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Accumulative roll bonding and post-deformation annealing of Cu-Al-Mn shape memory alloy

Moghaddam, A. O ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1007/s11665-014-1228-9
  3. Abstract:
  4. Accumulative roll bonding is a severe plastic deformation process used for Cu-Al-Mn shape memory alloy. The main purpose of this study is to investigate the possibility of grain refinement of Cu-9.5Al-8.2Mn (in wt.%) shape memory alloy using accumulative roll bonding and post-deformation annealing. The alloy was successfully subjected to 5 passes of accumulative roll bonding at 600 °C. The microstructure, properties as well as post-deformation annealing of this alloy were investigated by optical microscopy, scanning electron microscopy, x-ray diffraction, differential scanning calorimeter, and bend and tensile testing. The results showed that after 5 passes of ARB at 600 °C, specimens possessed α + β microstructure with the refined grains, but martensite phases and consequently shape memory effect completely disappeared. Post-deformation annealing was carried out at 700 °C, and the martensite phase with the smallest grain size (less than 40 μm) was obtained after 150 s of annealing at 700 °C. It was found that after 5 passes of ARB and post-deformation annealing, the stability of SME during thermal cycling improved. Also, tensile properties of alloys significantly improved after post-deformation annealing
  5. Keywords:
  6. Cu-Al-Mn shape memory alloy ; tensile properties ; Alloys ; Aluminum ; Annealing ; Bending (deformation) ; Differential scanning calorimetry ; Grain refinement ; Grain size and shape ; Manganese ; Martensite ; Microstructure ; Scanning electron microscopy ; Shape memory effect ; Tensile testing ; X ray diffraction ; Accumulative roll bonding ; Cu-Al-Mn ; Differential scanning calorimeters ; Martensite phase ; Martensite phasis ; Post-deformation annealing ; Refined grain ; Severe plastic deformation process ; Roll bonding
  7. Source: Journal of Materials Engineering and Performance ; Vol. 23, issue. 12 , 2014 , pp. 4429-4435 ; ISSN: 1544-1024
  8. URL: http://link.springer.com/article/10.1007/s11665-014-1228-9