6,500,000 Yen
(Direct Cost: 5,000,000 Yen Indirect Cost: 1,500,000 Yen)
Research Abstract
We examined the fatigue and orientation dependence of mechanical properties in single crystal Cu-Al-Mn shape memory alloy bars. The conclusions can be summarized as follows. (1) The fatigue properties improved as the size of grain becomes larger. The single crystal bars had much superior fatigue to multiple (bamboo) crystal and poly crystal bars. (2) Strong orientation dependence was observed in plasticity and fracture properties in single crystal bars. Highly ductile response was observed when the orientation was close to <1 1 2>, <1 1 3>, or <0 0 1> direction. In these bars, the fracture strain was close to 100 %.
