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CrFeMnVCu系高熵合金的微观组织和性能
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作者单位:

1.北京机电工程总体设计部;2.北矿检测技术有限公司

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基金项目:

国家高技术研究发展计划(863计划),2012AA03A513


Microstructure and Mechanical Properties of CrFeMnVCu High Entropy Alloys
Author:
Affiliation:

1.Beijing System Design Institute of Electro Mechanic Engineering;2.Bgrimm MTC Technology Co., Ltd

Fund Project:

National High Technology Research and Development Program 863, 2012AA03A513

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    摘要:

    本文在CrMnFeV四元合金的基础上添加奥氏体形成元素Cu元素,同时降低Mn元素含量,并采用电弧熔炼+铜模吸铸工艺制备了CrMnFeVCu系高熵合金,并系统研究了合金的成分设计和元素配比对高熵合金组织和性能的影响机理。结果表明,CrMnFeV四元合金由BCC固溶体和极少量B2颗粒组成,CrMnxFeVCu0.2x (x= 0.3、0.5、0.7、1)合金由BCC结构的树枝晶相和FCC结构的枝晶间相组成,且随着Cu含量的增加,FCC枝晶间相的体积分数和尺寸逐渐增大,相形态从颗粒状逐渐转变为长条状和块状。压缩试验表明,CrMn0.3FeVCu0.06合金的屈服强度最高(1273 MPa),且塑性优异(εf = 50.7%),随着Cu含量的增加,合金的力学性能逐渐降低,这主要归因于CrMnxFeVCu0.2x合金中主要的强化机制是位错强化和第二相强化,而FCC相尺寸的增大会降低第二相强化的效果。

    Abstract:

    In this paper, a series of new Cr-Mn-Fe-V-Cu high-entropy alloys with high ductility were prepared by arc melting and suction casting. It was found that with the addition of Cu, the structure of the alloys evolved from BCC+BCC1 phases (CrFeMnV alloy) to BCC + FCC phases (CrFeMnxVCu0.2xalloys). Formation of the Cu-Mn-rich FCC phase was caused by immiscibility of Cu with V, Cr and Fe. With increase of Cu, the volume fraction of FCC phase increased, and the morphology of the FCC phase transformed from granular particles to long strips and blocks. The five Cr-Mn-Fe-V-Cu HEAs present a great balance between strength and ductility. The CrFeMn0.3VCu0.06 alloy with granular FCC particles exhibits highest compressive yield strength (1273 MPa) and excellent ductility (εf = 50.7%). The dislocation and precipitate strengthening are responsible for high strength of the CrFeMn0.3VCu0.06 alloy. Therefore, the dislocation density and distribution of FCC phase are the crucial factors influencing both microstructures and mechanical properties of the HEAs.

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宋若康,张琳. CrFeMnVCu系高熵合金的微观组织和性能[J].稀有金属材料与工程,2021,50(10):3707~3713.[song ruokang, Zhang Lin. Microstructure and Mechanical Properties of CrFeMnVCu High Entropy Alloys[J]. Rare Metal Materials and Engineering,2021,50(10):3707~3713.]
DOI:10.12442/j. issn.1002-185X.20200817

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历史
  • 收稿日期:2020-10-22
  • 最后修改日期:2020-11-25
  • 录用日期:2020-12-23
  • 在线发布日期: 2021-10-28
  • 出版日期: 2021-10-25