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

Abstract

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.

Authors:
 [1];  [2];  [2];  [2];  [3];  [4];  [2];  [2];  [5]
  1. Center for High Pressure Science and Technology Advanced Research, Pudong, Shanghai (China); China Academy of Engineering Physics, Sichuan (China)
  2. Center for High Pressure Science and Technology Advanced Research, Pudong, Shanghai (China)
  3. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Univ. of California, Santa Cruz, CA (United States). Dept. of Earth and Planetary Sciences
  5. Center for High Pressure Science and Technology Advanced Research, Pudong, Shanghai (China); Southeast Univ., Nanjing (China). Jiangsu Key Lab. of Advanced Metallic Materials, School of Materials Science and Engineering
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1542378
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Volume: 161; Journal Issue: C; Journal ID: ISSN 1359-6462
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Cheng, Benyuan, Zhang, Fei, Lou, Hongbo, Chen, Xiehang, Liaw, Peter K., Yan, Jinyuan, Zeng, Zhidan, Ding, Yang, and Zeng, Qiaoshi. Pressure-induced phase transition in the AlCoCrFeNi high-entropy alloy. United States: N. p., 2018. Web. doi:10.1016/j.scriptamat.2018.10.020.
Cheng, Benyuan, Zhang, Fei, Lou, Hongbo, Chen, Xiehang, Liaw, Peter K., Yan, Jinyuan, Zeng, Zhidan, Ding, Yang, & Zeng, Qiaoshi. Pressure-induced phase transition in the AlCoCrFeNi high-entropy alloy. United States. doi:10.1016/j.scriptamat.2018.10.020.
Cheng, Benyuan, Zhang, Fei, Lou, Hongbo, Chen, Xiehang, Liaw, Peter K., Yan, Jinyuan, Zeng, Zhidan, Ding, Yang, and Zeng, Qiaoshi. Wed . "Pressure-induced phase transition in the AlCoCrFeNi high-entropy alloy". United States. doi:10.1016/j.scriptamat.2018.10.020. https://www.osti.gov/servlets/purl/1542378.
@article{osti_1542378,
title = {Pressure-induced phase transition in the AlCoCrFeNi high-entropy alloy},
author = {Cheng, Benyuan and Zhang, Fei and Lou, Hongbo and Chen, Xiehang and Liaw, Peter K. and Yan, Jinyuan and Zeng, Zhidan and Ding, Yang and Zeng, Qiaoshi},
abstractNote = {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.},
doi = {10.1016/j.scriptamat.2018.10.020},
journal = {Scripta Materialia},
number = C,
volume = 161,
place = {United States},
year = {2018},
month = {10}
}

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