Journal
SCRIPTA MATERIALIA
Volume 189, Issue -, Pages 129-134Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2020.08.013
Keywords
High-entropy alloys; High energy X-ray diffraction; Martensitic transformation; Lattice distortion; Phase stability
Categories
Funding
- National Key Research and Development Program of China [2018YFB0703400]
- National Natural Science Foundation of China [51701018]
- China Postdoctoral Science Foundation [2019M660482]
- U.S. Department of Energy [DE-AC02-06CH11357]
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High-entropy alloys (HEAs) provide a new perspective to design metastable alloys with the stress-induced martensitic transformation (SIMT) for overcoming the strength-ductility trade-off. Here, we report a novel SIMT, orthorhombic to hexagonal close-packed martensite, in a single orthorhombic refractory HEA (Ti16Zr35Hf35Ta14 RHEA), showing a good yield strength-ductility matching. The analysis of the elastic distortion energy (Delta E-els) of Ti16Zr35Hf35Ta14 and several other RHEAs reveals that severe lattice distortion is a key factor which causes this SIMT. Combined the d-electron alloy design approach with the Delta E-els, the phase configuration and SIMT path in RHEAs can be well predicted. Our work brings new insights between the lattice distortion and SIMT of RHEAs, benefiting the metastable alloy development. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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