Ultra-fine grained eutectic high-entropy alloy and preparation method thereof

A high-entropy alloy and ultra-fine grain technology, applied in the field of alloys, can solve the problems of easy macrosegregation, low strength and plasticity of high-entropy alloys, and achieve the effects of excellent fluidity, simple preparation method and broad application prospects.

Inactive Publication Date: 2019-05-14
GUANGDONG UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0006] The invention provides an ultra-fine-grain eutectic high-entropy alloy and a preparation method thereof, which solves the technical problems in the prior art that the high-entropy alloy has low strength and plasticity and is prone to macroscopic segregation

Method used

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  • Ultra-fine grained eutectic high-entropy alloy and preparation method thereof
  • Ultra-fine grained eutectic high-entropy alloy and preparation method thereof
  • Ultra-fine grained eutectic high-entropy alloy and preparation method thereof

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Embodiment 1

[0035] This embodiment discloses an Al 1.0 Cr 1.0 co x Fe y Ni Z mn i m j Alloy, whose general formula is Al 1.0 Cr 1.0 co 0.4 Fe 0.8 Ni 2.6 mn 0.4 W 0.1 V 0.05 ,

[0036] Al above 1.0 Cr 1.0 co 0.4 Fe 0.8 Ni 2.6 mn 0.4 W 0.1 V 0.05 The preparation method of eutectic high-entropy alloy comprises the following steps:

[0037] Step 1: selecting pure raw materials of Al, Co, Cr, Fe, Ni, Mn, W, V elements with a purity of at least 99.5 wt%;

[0038] Step 2: Alkali washing the alloy raw material to remove oil, washing in NaOH alkaline solution for 5-60 minutes, removing surface oil, and finally rinsing with distilled water;

[0039] Step 3: pickling to remove the oxide film, ultrasonic cleaning in hydrofluoric acid, nitric acid, and distilled aqueous solution for 5-60 minutes, to remove the surface oxide skin. Then rinse with distilled water and dehydrate with alcohol solution;

[0040] Step 4: Prepare the designed alloy with an analytical electronic balanc...

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Abstract

The invention relates to the technical field of alloys, in particular to an ultra-fine grained eutectic high-entropy alloy and a preparation method thereof. The invention discloses the ultra-fine grained eutectic high-entropy alloy. The general formula of the ultra-fine grained eutectic high-entropy alloy is Al<1.0>Cr<1.0>Co<x>Fe<y>Ni<Z>MnM<j>. The invention further provides the preparation method of the ultra-fine grained eutectic high-entropy alloy. The preparation method comprises the steps that 1, alloy raw materials are subjected to alkali washing and acid washing, thus a first alloy is obtained, and the raw materials comprises metals of Al, Co, Cr, Fe, Ni, Mn, W and V; 2, the Al metal and the Cr metal in the first alloy are placed on the bottommost part of a melting furnace crucible, the Co metal, the Fe metal and the Ni metal are placed at the middle and the upper part of the crucible, and the W metal and the V metal are placed at the uppermost part of the crucible; and 3, after the metals in the melting furnace crucible are totally melted, the Mn metal placed in a hopper in the melting furnace is mixed with the melted metals, and thus the ultra-fine grained eutectic high-entropy alloy is obtained. The invention provides the ultra-fine grained eutectic high-entropy alloy and the preparation method thereof, and the technical problems that in the prior art, the strengthand plasticity of the high-entropy alloy are low, and a macroscopic segregation phenomenon is prone to occurring are solved.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to an ultrafine-grain eutectic high-entropy alloy and a preparation method thereof. Background technique [0002] At present, the yield strength of commonly used stainless steel is about 500MPa. These stainless steels need to go through complex rolling and heat treatment processes to obtain a yield strength of 500MPa and above. While many key metal alloy parts require high yield strength, they must be cast as a whole and cannot be rolled, such as marine gables and propellers, gates used to cut off or dredge water flow, etc. Most stainless steels on the market cannot meet the requirements. related requirements. [0003] In view of the above market demand, there is an urgent need for an alloy that does not require rolling and complex heat treatment processes. Only using different casting techniques, the alloy base material after one-time casting has strength and plasticity far exceedi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02
Inventor 董勇黄譞胡垚章争荣程永奇
Owner GUANGDONG UNIV OF TECH
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