| Pseudoelasticity behaviour and passivetion treatment on the shape memory alloys are known to have a great deal of influence on the stability of transformation temperature, shape recovery and improvement of corrosion resistance characteristics in their practical applications. The present work was aimed to examine the pseudoelasticity characteristics by tensile test, and corrosion resistance characteristics by corrosion test in Ti-Ni-X(X-Al, Cu) alloys with/ without passivation treatment. The results of this study are as follows, 1. The results of tensile test for Ti-Ni-X(X-Al, Cu) alloys show that the shape recovery is nearly perfect in martensite state and critical stress for slip is increased with increasing strain. Also, the pseudoelasticity behaviour appears in Ti_(50.0)Ni_(40.0)Cu_(10.0) alloy by unloading at temperature above Af and Ti_(50.0)Ni_(49.0)Al_(10.0) alloy by cold working over 25%. 2. The results of the anodic polarization corrosion test show that the corrosion resistance characteristics of Ti-Ni based alloys can be increased by application of passivation treatment and Ti-Ni-X(X=Al, Cu) alloys has better corrosion resistance characteristics than Ti-Ni equiatomic composition alloy. |
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