Microstructures and Mechanical Properties of AlCrFeNiMo$_{0.5}$Ti$_{x}$ High Entropy Alloys
Zhi-Dong Han1 , Heng-Wei Luan1 , Shao-Fan Zhao2 , Na Chen1** , Rui-Xuan Peng1 , Yang Shao1 , Ke-Fu Yao1**
1 School of Materials Science and Engineering, Tsinghua University, Beijing 1000842 Qian Xuesen Laboratory of Space Technology, Beijing 100094
Abstract ：Effects of Ti addition on the microstructures and mechanical properties of AlCrFeNiMo$_{0.5}$Ti$_{x}$ ($x=0$, 0.25, 0.4, 0.5, 0.6, 0.75) high entropy alloys (HEAs) are investigated. All these HEAs of various Ti contents possess dual BCC structures, indicating that Ti addition does not induce the formation of any new phase in these alloys. As Ti addition $x$ varies from 0 to 0.75, the Vickers hardness (HV) of the alloy system increases from 623.7 HV to 766.2 HV, whereas the compressive yield stress firstly increases and then decreases with increasing $x$ above 0.5. Meanwhile, the compressive ductility of the alloy system decreases with Ti addition. The AlCrFeNiMo$_{0.5}$Ti$_{0.6}$ and AlCrFeNiMo$_{0.5}$Ti$_{0.75}$ HEAs become brittle and fracture with very limited plasticity. In the AlCrFeNiMo$_{0.5}$Ti$_{x}$ HEAs, the AlCrFeNiMo$_{0.5}$ HEA possesses the highest compressive fracture strength of 4027 MPa and the largest compressive plastic strain of 27.9%, while the AlCrFeNiMo$_{0.5}$Ti$_{0.5}$ HEA has the highest compressive yield strength of 2229 MPa and a compressive plastic strain of 10.1%. The combination of high strength and large plasticity of the AlCrFeNiMo$_{0.5}$Ti$_{x}$ ($x=0$, 0.25, 0.4, 0.5) HEAs demonstrates that this alloy system is very promising for engineering applications.
收稿日期: 2017-10-24
出版日期: 2018-02-25
引用本文:
. [J]. 中国物理快报, 2018, 35(3): 36102-.
链接本文:
https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/35/3/036102
或
https://cpl.iphy.ac.cn/CN/Y2018/V35/I3/36102
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2018, Vol. 35 
