| Abstract |
| Transformation behavior and shape-memory characteristics of Ti-50.2 at%-Ni alloy were investigated after solution-treatment followed by cold working. The B2 → R → B19’ transformation occurred when the cold-worked samples were cooled, while the B2 → B19’ transformation occurred in the solution-treated sample. M* (the DSC peak temperature corresponding to the R → B19’ transformation) decreased with increase in the amount of cold working, while R* (the DSC peak temperature corresponding to the B2 → R transformation) kept almost constant. Negligible transformation-elongation occurred under the stress of 10 MPa applied to the solution-treated sample, while that was dramatically increased up to 3 % when the equal level stress was applied to the cold-worked(9% area reduction) sample. The residual elongation increased with increase in the amount of cold-working under applied stress less than about 70 MPa, while it decreased under applied stress higher than about 70 MPa. |
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| Key Words |
| transformation behavior, cold working, shape memory characteristics, X-ray diffraction, transformation elongation |
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