Microstructure and Mechanical Properties of Particulate Reinforced NbMoCrTiAl High Entropy Based Composite

Tianchen Li; Bin Liu; Yong Liu; Wenmin Guo; Ao Fu; Liangsheng Li; Nie Yan; Qihong Fang

doi:10.3390/e20070517

Microstructure and Mechanical Properties of Particulate Reinforced NbMoCrTiAl High Entropy Based Composite

Entropy (Basel). 2018 Jul 10;20(7):517. doi: 10.3390/e20070517.

Authors

Tianchen Li¹, Bin Liu¹, Yong Liu¹, Wenmin Guo², Ao Fu¹, Liangsheng Li¹, Nie Yan³, Qihong Fang⁴

Affiliations

¹ State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China.
² College of Mechanical and Energy Engineering, Shaoyang University, Shaoyang 422000, China.
³ YuanMeng Precision Technology (Shenzhen) Institute, Shenzhen 518000, China.
⁴ College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China.

Abstract

A novel metal matrix composite based on the NbMoCrTiAl high entropy alloy (HEA) was designed by the in-situ formation method. The microstructure, phase evolution, and compression mechanical properties at room temperature of the composite are investigated in detail. The results confirmed that the composite was primarily composed of body-centered cubic solid solution with a small amount of titanium carbides and alumina. With the presence of approximately 7.0 vol. % Al₂O₃ and 32.2 vol. % TiC reinforced particles, the compressive fracture strength of the composite (1542 MPa) was increased by approximately 50% compared with that of the as-cast NbMoCrTiAl HEA. In consideration of the superior oxidation resistance, the P/M NbMoCrTiAl high entropy alloy composite could be considered as a promising high temperature structural material.

Keywords: high entropy alloys; mechanical properties; metal matrix composites.