Microstructure Similarities between Phases F and U in Al-Pd-Co Alloys

E-ISSN： 1662-9779|2016|258|440-443

ISSN： 1012-0394

Source： Solid State Phenomena, Vol.2016, Iss.258, 2017-01, pp. : 440-443

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Abstract

The work is aimed at searching for compositionally variant isostructural mutations of the cubic F-phase in both as-annealed (850°C/500 h) and DTA-cooled conditions of the Al₇₂Pd₉Co₁₉ alloy. Recently, the mutations were reported for the U-phase in the Al_69.8Pd_13.8Co_16.4 alloy annealed at 700°C for 2000 h. In the investigation, scanning electron microscopy including energy dispersive X-ray spectroscopy, powder X-ray diffraction, and differential thermal analysis (DTA) were used. Two isostructural mutations of the F-phase, F_L (the product of L-parent) and F_V (the product of V-parent), were identified (symbol L stands for liquid). On DTA-cooling, the bivariant heterogeneous transition (L_part→V), the monovariant heterogeneous transformation (L_rest→V+F_L), and the monovariant quasi-eutectoid transformation (V_rest→Al₅Co₂+F_V) were recorded.