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Phase stability of the amorphous phase and non-equilibrium phase in a beta Ti-Zr-based shape memory alloy

Authors
Li, ShuangleiChoi, Mi-SeonNam, Tae-Hyun
Issue Date
1-Apr-2021
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Keywords
Ti-Zr-Nb-Sn alloy; Metastable phases; Shape memory alloys (SMA); Hydrogen absorption; High-resolution electron microscopy (HREM)
Citation
SCRIPTA MATERIALIA, v.195
Indexed
SCIE
SCOPUS
Journal Title
SCRIPTA MATERIALIA
Volume
195
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/3860
DOI
10.1016/j.scriptamat.2021.113721
ISSN
1359-6462
1872-8456
Abstract
This work presents the amorphization of metastable beta phase and the phase stability of the amorphous phase and non-equilibrium phase in a Ti-Zr-Nb-Sn shape memory alloy (SMA). The amorphous phases with lenticular shape uniformly embedded in beta matrix are observed in the twin-jet-electropolished thin foil specimen for transmission electron microscope (TEM) observations. Meanwhile, a co-existence of non-equilibrium athermal omega phase and nanodomain phases are found to be formed in the beta matrix. These non-equilibrium phases could favorably compete with the amorphous phase formation and render the amorphous phases are not formed, leading to that the amorphous phase is not observed in the bulk specimens for X-ray diffraction (XRD) and electron back-scattered diffraction (EBSD) and also TEM specimen prepared by a focused ion beam (FIB). The formation of the amorphous phase in the twin-jet-electropolished TEM specimen is thought to be due to the hydrogen-related artifacts introduced during twin-jet electropolishing. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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Nam, Tae Hyeon
대학원 (나노신소재융합공학과)
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