Zr-Cu-Al形状記憶合金の材料組織と機械的性質に関する研究

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  • Microstructure and mechanical properties of Zr-Cu-Al shape memory alloy

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<p>Recently, Ti-Ni shape memory alloys (SMA) are used as temperature sensors and actuators. However, the driving temperature range of the shape recovery behavior of Ti-Ni SMA has been limited in the temperature range below 100 ° C. Therefore, more recently, Zr-Cu SMA has attracting attention as a high temperature SMA, which is driven in the temperature range over 100 ° C. However, because of the difficulty of microstructure control of Zr-Cu binary alloy, it is difficult to control the martenstic transformation behavior. Therefore, relatively little is known about the martensitic transformation behavior, shape memory effect and mechanical properties of ZrCu-based SMA. The objective of this study is to clear the effect of additional third element on microstructure, martenstic transformation behavior and mechanical properties of ZrCu based SMA. In this study, Zr-Cu-Al alloys with different alloy compositions were prepared by arc melting method. The alloy composition of the fabricated sample is Zr- (50-x / 2) Cu-xAl (x = 0, 2, 4, 6, 8 at.%). XRD tests were performed to investigate the effect of Al concentration on the microstructure. Vickers hardness tests were performed to investigate the effect of Al concentration on the hardness. As the results it was found that the Al concentration affects the microstructure and mechanical properties of ZrCu-based SMA.</p>

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