| Characteristics of Cu-based shape memory alloy are high elastic anisotropy and large grain size. So their mechanical properties such as fracture strength, ductility and fatigue strength are low by intergranular fracture due to those characteristics, and they are worse available than Ti-Ni alloys in practical applications. In this work, the study of manufacturing process of Cu-Al-Ni alloy by powder metallurgy using HIP technology was carried out in order to improve the mechanical properties. According to this experiment, more increasing of hot rolled ratio became coarser in grain size. Although increasing of the temperature in solution treatment there was not changed in grain size. In spite of having larger grain size of the specimen by powder metallurgy than that of the specimen by ingot making method, the fracture strength and elongation were increased by 25∼60 % and 90∼110%, respectively. |
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