Nano Shape Memory Alloy Composite Development and Applications
Final rept. 31 Jan 2008-31 Jan 2009
HOKKAIDO UNIV SAPPORO (JAPAN)
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The subject of this study is to process nano metallic fibers by physical method the fibers will be prepared by ion-sputtering of target material on porous alumina membrane. As compared to conventional chemical method, e.g. the reductive method of nickel nano powders, the physical method has advantages such that the diameter of metallic fibers is controllable by changing the size of holes of the template, and it can be applied to any kind of materials as long as sputtering deposition is possible. The present target material is nickel-titanium shape memory alloy SMA of nearly equiatomic composition 50 atomic percent of titanium. In this study I have succeeded to get nano-sized columnar crystal grown on the template. I have also found that the columnar crystal is easy to be disintegrated into nano particles and fibers by ultrasonic wave. The crystal structure and thermal property of the present nano SMA fibers were examined the results show they are almost identical to the bulk mother alloys.
- Metallurgy and Metallography