Kyushu University Academic Staff Educational and Research Activities Database
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Soejima Yohei Last modified date:2021.04.05

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Academic Degree
Doctor of Engineering
Country of degree conferring institution (Overseas)
Field of Specialization
Material histology
Total Priod of education and research career in the foreign country
Research Interests
  • Imaging of phase transformation in crystalline materials with scanning electron microscopy (SEM)
    keyword : SEM, In-situ observation
  • nano-structure analysis and practical application of shape memory alloys
    keyword : shape memory and superelastic alloy, martensitic transformation, self-accommodation structure
Academic Activities
1. Y. Soejima, S. Motomura, Masatoshi Mitsuhara, T. Inamura, Minoru Nishida, In situ scanning electron microscopy study of the thermoelastic martensitic transformation in Ti-Ni shape memory alloy, Acta Materialia,, 103, 15, 352-360, 2016.01, The thermoelastic martensitic transformation from the B2 to B19′ structures in the Ti-Ni shape memory alloy was observed by in situ scanning electron microscopy in order to investigate the self-accommodation microstructure. Nucleation of the V-shaped habit plane variant cluster (2HPVC) triggers the formation of the hexangular HPVC (6HPVC) that is formed by six habit plane variants in the grain interior. The triangular morphology (3HPVC) is a derivative of 2HPVC. The autocatalytic transformation spreads from the 6HPVCs to the grain boundary and the reverse transformation proceeds like a rewind of the forward transformation. 2HPVC and 6HPVC are the most favorable morphologies for nucleation and growth, respectively, as explained by the analysis of the kinematic compatibility at junction planes...
Membership in Academic Society
  • The Japanese Society of Microscopy
  • The Janapn Institute of Metals and Materials