Pressure-induced phase transition in the AlCoCrFeNi high-entropy alloy

SCRIPTA MATERIALIA

卷:161

Article

Cheng, Benyuan^1,2  Zhang, Fei^1,4  Lou, Hongbo¹  Chen, Xiehang¹  Liaw, Peter K.⁵  Yan, Jinyuan^6,7  Zeng, Zhidan¹  Ding, Yang¹  Zeng, Qiaoshi^1,3 

[1] Ctr High Pressure Sci & Technol Adv Res, Shanghai 201203, Peoples R China

[2] China Acad Engn Phys, Mianyang 621900, Sichuan, Peoples R China

[3] Southeast Univ, Sch Mat Sci & Engn, Jiangsu Key Lab Adv Metall Mat, Nanjing 211189, Jiangsu, Peoples R China

[4] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

[5] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

[6] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

[7] Univ Calif Santa Cruz, Dept Earth & Planetary Sci, Santa Cruz, CA 95064 USA

关键词: X-ray diffraction (XRD);    Metal and alloys;    Polymorphic phase transformation;    High-pressure;   

DOI  :  10.1016/j.scriptamat.2018.10.020

来源: Elsevier

【 摘 要 】

The recently discovered pressure-induced polymorphic transitions (PIPT) in high-entropy alloys (HEAs) have opened an avenue towards understanding the phase stability and achieving atomic structural tuning of HEAs. So far, whether there is any PIPT in the body-centered cubic (bcc) HEAs remains unclear. Here, we studied an ordered bcc-structured (B2 phase) AlCoCrFeNi HEA using in situ synchrotron radiation X-ray diffraction (XRD) up to 42 GPa and ex situ transmission electron microscopy, a PIPT to a likely-distorted phase was observed. These results highlight the effect of the lattice distortion on the stability of HEAs and extend the polymorphism into ordered bcc-structured HEAs. (C) 2018 Acta Materialia Inc Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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