Role of twinning on the omega-phase transformation and stability in zirconium
Journal Article
·
· Acta Materialia
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Université de Lille (France)
- Univ. of Chicago, IL (United States)
- Univ. of California, Santa Barbara, CA (United States)
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.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- 89233218CNA000001; AC02-06CH11357
- OSTI ID:
- 1579697
- Alternate ID(s):
- OSTI ID: 1579433
OSTI ID: 1593422
- Report Number(s):
- LA-UR--18-24949
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 185; ISSN 1359-6454
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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