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Method for preparing Al0.5CoCrFeNi high-entropy alloy

A technology of high-entropy alloys and master alloys, which is applied in the field of preparation of high-entropy alloy materials, can solve the problems of inability to prepare large-volume high-entropy alloys, and achieve the effects of similar grain size, reduced volatilization, and guaranteed composition uniformity

Active Publication Date: 2017-05-31
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiency in the prior art that cannot prepare large-volume high-entropy alloys, the present invention proposes a method for preparing large-volume Al 0.5 CoCrFeNi High Entropy Alloy Method

Method used

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  • Method for preparing Al0.5CoCrFeNi high-entropy alloy
  • Method for preparing Al0.5CoCrFeNi high-entropy alloy
  • Method for preparing Al0.5CoCrFeNi high-entropy alloy

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Embodiment 1

[0030] This embodiment is a kind of FeCoCr and Ni that adopt master alloy 2 Al as raw material to prepare Al 0.5 CoCrFeNi high-entropy alloy method, the Al 0.5 The atomic molar ratio of CoCrFeNi high-entropy alloy is Al 0.5 CoCrFeNi.

[0031] The specific implementation steps are as follows:

[0032] Step 1, surface treatment: for FeCoCr and Ni 2 Al surface grinding treatment. Specifically, bulk FeCoCr with a purity of 99.9wt.% and bulk Ni with a purity of 99.9wt.% 2 Al surface is polished clean. The polished FeCoCr and Ni 2 Al is placed in the acetone solution and ultrasonically cleaned for 10 minutes and then placed in a drying oven to dry, so that the FeCoCr and Ni 2 The surface of Al exhibits metallic luster. According to the prepared Al 0.5 The atomic molar ratio of CoCrFeNi high-entropy alloy is determined by the FeCoCr and Ni 2 The mass ratio of Al is 2.3105:1. Weigh FeCoCr and Ni 2 Al. In the present embodiment, the FeCoCr that weighs is 12kg, Ni 2 Al is...

Embodiment 2

[0042] This embodiment is a method for preparing bulk Al 0.5 The method of CoCrFeNi high-entropy alloy, concrete implementation steps are as follows:

[0043] Step 1, surface treatment: for FeCoCr and Ni 2 Al surface grinding treatment. Specifically, bulk FeCoCr with a purity of 99.9wt.% and bulk Ni with a purity of 99.9wt.% 2 Al surface is polished clean. The polished FeCoCr and Ni 2 Al is placed in the acetone solution and ultrasonically cleaned for 20min and then placed in a drying oven to dry, so that the FeCoCr and Ni 2 The surface of Al exhibits metallic luster. According to the prepared Al 0.5 The atomic molar ratio of CoCrFeNi high-entropy alloy is determined by the FeCoCr and Ni 2 The mass ratio of Al is 2.3105:1. Weigh FeCoCr and Ni 2 Al. In the present embodiment, the FeCoCr that weighs is 15kg, Ni 2 Al is 6.492kg.

[0044] Step 2, furnace body preheating: add any FeCoCr or Ni into the crucible of the vacuum induction melting furnace 2 Al as a preheater...

Embodiment 3

[0053] This embodiment is a method for preparing bulk Al 0.5 The method of CoCrFeNi high-entropy alloy, concrete implementation steps are as follows:

[0054] Step 1, surface treatment: for FeCoCr and Ni 2 Al surface grinding treatment. Specifically, bulk FeCoCr with a purity of 99.9wt.% and bulk Ni with a purity of 99.9wt.% 2 Al surface is polished clean. The polished FeCoCr and Ni 2 Al is placed in the acetone solution and ultrasonically cleaned for 15 minutes and then placed in a drying oven to dry, so that the FeCoCr and Ni 2 The surface of Al exhibits metallic luster. According to the prepared Al 0.5 The atomic molar ratio of CoCrFeNi high-entropy alloy is determined by the FeCoCr and Ni 2 The mass ratio of Al is 2.3105:1. Weigh FeCoCr and Ni 2 Al. In the present embodiment, the FeCoCr that weighs is 12kg, Ni 2 Al is 5.194kg.

[0055] Step 2, furnace body preheating: add any FeCoCr or Ni into the crucible of the vacuum induction melting furnace 2 Al as a preh...

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Abstract

The invention discloses a method for preparing an Al0.5CoCrFeNi high-entropy alloy. An intermediate alloy serves as a raw material, and volatilization of a low-melting-point element Al in the smelting process is greatly reduced. Meanwhile, a vacuum induction heating device is adopted, the electromagnetic stirring effect of the induction heating device is utilized, and therefore the component uniformity of a cast ingot is guaranteed. According to the method, the melting point difference between the lowest-melting-point metal Al and the highest-melting-point metal Cr is indirectly reduced, the problem of excessive volatilization of the low-melting-point Al simple substance in the smelting process is solved, and the component uniformity of the multi-element high-entropy alloy is guaranteed through the electromagnetic stirring effect existing in induction heating. Through reasonable designing of the atmosphere, the air pressure, the die preheating temperature, the smelting temperature, the heat preservation time, the casting speed and other parameters in the smelting process, a large Al0.5CoCrFeNi high-entropy alloy cast ingot is successfully prepared.

Description

technical field [0001] The invention belongs to the field of preparation of high-entropy alloy materials, in particular to a method for preparing large-volume Al alloys using induction heating equipment and intermediate alloy raw materials. 0.5 CoCrFeNi high-entropy alloy method. Background technique [0002] High-entropy alloys have attracted the attention of many researchers for their unique alloy design concept and excellent performance. The high mixing entropy makes the high-entropy alloys solidify into simple solid solution structures such as face-centered cubic (FCC) and body-centered cubic (BCC). The unique structure makes high-entropy alloys have excellent properties in many aspects and have broad application prospects. For example, the high-entropy alloy solid solution structure has good thermal stability and strength at high temperatures, which makes it expected to be applied in the fields of aero-engines, ship engines, and key metal parts of ultra-supercritical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/03
CPCC22C1/03C22C30/00
Inventor 李金山郭桐寇宏超王毅唐斌其他发明人请求不公开姓名
Owner NORTHWESTERN POLYTECHNICAL UNIV
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