Cavitation Erosion of Ti-Ni Base Shape Memory Alloys

Cavitatiton erosion tests were carried out by using Ti-Ni base SMA (shape memory alloy) with the addition of the third element (Co, Fe, V and Cu) to Ti Ni SMA. The erosion resistance and the mechanism were discussed. Erosion resistance of Ti Ni base SMAs is about 1/4 to 1/2 as compared with that of Ti Ni SMA, but it is about 6 to 16 times as high as that of SUS 304. It was found that the erosion resistance for martensite phase is superior to that for austenite phase. It was concluded that the erosion resistnace of Ti-Ni base SMAs depends mainly on the defect density and the removal rate of eroded area