| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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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** |
1School of Materials Science and Engineering, Tsinghua University, Beijing 100084
2Qian Xuesen Laboratory of Space Technology, Beijing 100094
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| Cite this article: |
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Zhi-Dong Han, Heng-Wei Luan, Shao-Fan Zhao et al 2018 Chin. Phys. Lett. 35 036102 |
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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.
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Received: 24 October 2017
Published: 25 February 2018
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| Fund: Supported by the National Natural Science Foundation of China under Grant No 51571127. |
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