A Study of Phase Equilibria in the Al–Pd–Co System at 700 ∘C
Al68Pd14.6Co17.4, Al69.8Pd13.8Co16.4, Al72Pd12.8Co15.2, Al73.8Pd11.9Co14.3, and Al76Pd11Co13 alloys annealed at 700 ∘C for 2000 h were studied. In the investigation, scanning electron microscopy including energy dispersive X-ray spectroscopy and electron backscatter diffraction, X-ray diffraction, and transmission electron microscopy were used. Altogether five near-equilibrium phases (β, U, Al5Co2, ε, Al9Co2) were identified. Transitions between β, U, and ε phases were also determined dependent on the alloy bulk metal composition. The experimental results were used to propose the partial isothermal section of the Al–Pd–Co phase diagram at 700 ∘C. The maximum solubilities at 700 ∘C of Pd in Al9Co2 and Al5Co2 were determined as 1.7 and 2.69 at.%, respectively.
KeywordsPhase Diagram Electron Backscatter Diffraction Complex Phasis Maximum Solubility Metal Composition
The authors wish to thank to the European Regional Development Fund (ERDF) for financial support of the project ITMS:26220120014 “Center for development and application of advanced diagnostic methods in processing of metallic and non-metallic materials” funded within the Research & Development Operational Programme, to the Slovak Academy of Sciences for the support in the frame of the “Center of Excellence for functional multiphase materials“ (FUN-MAT), to the Slovak Research and Development Agency (APVV) for the financial support under the contract APVV-0076-11, as well as to the Grant Agency of the Ministry of Education, Science, Research, and Sport of the Slovak Republic and the Slovak Academy of Sciences (VEGA) for the financial support under the contracts 1/0143/12, 2/0111/11, and 1/0339/11.
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