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Vol. 48 (2007) No. 11 P 2914-2918



The microstructure and superplastic behavior at 450°C and 500°C in Cu-Al-Mn-based shape memory alloys were investigated using optical microscopy and a tensile test. It was found that a fine α (fcc) + β (bcc) two-phase structure with a grain size of 3 μm in diameter can be obtained in Cu-Al-Mn-Ni alloy by annealing at 600°C. The flow stress of Cu-Al-Mn-Ni alloy depends on the strain rate and the strain rate sensitivity is over 0.3 with an elongation of over several hundred percent, which shows that the Cu-Al-Mn-Ni shape memory alloy exhibits superplasticity. For the test temperature at 500°C and a strain rate of 5×10−4 s−1, a maximal elongation of 1150% was obtained. The formation of cavity stringers lying parallel to the tensile axis was observed and the size of the cavity was larger as the specimen was more highly deformed.

Copyright © 2007 Journal of Japan Research Institute for Advanced Copper-Base Materials and Technologies

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