Strain glass in Ti50−xNi35+xCu15 shape memory alloys

Ti-Ni-based shape memory alloys exhibit three types of martensitic structures of B19′ (monoclinic), R (trigonal) and B19 (orthorhombic). So far, the strain glass has been reported in former two martensitic alloys, however, whether it exists in the third one is still unknown. Here, we report a findin...

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Bibliographic Details
Published in:Scripta materialia 2019-07, Vol.168, p.71-75
Main Authors: Hao, Yanshuang, Ji, Yuanchao, Zhang, Zhao, Yin, Mengye, Liu, Chang, Zhao, Hui, Otsuka, Kazuhiro, Ren, Xiaobing
Format: Article
Language:English
Subjects:
Martensitic transformation
Shape memory alloy
Strain glass
Ti-Ni-Cu
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Summary:Ti-Ni-based shape memory alloys exhibit three types of martensitic structures of B19′ (monoclinic), R (trigonal) and B19 (orthorhombic). So far, the strain glass has been reported in former two martensitic alloys, however, whether it exists in the third one is still unknown. Here, we report a finding of the strain glass in Ti-Ni-Cu B19-martensitic alloys. Our established phase diagram of Ti50−xNi35+xCu15 shows that the strain glass emerges at x ≥ 7, as evidenced by three experimental signatures: (I) invariance of average structure; (II) frequency dependence of elastic moduli at a strain glass transition temperature Tg; (III) formation of nanodomains. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2019.04.028