The microstructure and mechanical properties of ZL108 alloy with the content of Ti have been investigated; especially the influences of Ti content and nging temperature on high temperature mechanical properties have been studied. The results indicate that with an addi-tion of Ti

u-AI dendrite and eutcctic structure of ZL 108 alloy are refined

high temperature strength and ductility are increased remark ably

and the thermal expansion coefficient is decreased. The optimum Ti content and aging temperature are also discussed.