The cavitat io n erosion of TiNiNb alloy and 0Cr13Ni5Mo stainless steel wa s investigated u sing rotating disc e quipment.To simulate the effect of the collapse of vapor c a vities or bubbles,a Rockwell hardness tester was used to exert a load on th e surface areas of the alloys.The results show that the cavitation ero sion resi stance of TiNiNb is greater than that of 0Cr13Ni5Mo.The TiNiNb a lloy is mo re elastic than0Cr13Ni5Mo stainless steel in the in dentation test,thereby permitting TiNiNb to absorb and relieve more imp act energy during cavitation er osion.This reduces volume loss,a nd leads to excellent cavitations erosion res istance.