High-strength Fe-Co-Ni-Cr-Mn high-entropy alloy and preparation method thereof

A high-entropy alloy and high-strength technology, applied in the field of high-entropy alloys, can solve problems such as adverse effects on alloy mechanical properties, restrictions on research and development and engineering applications, and difficult processes, so as to achieve good operability and practicability, and eliminate dendrites The effect of uniform organization and composition

Active Publication Date: 2018-06-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) It is necessary to mix the various raw material metals together to melt, and it must be heated to above their melting point, and generally requires multiple remelting to ensure the uniform diffusion of elements, which consumes a lot of energy, takes a long time, and the process is difficult;
[0007] (2) During the solidification process of the molten metal, the grains grow rapidly, and defects such as composition segregation and shrinkage cavity are prone to occur, which adversely affects the mechanical properties of the alloy
[0008] (3) Usually, a certain heat treatment process is required to obtain a specific structure, and the process is relatively complicated
[0010] In addition, among the five elements Fe, Co, Ni, Cr, and Mn, the raw material cost of Fe is the lowest, while the market prices of the other four elements are much higher than Fe, and they have been rising in recent years, which limits the cost of other elements to a certain extent. Atomic Ratio FeCoNiCrMn High Entropy Alloy and Its Product R&D and Engineering Application

Method used

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  • High-strength Fe-Co-Ni-Cr-Mn high-entropy alloy and preparation method thereof
  • High-strength Fe-Co-Ni-Cr-Mn high-entropy alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] A preparation method of a high-strength FeCoNiCrMn high-entropy alloy material adopts a forming method combining mechanical alloying and spark plasma sintering technology, which includes the following steps and process conditions:

[0042] Step 1: Preparation of FeCoNiCrMn high-entropy alloy powder by mechanical alloying method

[0043] Weigh Fe, Co, Ni, Cr, Mn elemental powders respectively according to the atomic ratio of 30%, 17.5%, 17.5%, 17.5%, and 17.5%, and mix them uniformly;

[0044] Put the mixed powder and balls into the ball mill tank of the planetary high-energy ball mill for ball milling. The material of the tank body and the balls are all stainless steel. The ball mill tank is evacuated and filled with high-purity argon (99.99%) as a protective atmosphere;

[0045]With the prolongation of ball milling time, the mixed powder gradually realizes alloying, and the mixed powder of various single powders transforms into the alloy powder with single-phase FCC st...

Embodiment 2

[0056] A preparation method of a high-strength FeCoNiCrMn high-entropy alloy material adopts a forming method combining mechanical alloying and spark plasma sintering technology, which includes the following steps and process conditions:

[0057] Step 1: Preparation of FeCoNiCrMn high-entropy alloy powder by mechanical alloying method

[0058] Weigh Fe, Co, Ni, Cr, Mn elemental powders respectively according to the atomic ratio of 40%, 15%, 15%, 15%, and 15%, and mix them uniformly;

[0059] Put the mixed powder and balls into the ball mill tank of the planetary high-energy ball mill for ball milling. The material of the tank body and the balls are all stainless steel. The ball mill tank is evacuated and filled with high-purity argon (99.99%) as a protective atmosphere;

[0060] With the prolongation of ball milling time, the mixed powder gradually realizes alloying, and the mixed powder of various single powders transforms into the alloy powder with single-phase FCC structure...

Embodiment 3

[0071] A preparation method of a high-strength FeCoNiCrMn high-entropy alloy material adopts a forming method combining mechanical alloying and spark plasma sintering technology, which includes the following steps and process conditions:

[0072] Step 1: Preparation of FeCoNiCrMn high-entropy alloy powder by mechanical alloying method

[0073] Weigh Fe, Co, Ni, Cr, Mn elemental powders respectively according to the atomic ratio of 50%, 12.5%, 12.5%, 12.5%, and 12.5%, and mix them uniformly;

[0074] Put the mixed powder and balls into the ball mill tank of the planetary high-energy ball mill for ball milling. The material of the tank body and the balls are all stainless steel. The ball mill tank is evacuated and filled with high-purity argon (99.99%) as a protective atmosphere;

[0075] With the prolongation of ball milling time, the mixed powder gradually realizes alloying, and the mixed powder of various single powders transforms into the alloy powder with single-phase FCC s...

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Abstract

The invention belongs to the technical field of high-entropy alloys, and particularly relates to a high-strength Fe-Co-Ni-Cr-Mn high-entropy alloy and a preparation method thereof. The preparation method comprises the following steps that (1) Fe, Co, Ni, Cr and Mn elemental powder is mixed for high-energy ball milling, the content of Fe is 30-60 at.%, the remaining elements are equal in atomic ratio, and alloy powder is obtained; and as for process conditions of ball milling, the ball-material ratio is 5:1-20:1, the rotational speed is 100-400 r/min, and the ball milling time is 10-60 h; and (2) discharging plasma sintering is conducted, as for process conditions, sintering equipment is a discharging plasma sintering system, the sintering current type is direct current pulse current, the sintering temperature is 800-950 DEG C, the temperature preservation time is 5-20 min, the sintering pressure is 30-50 MPa, and the temperature rising rate is 25-100 DEG C/min; and a high-entropy alloyblock material is obtained by sintering.

Description

technical field [0001] The invention belongs to the technical field of high-entropy alloys, in particular to a high-strength FeCoNiCrMn high-entropy alloy and a preparation method thereof. Background technique [0002] Traditional alloy materials generally refer to alloys that use one or two metal elements as the matrix and add one or more small amounts of other metal or non-metal elements to obtain the corresponding structure and obtain the target properties. At present, the requirements for the performance of alloy materials are getting higher and higher, but traditional alloy materials can no longer meet the increasing performance requirements, and the related research and development of traditional alloys have become saturated. [0003] The latest research in recent years has found that high-entropy alloys containing a variety of alloying elements tend to form solid solution phases with simple crystal structures, because in liquid or disordered solid solution states, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/04
CPCC22C1/04C22C30/00
Inventor 张进福龙雁彭海燕
Owner SOUTH CHINA UNIV OF TECH
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