Abstract
The effect of addition of ternary elements, mainly In and Pd, on the phase fields of CuPt3 with the L12 type of ordered structure and CuPt with an L11 type of ordered structure in the Cu-Pt system has been investigated and the results compared with the substitution behaviour of the added elements and the electron-atom (e/a) ratio of the alloys. Electrical resistivity measurements and structural analysis by X-ray diffraction reveal that the addition of In leads to a shift of the phase field of the Cu3Pt towards the higher temperature regime and the Pt-rich side, and to a shift of the phase field of the CuPt towards the lower temperature regime and the Pt-rich side in the phase diagram of the Cu-Pt system. In contrast, the addition of Pd leads to a shift of the phase fields of both Cu3Pt and CuPt towards the lower temperature regime and the Cu-rich side. However, by plotting these phase fields on a temperature-e/a diagram, it is seen that the range of e/a ratio for each phase field is about 0.71-0.97 for the Cu3Pt phase and about 0.25-0.71 for the CuPt phase irrespective of the kind and amount of the added element.
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