Composition Dependence of Compatibility in Self-Accommodation Microstructure of β-Titanium Shape Memory Alloy

Abstract:

Composition dependence of the compatibility condition at junction plane (JP) (interface between habit plane variants (HV)) was evaluated by geometrically non-linear theory of martensite in Ti-Nb-Al shape memory alloys that have β (cubic) to α” (C-orthorhombic) martensitic transformation. The kinematic compatibility (KC) condition requires non-zero rotation of HV to form compatible JP; the angle of this rotation is termed θ. This means that the invariant habit plane (HP) and the compatible JP are not formed simultaneously. It turned out that twelve types of θ exist depending on the pair of HV. Composition dependence of each type of θ was systematically investigated. The previous results of transmission electron microscopy observations were also discussed in terms of the present results.

• Periodical: Advances in Science and Technology (Volume 78)
• Pages: 25-30
• DOI: https://doi.org/10.4028/www.scientific.net/AST.78.25
• Online since: September 2012
• Authors: Takeshi Teramoto, Masaki Tahara, Tomonari Inamura, Hideki Hosoda, Shuichi Miyazaki
• Keywords: Biomedical Alloy, Crystallography, Martensite

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