Self-Accommodation and Deformation Microstructure of Martensite in Ti₃₀Ni₅₀Zr₂₀ Alloy

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  • Onaka Koki
    Department of Materials Science and Engineering, Graduate School of Science and Technology, Kumamoto University
  • Hirayama Kyosuke
    Department of Materials Science and Engineering, Kyoto University
  • Matsuda Mitsuhiro
    Division of Materials Science and Chemistry, Faculty of Advanced Science and Technology, Kumamoto University

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  • Self-Accommodation and Deformation Microstructure of Martensite in Ti<sub>30</sub>Ni<sub>50</sub>Zr<sub>20</sub> Alloy

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<p>In a thermoelastic martensitic transformation, there is a “self-accommodation” in which the microstructure itself relieves strain induced by the transformation. In this study, the crystal structure and self-accommodation microstructure of martensite in Ti30Ni50Zr20 alloy were investigated using X-ray diffraction, scanning electron microscopy with electron backscatter diffraction, and transmission electron microscopy. In addition, the deformation microstructure was investigated by observing the samples after tensile tests. The crystal structure of the martensite in the Ti30Ni50Zr20 alloy was determined to be the B19′ monoclinic structure. In this alloy, plate- and polygonal-like variants with a width of a few microns were observed, and pairs of habit-plane variants (HPVs) forming {011}B19′ twins were observed at the interface. The self-accommodation has a mosaic-like morphology because of the combination of these pairs of HPVs. The (001)B19′ compound twins were formed as internal defects. These twins are considered to be lattice-invariant shear (LIS) of martensite in this alloy. No plateau region was observed in the tensile test. In the deformed specimen, the self-accommodation was collapsed by the movement of the HPV interface and the introduction of (100)B19′ compound twins was observed as an internal defect. This defect is considered to be not LIS but a deformation twin. The lack of a plateau region in the stress–displacement curve was attributed to these deformed microstructures.</p>

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  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 65 (3), 268-273, 2024-03-01

    公益社団法人 日本金属学会

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