Origin of Tetragonality of BCT Martensite in Substitutional Fe–Pd(–Ni) Disordered Alloys

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  • Origin of Tetragonality of BCT Martensite in Substitutional Fe–Pd(–Ni) Disordered Alloys

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In order to study the origin of tetragonality of bct martensite of substitutional type disordered Fe–Pd alloys, the change in the axial ratios and internal structures of the martensites with the systematic substitution of Pd for some of Ni in a typical bcc martensite of Fe–Ni alloys has been examined using optical and electron microscopy. It is found that the bct martensite is transformed from the fcc austenite not only via the fct martensite but also directly. The bct martensite is always accompanied by {112} internal twins in which the mottled contrast is observed. It is concluded that the tetragonality of the martensite is caused by the inhomogeneous arrangements of Pd atoms of the austenite.

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