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Title: Role of twinning on the omega-phase transformation and stability in zirconium

Abstract

Typically, Group-IV transition metal zirconium is used in nuclear and chemical industries as a choice material for operating in extreme environments. At ambient-conditions, zirconium has a stable hexagonal-close-packed structure (α-phase), but under high-pressures it transforms into a simple-hexagonal structure (ω-phase). Experimental research involving high-pressures have reported retention of ω-phase upon recovery to ambient-pressures, which is undesirable since the ω-phase is brittle compared to the α-phase. Understanding the α-to-ω transformation is relevant for enhancing the applicability of transition metals. In this work using in-situ synchrotron X-ray diffraction, we show that deformation twins in the α-phase lower the transformation pressure and increase the amount of retained ω-phase. Our analysis concludes that the characteristics of the stress fields associated with the twins promote the α-to-ω transformation while making the reverse transformation energetically unfavorable. This work reflects a plausible way to design Zr microstructure for high-pressure applications via controlling twinning and retained ω-phase.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [1];  [3];  [3];  [4];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Université de Lille (France)
  3. Univ. of Chicago, IL (United States)
  4. Univ. of California, Santa Barbara, CA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
OSTI Identifier:
1579697
Alternate Identifier(s):
OSTI ID: 1579433
Report Number(s):
LA-UR-18-24949
Journal ID: ISSN 1359-6454
Grant/Contract Number:  
89233218CNA000001; AC02-06CH11357; 06SCPE401
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 185; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Phase transformation; High pressure; Zirconium; X-ray diffraction

Citation Formats

Mariyappan, Arul Kumar, Hilairet, N., McCabe, Rodney James, Yu, T., Wang, Y., Beyerlein, I. J., and Tomé, Carlos N. Role of twinning on the omega-phase transformation and stability in zirconium. United States: N. p., 2019. Web. doi:10.1016/j.actamat.2019.12.006.
Mariyappan, Arul Kumar, Hilairet, N., McCabe, Rodney James, Yu, T., Wang, Y., Beyerlein, I. J., & Tomé, Carlos N. Role of twinning on the omega-phase transformation and stability in zirconium. United States. doi:10.1016/j.actamat.2019.12.006.
Mariyappan, Arul Kumar, Hilairet, N., McCabe, Rodney James, Yu, T., Wang, Y., Beyerlein, I. J., and Tomé, Carlos N. Thu . "Role of twinning on the omega-phase transformation and stability in zirconium". United States. doi:10.1016/j.actamat.2019.12.006.
@article{osti_1579697,
title = {Role of twinning on the omega-phase transformation and stability in zirconium},
author = {Mariyappan, Arul Kumar and Hilairet, N. and McCabe, Rodney James and Yu, T. and Wang, Y. and Beyerlein, I. J. and Tomé, Carlos N.},
abstractNote = {Typically, Group-IV transition metal zirconium is used in nuclear and chemical industries as a choice material for operating in extreme environments. At ambient-conditions, zirconium has a stable hexagonal-close-packed structure (α-phase), but under high-pressures it transforms into a simple-hexagonal structure (ω-phase). Experimental research involving high-pressures have reported retention of ω-phase upon recovery to ambient-pressures, which is undesirable since the ω-phase is brittle compared to the α-phase. Understanding the α-to-ω transformation is relevant for enhancing the applicability of transition metals. In this work using in-situ synchrotron X-ray diffraction, we show that deformation twins in the α-phase lower the transformation pressure and increase the amount of retained ω-phase. Our analysis concludes that the characteristics of the stress fields associated with the twins promote the α-to-ω transformation while making the reverse transformation energetically unfavorable. This work reflects a plausible way to design Zr microstructure for high-pressure applications via controlling twinning and retained ω-phase.},
doi = {10.1016/j.actamat.2019.12.006},
journal = {Acta Materialia},
number = C,
volume = 185,
place = {United States},
year = {2019},
month = {12}
}

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