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The Microstructure and Mechanical Properties of Refractory High-Entropy Alloys with High Plasticity

by Yiwen Chen 1,2, Yunkai Li 1,2,*, Xingwang Cheng 1,2, Chao Wu 1,2, Bo Cheng 1,2 and Ziqi Xu 1,2
1
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
2
National Key Laboratory of Science and Technology on Materials under Shock and Impact, Beijing 100081, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(2), 208; https://doi.org/10.3390/ma11020208
Received: 15 November 2017 / Revised: 23 January 2018 / Accepted: 24 January 2018 / Published: 29 January 2018
(This article belongs to the Section Structure Analysis and Characterization)
Refractory high-entropy alloys (RHEAs) are promising materials used at high temperature, but their low plasticity restricts their application. Based on the valence electron concentration (VEC) principle, four kinds of RHEAs (ZrTiHfV0.5Nb0.5, Zr2.0TiHfVNb2.0, ZrTiHfNb0.5Mo0.5, and ZrTiHfNb0.5Ta0.5) are designed (VEC < 4.5). The experimental results show that the plasticity of these alloys was greatly improved: the static compressive strain was higher than 50% at room temperature (RT), and some elongations were produced in the tensile process. Moreover, the microstructure and phase composition are discussed in detail. The addition of Nb, Mo, and Ta contributed to the high-temperature strength. Finally, the dynamic mechanical properties of these RHEAs with coordination between strength and plasticity are investigated. View Full-Text
Keywords: RHEAs; alloys design; microstructure and mechanical properties RHEAs; alloys design; microstructure and mechanical properties
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Chen, Y.; Li, Y.; Cheng, X.; Wu, C.; Cheng, B.; Xu, Z. The Microstructure and Mechanical Properties of Refractory High-Entropy Alloys with High Plasticity. Materials 2018, 11, 208.

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