Direct Observation of Martensitic Transformation between Martensites in a Cu-Al-Ni Alloy

  • K. Otsuka
  • H. Sakamoto
  • K. Shimizu


The martensitic transformations in metals and alloys usually occur from matrix to martensite by cooling below some critical temperature, that is, from a loosely packed structure to more close packed structure in order to lower the internal energy, except for ferrous alloys where the magnetic energy is more significant. These transformations are usually characterized by the presence of the habit plane, the lattice invariant shear and the lattice rotation, and their crystallographies are well accounted for by the phenomenological theory under the invariant plane strain assumption (1, 2). Now, if stress is couppled as the second variable, even the martensitic transformation between martensites may become possible, in cases where several martensitic structures with similar free energies are available (3). In fact, there have been a few reports on the crystal structure change from one martensite to another by deformation in such alloy systems, Cu-Al (4~7) and Au-49(at%)Cd (8), although the transformation process itself is not fully investigated. Further, the present authors recently found that the martensitic transformation occurs from one martensite to another under certain conditions in a Cu-Al-Ni alloy (9). The purpose of the present paper is to describe in detail on how the transformation between martensites proceed morphologically and crystallographically in such an idealized situation that the starting specimen is a martensite single crystal.


Martensitic Transformation Critical Stress Habit Plane Shape Memory Effect Liquid Nitrogen Temperature 
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Copyright information

© Springer Science+Business Media New York  1975

Authors and Affiliations

  • K. Otsuka
    • 1
  • H. Sakamoto
    • 1
  • K. Shimizu
    • 1
  1. 1.Institute of Scientific and Industrial ResearchOsaka UniversityYamadakami, Suita, Osaka 565Japan

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