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Room‐Temperature Mechanical Properties of V 20 Nb 20 Mo 20 Ta 20 W 20 High‐Entropy Alloy
Author(s) -
Wu Shao Jie,
Wang Xiao Di,
Lu Jin Tao,
Qu Rui Tao,
Zhang Zhe Feng
Publication year - 2018
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201800028
Subject(s) - materials science , indentation hardness , brittleness , alloy , microstructure , indentation , high entropy alloys , plasticity , composite material , ductility (earth science) , cracking , shear (geology) , metallurgy , creep
Refractory high‐entropy alloys (HEAs) have shown promising high temperature strengths, while their mechanical behaviors at room temperature are rarely reported. In this work, the room‐temperature mechanical properties of V 20 Nb 20 Mo 20 Ta 20 W 20 refractory HEA under various different loading modes including tension, compression, bending, shear loading, and microhardness are investigated. The results show that this alloy exhibits very high compressive strength but quite low strengths under tension, bending, and shear loading, similar to the conventional brittle materials. However, pronounced plasticity and slip bands are observed in compression samples, and no indentation cracking is observed in low‐load microhardness tests, which indicate the potential ability of plastic deformation in this refractory HEA. The present work suggests that the microstructure or composition of this HEA should be carefully tailored before its practical usage to suppress its large tendency for cracking and eventually improve its ductility and strength under tension.