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Pegah Dalvand,Shahram Raygan,Gabriel A. López,Mariano B. Meléndez,Volodymyr A. Chernenko 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.9
In this study, the effect of isothermal aging on the thermoelastic martensitic transformation and microstructure of the asquenchedCu–12Al–3.5Ni–0.7Ti–0.05RE (RE = Ce, La) high temperature shape memory alloy was studied. The resultsshowed that the alloy microstructure and martensitic transformation are strongly influenced by the aging temperature ratherthan aging time. During aging at 350 °C the alloy was prone to both the precipitation of the γ2 phase and the bainitic transformation,resulting in a loss of martensitic transformation and damping capacity. The prolonged aging at 350 °C caused adecomposition of parent phase into the equilibrium γ2 phase alongside the α phase which produced a significant hardnessincrement. On the other hand, aging at 250 °C affected the microstructure only slightly producing insignificant shift in thetransformation temperatures. It was found that, the secondary phases including Ti-rich X-phase and the RE-rich phase werenot influenced by the aging process. The results prescribe a high temperature order of the stability of martensitic transformationfor this new alloy which is important for its high temperature shape memory applications.