Microstructure and Mechanical Properties of TaNbVTiAlx Refractory High-Entropy Alloys

Li Xiang; Wenmin Guo; Bin Liu; Ao Fu; Jianbo Li; Qihong Fang; Yong Liu

doi:10.3390/e22030282

Microstructure and Mechanical Properties of TaNbVTiAl_x Refractory High-Entropy Alloys

Entropy (Basel). 2020 Feb 29;22(3):282. doi: 10.3390/e22030282.

Authors

Li Xiang¹, Wenmin Guo¹, Bin Liu¹, Ao Fu¹, Jianbo Li², Qihong Fang³, Yong Liu¹

Affiliations

¹ State Key Lab of Powder Metallurgy, Central South University, Changsha 410083, China.
² School of Materials Science and Engineering, Chongqing University, Chongqing 400044, China.
³ College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China.

Abstract

A series of TaNbVTiAl_x (x = 0, 0.2, 0.4, 0.6, 0.8, and 1.0) refractory high-entropy alloys (RHEAs) with high specific strength and reasonable plasticity were prepared using powder metallurgy (P/M) technology. This paper studied their microstructure and compression properties. The results show that all the TaNbVTiAl_x RHEAs exhibited a single BCC solid solution microstructure with no elemental segregation. The P/M TaNbVTiAl_x RHEAs showed excellent room-temperature specific strength (207.11 MPa*cm³/g) and high-temperature specific strength (88.37 MPa*cm³/g at 900 °C and 16.03 MPa*cm³/g at 1200 °C), with reasonable plasticity, suggesting that these RHEAs have potential to be applied at temperatures >1200 °C. The reasons for the excellent mechanical properties of P/M TaNbVTiAl_0.2 RHEA were the uniform microstructure and solid solution strengthening effect.

Keywords: ductile; high-entropy alloy; powder metallurgy; refractory alloy; specific strength.

Abstract

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