Temperature-controllable near-isothermal plastic processing technology for high-entropy alloys

A high-entropy alloy and plastic processing technology, applied in the field of warm plastic processing, can solve the problems of easy cracking, high temperature dependence of deformation, high-entropy alloy lattice distortion, etc., to refine grains, improve mechanical properties and cost. low effect

Inactive Publication Date: 2016-06-08
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
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  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to provide a temperature-controlled near-isothermal plastic modification method for problems such as serious lattice distortion of high-entropy alloys, high dependence on deformation temperature, and easy cracking in the plastic modification process.

Method used

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  • Temperature-controllable near-isothermal plastic processing technology for high-entropy alloys

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Example 1: Al 1.5 CoCrFeNi as-cast high-entropy alloy processing modification, it combines plasticity modification of the present invention The specific embodiment is as follows:

[0026] 1. Al through a heating furnace 1.5 The CoCrFeNi ingot was heated to 1150°C and kept for 30 minutes to homogenize the structure. Al is removed from the furnace 1.5 The CoCrFeNi cast ingot is placed between the lower die 6 and the upper punch 2 with heating and heat preservation while suppressing convective radiation heat dissipation by manipulators or clamps, and the ingot is clamped by the left and right clamping mechanisms 5, while relying on The sensor 6 on the clamping mechanism collects the temperature gradient distribution of the ingot along the height direction in real time.

[0027] 2. Combining the temperature gradient distribution collected by the clamping mechanism 5 and the Al 1.5 The crystal structure of CoCrFeNi high-entropy alloy (BCC) and the crystal lattice distort...

Embodiment 2

[0033] Example 2: CoCrFeNiTi 0.5 As-cast high-entropy alloy processing modification, it is combined with the plastic modification of the present invention The specific embodiment is as follows:

[0034] 1. Put CoCrFeNiTi into 0.5 The ingot was heated to 1100°C and kept for 30 minutes to homogenize the structure. Take out CoCrFeNiTi from the furnace 0.5 The as-cast ingot is placed between the lower die 6 and the upper punch 2 with heating and heat preservation and can suppress convection radiation heat dissipation through a manipulator or clamps, and the ingot is clamped by the left and right clamping mechanisms 5, while relying on the clamp The sensor 6 on the holding mechanism collects the temperature gradient distribution of the ingot along the height direction in real time.

[0035] 2. Combining the temperature gradient distribution collected by the clamping mechanism 5 and the CoCrFeNiTi 0.5 The high-entropy alloy (FCC) crystal structure and the lattice distortion of t...

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Abstract

The invention provides a temperature-controllable near-isothermal plastic processing technology for high-entropy alloys. The technology is characterized in that by adopting temperature control molds, the temperature data of a high-entropy alloy ingot in the molds are collected in real time through a thermocouple, the real-time temperature gradient curve of materials in the deformation direction is obtained, according to the microcosmic crystal structure features of the materials, the temperature of the molds is regulated and controlled on line for controlling the deformation temperature conditions of the materials, and therefore the materials can be formed on the near-isothermal condition and on the condition of keeping a good temperature gradient in the height direction. The high-entropy alloys are processed on the near-isothermal condition, the deformation temperature can be controlled to be within the optimum temperature range, and the sufficiency and the controllability of microstructure conversion can be guaranteed. Processing is carried out on the condition with the good deformation temperature gradient, and the deformation uniformity of each part of the materials is guaranteed. Through near-isothermal control, initiation and propagation of micro-cracks can be restrained, grains can be refined, precise control over microstructure conversion of the high-entropy alloy materials can be realized, and the mechanical properties of the materials can be improved.

Description

technical field [0001] The invention belongs to a technical method for processing and modifying metal materials through plastic forming, and mainly aims at a temperature-controllable near-isothermal plastic processing method for high-entropy alloys with severe lattice distortion and easy cracking during deformation. Background technique [0002] Metal materials are an important basis for social development and play an important role in the development of human society. Since the Bronze Age, metal materials have gradually entered human social life, constantly meeting the different needs of human society for materials. The use of early metal materials was mostly pure metals. With the advancement of society and the improvement of human knowledge and scientific research, humans have developed a large number of alloy systems, including steel materials, copper alloys, aluminum alloys, and magnesium alloys. The common feature of these alloys is that one metal element is used as th...

Claims

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Application Information

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IPC IPC(8): C22F1/00
CPCC22F1/00
Inventor 李洪洋俞治平吕娜张妍婧
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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