Microstructure and Mechanical Properties of CoCrFeMnNiCu<sub>x</sub> High Entropy Alloys

Zhao Dan; Luo Yongchun

doi:10.15980/j.tzzz.2017.11.018

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Microstructure and Mechanical Properties of CoCrFeMnNiCu_x High Entropy Alloys
Vol. 37, Issue 11, Pages: 1225-1228(2017)
Published： 2017 ，
DOI： 10.15980/j.tzzz.2017.11.018

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[1]赵丹,罗永春.CoCrFeMnNiCu_x高熵合金的微观组织及力学性能[J].特种铸造及有色合金,2017,37(11):1225-1228.

Zhao Dan, Luo Yongchun. Microstructure and Mechanical Properties of CoCrFeMnNiCu_x High Entropy Alloys. [J]. Special Casting & Nonferrous Alloys 37(11):1225-1228(2017)
[1]赵丹,罗永春.CoCrFeMnNiCu_x高熵合金的微观组织及力学性能[J].特种铸造及有色合金,2017,37(11):1225-1228. DOI： 10.15980/j.tzzz.2017.11.018.

Zhao Dan, Luo Yongchun. Microstructure and Mechanical Properties of CoCrFeMnNiCu_x High Entropy Alloys. [J]. Special Casting & Nonferrous Alloys 37(11):1225-1228(2017) DOI： 10.15980/j.tzzz.2017.11.018.

摘要

采用真空电弧炉制备了CoCrFeMnNiCu

高熵合金

研究了不同Cu含量对该体系高熵合金的微观组织及力学性能的影响。结果表明

高熵合金的微观组织为树枝晶

合金的枝晶富含Co、Cr、Fe

而枝晶间富含Ni、Mn。Cu易偏析于枝晶间

添加Cu并没有使合金晶体结构发生改变

仍为FCC结构。随着Cu含量的增加

合金的抗压强度及显微硬度先增大后减小

但增减幅度很小。当x=0.8时

合金的抗压强度和硬度达到最大值。含Cu的6组元高熵合金的抗压强度及显微硬度明显高于不含Cu的5组元高熵合金。

Abstract

CoCrFeMnNiCu

high entropy alloys were prepared by vacuum arc furnace

and effects of Cu content on its microstructure and mechanical properties were investigated.The results show that microstructure of the alloys exhibits the dendrites.The dendrites in all alloys are slightly enriched in Co

and the interdendritic is slightly enriched in Mn

while the Cu is segregated easily at interdendritic.The alloys still form a simple FCC solid solution after Cu addition.With the increase of Cu content

the compressive strength and microhardness of the alloys are increased firstly and then decreased

however

the change amplitude is very small.CoCrFeMnNiCu

alloy exhibits the highest compressive strength and microhardness when Cu content is 0.8.The compressive strength and microhardness of the six component high entropy alloy containing Cu are the higher than those of the five component high entropy alloy without Cu.