A New Ordered Phase in Tempered 63.8Ni–1Co–Al Martensite

  • Enami K.
    Department of Materials Science and Engineering, Faculty of Engineering, Osaka University
  • Nenno S.
    Department of Materials Science and Engineering, Faculty of Engineering, Osaka University

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  • A New Ordered Phase in Tempered 63.8Ni–1Co–Al Martensite

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The process of tempering of the 63.8Ni–1Co–Al martensite has been investigated by electron microscopy. A new ordered phase with the Pt5Ga3 type structure is found when the martensite is tempered at relatively low temperatures, 573–673 K, for several ten minutes. This tempered phase is the same in microstructure and configuration of internal defects as the as-quenched martensite except “ordering” in atomic arrangement.

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