Microstructure and Hardness of Al<sub>x</sub>CrCuNiTi High-entropy Alloys

Guo Fuqiang

doi:10.15980/j.tzzz.2019.12.001

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Microstructure and Hardness of Al_xCrCuNiTi High-entropy Alloys
Vol. 39, Issue 12, Pages: 1277-1281(2019)
Published： 2019 ，
DOI： 10.15980/j.tzzz.2019.12.001

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[1]郭富强.Al_xCrCuNiTi高熵合金的微观组织与硬度[J].特种铸造及有色合金,2019,39(12):1277-1281.

Guo Fuqiang. Microstructure and Hardness of Al_xCrCuNiTi High-entropy Alloys. [J]. Special Casting & Nonferrous Alloys 39(12):1277-1281(2019)
[1]郭富强.Al_xCrCuNiTi高熵合金的微观组织与硬度[J].特种铸造及有色合金,2019,39(12):1277-1281. DOI： 10.15980/j.tzzz.2019.12.001.

Guo Fuqiang. Microstructure and Hardness of Al_xCrCuNiTi High-entropy Alloys. [J]. Special Casting & Nonferrous Alloys 39(12):1277-1281(2019) DOI： 10.15980/j.tzzz.2019.12.001.

摘要

采用非自耗真空电弧炉熔炼制备了Al

CrCuNiTi（x=0.2、0.4、0.6、1.0）高熵合金

利用X射线衍射仪（XRD）、扫描电镜（SEM）、能谱分析（EDS）和显微硬度计对合金的微观组织和硬度进行了分析。结果表明

CrCuNiTi合金主要由BCC1、BCC2和FCC固溶体相组成

随Al含量增加

合金中FCC相的相对含量减少而BCC相的相对含量增加

表明Al元素有利于BCC相的形成。合金微观组织主要呈树枝晶和枝晶间结构

随着Al含量增加

CrCuNiTi合金中的枝晶区域缩小而枝晶间区域扩大

Al、Cr、Ti偏析于枝晶区而Cu、Ni偏析于枝晶间区域。随Al含量的提高

CrCuNiTi合金的硬度（HV）从376增加至513。

Abstract

CrCuNiTi（x=0.2

0.4

0.6

1.0） high entropy alloys were prepared by arc melting process. The microstructure and hardness of the alloys prepared were characterized by X-ray diffraction（XRD）

scanning electron microscopy（SEM） and digital display Vickers hardness tester. The results reveal that the alloys are composed of a mixed structure of BCC1

BCC2 and FCC phases. With the increase of Al content

the FCC phase is decreased and the BCC phase is increased

which indicate that the Al element is in favor of the formation of BCC phase. The microstructure of the alloys presents a structure of dendrite and interdendrite. With the increase of Al element

the dendrite region is reduced while the interdendrite region is expanded in the Al

CrCuNiTi high entropy alloys. In addition

Cr and Ti are segregated in the dendrite region

while Cu and Ni are segregated in the interdendrite region. The hardness of the Al

CrCuNiTi alloys is increased to 513 HV from 376 HV as the increase of Al content.