Martensitic Transformation in Ti<SUB>36.5</SUB>Ni<SUB>48.5</SUB>Hf<SUB>15</SUB> High Temperature Shape Memory Alloy

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  • Han X. D.
    Department of Physics and Materials Science, City University of Hong Kong
  • Chung C. Y.
    Department of Physics and Materials Science, City University of Hong Kong
  • Wang R.
    Beijing Laboratory of Electron Microscopy, Chinese Academy of Sciences
  • Zhang Z.
    Beijing Laboratory of Electron Microscopy, Chinese Academy of Sciences
  • Lai J. K. L.
    Department of Physics and Materials Science, City University of Hong Kong
  • Yang D. Z.
    Department of Materials Engineering, Dalian University of Technology

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  • Martensitic Transformation in Ti36.5Ni48.5Hf15 High Temperature Shape Memory Alloy
  • Martensitic Transformation in Ti36.5Ni4

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Abstract

The lattice invariant shear of the martensitic transformations in the Ti36.5Ni48.5Hf15 alloy was determined as a (001)B19′ compound twin by in-situ TEM technique. The morphological features of the (001)B19′ twin lamellas were revealed in detail. The shapes of the martensite variants were either the form of triangular, quadrilateral or lath plates. The mosaic-like morphology of the martensite variants corresponds to the cross section of the triangular, quadrilateral prisms, or the lath plates. The vertical section of the lath plates appears with a spear-like feature. The self-accommodation of the triangle, lateral prisms and the lath plates is usually composed of four martensite variants. There are 18 four-variants combinations of the mosaic-like martensite variants.

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