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

被引：16
|
作者：
Kumar, M. Arul [1 ]
Hilairet, N. [2 ]
McCabe, Rj. [1 ]
Yu, T. [3 ]
Wang, Y. [3 ]
Beyerlein, I. J. [4 ]
Tome, C. N. [1 ]
机构：
[1] Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM 87545 USA
[2] Univ Lille, Unite Mat & Transformat, F-59655 Villeneuve Dascq, France
[3] Univ Chicago, Ctr Adv Radiat Sources, Chicago, IL 60637 USA
[4] Univ Calif Santa Barbara, Mat Dept, Mech Engn Dept, Santa Barbara, CA 93106 USA
来源：
ACTA MATERIALIA | 2020年 / 185卷
基金：
美国国家科学基金会;
关键词：
Phase transformation; High pressure; Zirconium; X-ray diffraction; RIETVELD TEXTURE ANALYSIS; STRAIN-RATE; DEFORMATION; TITANIUM; TEMPERATURE; ZR; IMPURITIES; TRANSITION; DEPENDENCE; BEHAVIOR;
D O I：
10.1016/j.actamat.2019.12.006
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 (alpha-phase), but under high-pressures it transforms into a simple-hexagonal structure (omega-phase). Experimental studies involving high-pressures have reported retention of omega-phase upon recovery to ambient-pressures, which is undesirable since the omega-phase is brittle compared to the alpha-phase. Understanding the alpha-to-omega 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 alpha-phase lower the transformation pressure and increase the amount of retained omega-phase. Our analysis concludes that the characteristics of the stress fields associated with the twins promote the alpha-to-omega transformation while making the reverse transformation energetically unfavorable. This work reveals a plausible way to design Zr microstructure for high-pressure applications via controlling twinning and retained omega-phase. Published by Elsevier Ltd on behalf of Acta Materialia Inc.
引用
收藏
页码：211 / 217
页数：7
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