Thermal expansion of martensite in Ti29.7Ni50.3Hf20 shape memory alloy

Thermal expansion of martensite in Ti29.7Ni50.3Hf20 alloy was investigated by in situ neutron diffraction. It is found that the martensite exhibits a strong anisotropy in thermal expansion. The principal crystallographic axes and the coefficients of thermal expansion were determined. [Display omitte...

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Bibliographic Details
Published in:Intermetallics 2020-10, Vol.125, p.106889, Article 106889
Main Authors: Shuitcev, A., Vasin, R.N., Balagurov, А.M., Li, L., Bobrikov, I.A., Tong, Y.X.
Format: Article
Language:English
Subjects:
Anisotropy
Coefficient of thermal expansion
Crystallography
Invar
Martensite
Martensitic transformations
Negative thermal expansion
Neutron diffraction
Shape memory alloys
Thermal expansion
TiNiHf
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Summary:Thermal expansion of martensite in Ti29.7Ni50.3Hf20 alloy was investigated by in situ neutron diffraction. It is found that the martensite exhibits a strong anisotropy in thermal expansion. The principal crystallographic axes and the coefficients of thermal expansion were determined. [Display omitted] •Martensite in Ti29.7Ni50.3Hf20 alloy is characterized by the strong anisotropy of CTE.•The principal CTE values are −11.0·10−6, 15.4·10−6 and 24.1·10−6 °C−1, respectively.•The principal axes orient along [7.0.11‾], [010], and [11.0.4] lattice directions.
ISSN:0966-9795
1879-0216
DOI:10.1016/j.intermet.2020.106889