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Method for improving room temperature plasticity of refractory high-entropy alloy

A high-entropy alloy and room temperature technology, which is applied in the field of smelting refractory high-entropy alloys to improve their room temperature plasticity, can solve the problems of limiting alloy cold-state manufacturability, low deformation limit, and poor room-temperature plasticity, so as to improve cold-state plastic deformation The effect of limit, room temperature compression plasticity improvement, and microstructure refinement

Active Publication Date: 2020-02-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the refractory high-entropy alloys that have been developed and researched have poor room temperature plasticity, low deformation limit, and high deformation resistance, which greatly limits the cold processability of the alloy; Low, the high temperature deformation resistance will also be greater, and the deformation strain rate will be low
These will greatly hinder the engineering application of refractory high-entropy alloys as high-temperature structural materials.

Method used

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  • Method for improving room temperature plasticity of refractory high-entropy alloy
  • Method for improving room temperature plasticity of refractory high-entropy alloy
  • Method for improving room temperature plasticity of refractory high-entropy alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1 Preparation of High Room Temperature Plastic Refractory High Entropy Alloy (TiZrNbHf0.5Mo0.5)

[0019] Raw material preparation

[0020] The alloy raw materials used in this embodiment are Nb, Mo, Ti, Zr, Hf refractory metal elements with a purity above 99%. All materials are blocks, and the oxide skin on the surface of the material is removed by grinding with sandpaper or grinding wheel, and placed in industrial ethanol to clean with ultrasonic vibration, and then according to the atomic ratio of the constituent elements Nb:Mo:Ti:Zr:Hf=1:0.5:1 :1:0.5, accurate weighing.

[0021] alloy melting

[0022] The invention uses a vacuum non-consumable electric arc furnace to smelt the alloy. Put the proportioned and weighed raw materials in the water-cooled copper crucible according to the melting point of the elements from low to high, and vacuumize the furnace cavity to 6×10 -3 Pa, hydrogen and argon with a purity of 99.999% are introduced into the melting cham...

Embodiment 4

[0028] Embodiment 4 characterizes:

[0029] Evaluation of Compressibility of Alloys at Room Temperature by Liquid Hydrogen Substitution

[0030] (1) Compression test at room temperature

[0031] Adopt wire cutting to cut respectively on the middle part of the alloy button ingot prepared by smelting of comparative example 1 and embodiment 1 For the cylindrical sample, use sandpaper to polish the upper and lower end faces and side surfaces of the cylindrical sample. The room temperature compression performance test was carried out on the universal electronic testing machine Instron-5569, and the compression rate was 1×10 -3 the s -1 , the compressive stress-strain curve of the alloy obtained from the test is as follows figure 1 Shown (Unhydrogenated represents comparative example 1, and Hydrogenated represents embodiment 1). Compared with the alloy prepared under the condition of pure argon, it is found that the room temperature plasticity of the alloy TiZrNbHf0.5Mo0.5 pre...

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Abstract

The invention discloses a method for improving the room temperature plasticity of refractory high-entropy alloy, and relates to the field of metal materials and preparation thereof. According to the specific scheme, the method includes the steps that 1) all component materials required for smelting the alloy are obtained and purified; 2) the materials obtained in the step 1) are placed in a non-consumable vacuum arc furnace, and hydrogen and argon are introduced after vacuumizing; and 3) smelting is carried out to obtain a room temperature plastic alloy material. The room temperature compression plasticity of the alloy obtained after melt hydrogenation is remarkably improved, the yield strength of the alloy is not reduced, and the microstructure is refined. The method solves the problems of poor room temperature plasticity and poor cold deformation capability of the refractory high-entropy alloy, improves the cold state plastic deformation limit of the alloy, realizes strengthening andtoughening of the refractory high-entropy alloy, and plays an important role in promoting engineering application of the alloy.

Description

technical field [0001] The invention relates to the field of metal materials and their preparation, in particular to a method for melting refractory high-entropy alloys in a hydrogen reducing atmosphere so as to improve their plasticity at room temperature. Background technique [0002] With the continuous development of the aerospace field, the demand for high-temperature structural materials is increasing, and the requirements for material performance are also increasing. The alloy design concept of multi-principal high-entropy alloys provides a new idea for the development of high-temperature structural materials with excellent performance. According to the design ideas of high-entropy alloys, researchers at home and abroad have prepared a series of refractory high-entropy alloys, and the constituent elements of these alloy systems are all refractory metal elements. With reasonable element selection, these alloys can form simple phase compositions and exhibit excellent h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C30/00
CPCC22C1/02C22C30/00
Inventor 王亮刘小东苏彦庆陈瑞润郭景杰
Owner HARBIN INST OF TECH
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