Bismuth effect on castability and mechanical properties of Ti―6Al―4V alloy cast in copper mold

摘要

The present research studies the effect of bismuth addition on castability, structure and mechanical properties of Ti―6Al―4V alloy. Experimental results indicate that addition of 1 wt.% bismuth in Ti―6Al―4V enhances both castability and strength of the alloy. Larger amounts of Bi addition caused a reduction in ductility. Undoped and 1Bi-doped alloys exhibited a ductile fracture surface covered with deformation dimples, while 3Bi and 5Bi alloys showed a brittle fracture surface.