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Method for improving toughness of boracic high-entropy alloy by adding rare earth

A high-entropy alloy, strong toughness technology, applied in the field of alloys, can solve the problems of reducing solid solution strengthening effect and alloy toughness, and achieve the effect of promoting toughening effect, wide application range, and improving comprehensive mechanical properties

Active Publication Date: 2015-03-25
江苏康柏斯机械科技有限公司
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Problems solved by technology

However, due to the strong binding energy between non-metal and metal elements, the interstitial compounds formed by the two have high thermodynamic enthalpy of formation, and the addition of small atomic boron elements to high-entropy alloys can easily lead to the precipitation of a large number of coarse and brittle borides after solidification of the alloy. Reduce the solid solution strengthening effect and the toughness of the alloy

Method used

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  • Method for improving toughness of boracic high-entropy alloy by adding rare earth
  • Method for improving toughness of boracic high-entropy alloy by adding rare earth
  • Method for improving toughness of boracic high-entropy alloy by adding rare earth

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Embodiment 1

[0015] Fe, Co, Ni, Cr, Cu, Mn, Mo and other metal elements are taken, and different contents of small atomic boron elements and rare earth elements yttrium or cerium are added to the alloy, and the high-entropy alloy components are respectively labeled 1 to 3 groups A total of 9 components are used to compare the effects of the joint addition of boron and rare earth elements on the hardness and brittleness of high-entropy alloys. The component numbers are shown in Table 1. Put the prepared components of each group in the water-cooled copper mold of the vacuum electric arc furnace melting furnace, and then cover the furnace cover. First, the vacuum is pumped to about 0.01 atmospheric pressure, and then pure argon is injected, and then the pumping and restarting operations are repeated 1~ Start smelting after 2 times. After each smelting and solidification is completed, the alloy in the copper mold is turned over and then arc-dissolved, and this is repeated several times until a...

Embodiment 2

[0019] Fe, Co, Ni, Cr, Cu, Mn, Ti, Mo and other metal element powders are taken, and different contents of small atomic boron and rare earth element yttrium, cerium and other powders are added to the alloy, and the particle size of the powder is 50-300 μm. According to the composition shown in Table 2, the composition of the boron-containing high-entropy alloy coating was configured and labeled 4 to 6 groups, a total of 9 components were used to compare the effects of the combined addition of boron and rare earth elements on the hardness and brittleness of the laser cladding high-entropy alloy coating. Laser cladding process measures: firstly, the iron-based or nickel-based or cobalt-based substrate materials are pretreated for surface derusting, decontamination, preheating, etc.; then semiconductor or CO 2 The laser adopts the reverse synchronous or coaxial powder feeding method, cladding the configured high-entropy alloy powder numbered 4 to 6 groups; at the same time, the la...

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Abstract

The invention discloses a method for improving the toughness of a boracic high-entropy alloy by adding rare earth, belonging to the technical field of alloy materials. According to the component design idea of the invention, a boron element with the mole fraction of 0.1-8% is added into a high-entropy alloy consisting of five or more than five elements, and meanwhile 0.1-4% of a rare earth element such as Y or Ce is added together. Due to addition of the rare earth elements, the gap solid solution reinforcement effect of the small atom boron element in the high-entropy alloy is improved, and the separation content, the morphology and the distribution of rigid boride hard phase are improved, so that the strength and the toughness of the boracic high-entropy alloy are synchronously improved.

Description

technical field [0001] The invention belongs to the field of alloy technology, and specifically relates to a method for adding rare earths to improve the solid solution strengthening effect of small atomic boron interstitials in boron-containing high-entropy alloys, improve the form and distribution of boride precipitation, and simultaneously improve the strength and toughness of boron-containing high-entropy alloys. Background technique [0002] High-entropy alloys are one of the hot spots in the research of new metal structural materials in recent years. The main alloy components are composed of 5 to 11 main elements in equimolar ratios or near equimolar ratios, which can combine good hardness, strength and corrosion resistance. , Oxidation resistance and high temperature heat resistance. The main strengthening methods reported for high-entropy alloys generally increase the content of large-atom alloying elements such as Al, Ti, and Mo to increase the lattice distortion of...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22C1/02
Inventor 张晖何宜柱李明喜
Owner 江苏康柏斯机械科技有限公司
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