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Multi-principal-component medium-entropy alloy and preparation method thereof

An entropy alloy and multi-principal technology, which is applied to the multi-principal entropy alloy and its preparation field, can solve the problems of complex smelting process and high cost, and achieve the effects of simplified process, low cost and favorable production.

Active Publication Date: 2019-04-09
JIANGSU UNIV OF SCI & TECH
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  • Claims
  • Application Information

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Problems solved by technology

Patents (CN201610759867.4 and CN 201610758896.9) respectively announced TiCuAlCrMoNi and TiCuAlCrMoNb high-entropy alloys. Both alloys have high yield strength, tensile strength and certain elongation, and have excellent corrosion resistance. However, the above-mentioned high-entropy alloys There is a common problem, that is, the alloy contains a variety of refractory metals, the melting process is complicated, and the cost is high

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  • Multi-principal-component medium-entropy alloy and preparation method thereof
  • Multi-principal-component medium-entropy alloy and preparation method thereof
  • Multi-principal-component medium-entropy alloy and preparation method thereof

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Embodiment

[0028] 1. Fe of the present invention 25 Ni 25 co 50-x Mo x The preparation process of medium entropy alloy is as follows:

[0029] Step 1: Precisely calculate and weigh the high-purity metal raw material (≥99.95%) according to the mass percentage, for use in smelting alloys;

[0030] Step 2: Using WK ​​type non-consumable vacuum electric arc furnace, put the weighed elemental raw materials into the water-cooled copper mold melting pool in the vacuum electric arc furnace, place oxygen-absorbing titanium in the middle of the crucible, then close the furnace door, and tighten the knob;

[0031] Step 3: Vacuum the electric arc furnace, when the vacuum degree reaches 5×10 -3 After Pa, fill the furnace with argon gas with a purity of 99.99wt% to normal pressure, so as to prevent the alloy from being oxidized and reduce volatilization during alloy melting. In this way, "vacuumize-fill with argon" three times can be smelted. Melting at 400A current for about 30 seconds, turning...

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Abstract

The invention relates to a multi-principal-component medium-entropy alloy and a preparation method thereof. The components of the multi-principal-component medium-entropy alloy are Fe25Ni25Co(50-x)Mox(x being greater than or equal to 0 and smaller than or equal to 50) in atomic percentage. The medium-entropy alloy with the components of Fe25Ni25Co25Mo25 has optical comprehensive mechanical properties: hardness being 411HV, yield strength being 1520 MPa, compressive strength being 2056MPa, and plasticity being 31%. The medium-entropy alloy disclosed by the invention is prepared by an electric-arc smelting method. The preparation method is simplified in process, is relatively low in difficulty and is relatively low in cost.

Description

technical field [0001] The invention relates to the field of metal materials and their preparation, in particular to a multi-principal medium-entropy alloy and a preparation method thereof. technical background [0002] In thermodynamics, the entropy value represents the degree of chaos of the system. The greater the entropy value, the greater the degree of chaos of the system. When the entropy reaches the maximum value, the system tends to be stable and reaches equilibrium. New multi-principal metal materials with higher system △S mix The value is different from traditional alloys. Traditional alloys are dominated by one element, and their mixing entropy is less than 0.693R. (R is the gas constant R=8.314J / mol K) is a low-entropy alloy, an alloy composed of 2 to 4 elements , whose mixing entropy is between 0.693R and 1.61R, it is called a medium entropy alloy. Alloys composed of 5 or more elements, whose mixing entropy is above 1.61R, are called high-entropy alloys. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02
CPCC22C1/02C22C30/00
Inventor 刘宁范佳承陈晨彭振杜文栋王小京
Owner JIANGSU UNIV OF SCI & TECH
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