Abstract
It has been reported that the Pt 3Al phase has two crystal structures: the high-temperature cubic form of L1 2 and the low-temperature tetragonal form of the distorted L1 2 structure D0’c. In this study, the structure of the Pt 3Al phase in quaternary Pt–Al–Ir–Nb and ternary Pt–Al–Nb alloys was investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD), differential thermal analysis (DTA), and transmission electron microscopy (TEM) technologies. The structure form was determined to be cubic L1 2. The stabilization of the L1 2-Pt 3Al structure in room temperature was attributed to the effect of Nb.
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