Effect of Aging on the Structure and Transformation Behavior of Cu–12Al–3.5Ni–0.7Ti–0.05RE High Temperature Shape Memory Alloy

Pegah Dalvand; Shahram Raygan; Gabriel A. López; Mariano B. Meléndez; Volodymyr A. Chernenko

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자료유형: 학술저널

저자정보: Pegah Dalvand (University of Tehran) Shahram Raygan (University of Tehran) Gabriel A. López (University of Basque Country (UPV/EHU)) Mariano B. Meléndez (University of Basque Country (UPV/EHU)) Volodymyr A. Chernenko (University of Basque Country (UPV/EHU) and BCMaterials)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.26 No.9

발행연도: 2020.1

수록면: 1,354 - 1,365 (12page)

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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.

#Cu–Al–Ni–Ti–RE high temperature shape memory alloy · Aging · Rare earth elements · Martensitic transformation · Precipitates

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