Effects of Ta Addition on NiTi Shape Memory Alloys

The effect of Ta addition on the martensitic transformation characteristics and the X-ray visibility on NiTi shape memory alloy have been studied in (Ni51Ti49)(1-x)Ta-x system. It was found that the transformation temperatures of the Ni51Ti49 binary alloy increased drastically by an addition of 0 similar to 4 at. pet Ta, but only slightly when the concentration exceeded 4 at. pet, the addition of Ta greatly decreases the sensitivity of the martensitic transformations to the variation in the Ni-Ti ratio. The addition of Ta to the NiTi binary alloy can improve its X-ray visibility.