A composite modification method of high-entropy alloy extruded pier

A high-entropy alloy and modification technology, applied in the field of plastic modification, can solve the problems of high-entropy alloy lattice distortion, easy formation of cracks, hindering the application of plastic processing forging modification process, etc. The effect of promoting mass use

Inactive Publication Date: 2019-07-16
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, due to the serious lattice distortion of high-entropy alloys, cracks are easy to form during forging, which greatly hinders the application of plastic processing forging modification technology.

Method used

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  • A composite modification method of high-entropy alloy extruded pier

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Embodiment Construction

[0019] Taking AlCrFeNiCuMu as an example, this embodiment is an AlCrFeNiCuMu with uniform structure and significantly improved mechanical properties prepared by pier extrusion composite technology. 0.5 The method for the high-entropy alloy ingot billet is specifically completed according to the following steps:

[0020] (1) Prepare high entropy alloy: AlCrFeNiCuMu 0.5 Ingot: the selected composition is AlCrFeNiCuMu 0.5 In the ingot of the high-entropy alloy, the molar ratios of the five elements are Al:Cr:Fe:Ni:Cu:Mu=1:1:1:1:1:0.5.

[0021] (2) Homogenization heat treatment: AlCrFeNiCuMu selected in step (1) 0.5 The high-entropy alloy ingot is subjected to homogenization heat treatment. The temperature of the homogenization heat treatment is 1000°C-1100°C, and then the heat preservation treatment is carried out according to the thickness of the ingot 0.8-1min / mm. The heat preservation time of the homogenization heat treatment is 12h-100h, and the internal structure is obtain...

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Abstract

The invention relates to a hot working and grain refinement plasticity modification technology dedicated to high-entropy alloy material and a method to prepare high-performance high-entropy alloy material. The invention aims to provide an extruding and mounding composite plasticity modification method dedicated to the service requirement of high-entropy alloy. Aiming at the hot-working characteristic of high-entropy alloy, the method of first mounding and then extruding, mounding after extruding and repeated mounding and extruding is adopted, so that the stress state in the high-entropy alloymaterial during the deformation process is effectively controlled, the three-directional compression stress is increased, generation and expansion of microcracks evoked by lattice deformation are effectively restrained, the grain is refined, the comprehensive mechanical performance is improved, and effective modification of the high-entropy alloy is realized. The extruding and mounding composite technology is easy to realize and low in cost; high-entropy alloy ingot blank material with uniform and excellent structure property can be obtained, and the service capacity is effectively improved; and with adoption of the method, large-scale application of the high-entropy alloy is promoted, and the mechanical performance of the high-entropy alloy can be effectively improved and controlled.

Description

technical field [0001] The invention relates to a plastic modification method specially aimed at thermal processing and grain refinement of high-entropy alloy materials. Background technique [0002] High-entropy alloys are emerging materials that have attracted widespread attention in recent years. They have good mechanical, physical and chemical properties such as high hardness, high strength, high wear resistance and high corrosion resistance, and have broad application prospects in modern engineering. However, due to the serious lattice distortion of high-entropy alloys, the as-cast structure is a typical dendrite structure, and the plasticity is low under high-temperature deformation conditions. At the same time, due to the existence of casting defects, it is easy to crack after high-temperature forging. It cannot be fully utilized in the application, which greatly limits the large-scale engineering application of high-entropy alloys. In order to eliminate casting defe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/00C22C30/02
CPCC22C30/02C22F1/00
Inventor 李洪洋曾申涛张晶宋明龙蔡艾君
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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