Phase, microstructure and compressive properties of refractory high-entropy alloys CrHfNbTaTi and CrHfMoTaTi

Jiaojiao Yi; Fuyang Cao; Mingqin Xu; Lin Yang; Lu Wang; Long Zeng

doi:10.1007/s12613-020-2214-x

Volume 29 Issue 6

Jun. 2022

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2022 > 29(6): 1231-1236

Jiaojiao Yi, Fuyang Cao, Mingqin Xu, Lin Yang, Lu Wang, and Long Zeng, Phase, microstructure and compressive properties of refractory high-entropy alloys CrHfNbTaTi and CrHfMoTaTi, Int. J. Miner. Metall. Mater., 29(2022), No. 6, pp. 1231-1236. https://doi.org/10.1007/s12613-020-2214-x

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Jiaojiao Yi, Fuyang Cao, Mingqin Xu, Lin Yang, Lu Wang, and Long Zeng, Phase, microstructure and compressive properties of refractory high-entropy alloys CrHfNbTaTi and CrHfMoTaTi, Int. J. Miner. Metall. Mater., 29(2022), No. 6, pp. 1231-1236. https://doi.org/10.1007/s12613-020-2214-x

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Research Article

Phase, microstructure and compressive properties of refractory high-entropy alloys CrHfNbTaTi and CrHfMoTaTi

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Corresponding author:
Lin Yang E-mail: yanglin@jsut.edu.cn
Received: 1 July 2020; Revised: 15 September 2020; Accepted: 19 October 2020; Available online: 20 October 2020

Abstract

Abstract

New refractory high-entropy alloys, CrHfNbTaTi and CrHfMoTaTi, derived from the well-known HfNbTaTiZr alloy through principal element substitution were prepared using vacuum arc melting. The phase components, microstructures, and compressive properties of the alloys in the as-cast state were investigated. Results showed that both alloys were composed of BCC and cubic Laves phases. In terms of mechanical properties, the yield strength increased remarkably from 926 MPa for HfNbTaTiZr to 1258 MPa for CrHfNbTaTi, whereas a promising plastic strain of around 15.0% was retained in CrHfNbTaTi. The morphology and composition of the network-shaped interdendritic regions were closely related to the improved mechanical properties due to elemental substitution. Dendrites were surrounded by an incompact interdendritic shell after Mo incorporation, which deteriorated yield strength and accelerated brittleness.
- refractory high-entropy alloys;
- phase structure;
- microstructure;
- yield strength;
- plastic strain

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