Microstructure and mechanical properties of UNbTiHf1-xMox high-entropy alloys

J. Shi; Y.Z. Zhang; X. Wang; C.L. Jiang; M. Wang; C. Ma; H. Huang

doi:10.1016/j.msea.2022.144239

Author(s)

J. Shi
Y.Z. Zhang
C.L. Jiang
M. Wang
C. Ma
H. Huang

Detail(s)

Original language	English
Article number	144239
Journal / Publication	Materials Science and Engineering A
Volume	860
Online published	29 Oct 2022
Publication status	Published - 6 Dec 2022
Externally published	Yes

Link(s)

DOI	DOI https://doi.org/10.1016/j.msea.2022.144239 Final Published version
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Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-85140996881&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(c92454b1-ed68-4817-9f98-ab80937168c7).html

Abstract

In this study, the microstructure evolution, phase transition, and mechanical properties of UNbTiHf_1-xMo_x (x = 0, 0.1, 0.3, 0.5, 0.7, 0.9, and 1) high-entropy alloys (HEAs) were investigated. The crystalline structure of the alloys changed from the initial single body-centered cubic (BCC) structure to a dual BCC structure. Thermodynamic analysis revealed that lattice distortion plays a great role in stabilizing the dual-phase microstructure over a single-phase one in the UNbTiHf_1-xMo_x (x > 0.5) HEAs. The structural changes were accompanied by corresponding variations in compressive properties. The alloys with a single-phase BCC structure exhibited relatively low strength but extended plasticity, whereas those with a dual-phase BCC structure became extremely brittle. The calculated stress–stain relationships of the dual-phase alloys indicate that the microdeformation state of the alloys changed constantly and that stress–strain coordination behaviors are manifested between the constituent phases.