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Martensitic transformations in NiMnAl β phase alloys

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Abstract

Martensitic transformation characteristics in a wide range of alloy compositions in the NiMnAl system have been investigated by differential scanning calorimetry (DSC), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The results indicate that while the NiMnAl alloys with relatively high Al and Mn contents transform martensitically to either the 14M(7R) or the 10M phase with a long-period stacking-order structure, those with low Al or Mn contents transform to the L10(3R:2M) structure. TheM s temperature and thec/a ratio of the L10 martensite increase with decreasing Al or Mn content. In the Ni-30Mn-20Al alloy, typical premartensite microstructures, such as needlelike, modulated, and tweed structures, are observed and it is also found that a distorted B2 structure is formed as an intermediate phase prior to transformation to the 10M martensite.

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Author notes

  1. H. Nakano (Graduate Student)

    Present address: the Department of Materials Science, Faculty of Engineering, Tohoku University, 980-77, Sendai, Japan

Authors and Affiliations

  1. the Department of Materials Science, Faculty of Engineering, Tohoku University, 980-77, Sendai, Japan

    R. Kainuma (Associate Professor) & K. Ishida (Professor)

  2. Hitachi Metals Co., 321-43, Mohka, Japan

    H. Nakano (Graduate Student)

Authors
  1. R. Kainuma
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  2. K. Ishida
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  3. H. Nakano
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Kainuma, R., Ishida, K. & Nakano, H. Martensitic transformations in NiMnAl β phase alloys. Metall Mater Trans A 27, 4153–4162 (1996). https://doi.org/10.1007/BF02595663

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  • DOI: https://doi.org/10.1007/BF02595663

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