A novel stress-induced martensitic transformation in a single-phase refractory high-entropy alloy

SCRIPTA MATERIALIA

卷:189

Article

Wang, Liang^1,2  Cao, Tangqing²  Liu, Xudong²  Wang, Benpeng²  Jin, Ke²  Liang, Yaojian²  Wang, Lu²  Wang, Fuchi²  Ren, Yang³  Liang, Jun¹  Xue, Yunfei² 

[1] Beijing Inst Technol, Inst Adv Struct Technol, Beijing 100081, Peoples R China

[2] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China

[3] Argonne Natl Lab, Xray Sci Div, Argonne, IL 60439 USA

关键词: High-entropy alloys;    High energy X-ray diffraction;    Martensitic transformation;    Lattice distortion;    Phase stability;   

DOI  :  10.1016/j.scriptamat.2020.08.013

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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