Ti substituted Ni-free Zr65-xTixCu17.5Fe10Al7.5 bulk metallic glasses with significantly enhanced glass-forming ability and mechanical properties

Abstract

Abstract We report the significant effect of Ti substitution on GFA and mechanical properties of Ni-free Zr-based BMGs. A series of Zr 65-x Ti x Cu 17.5 Fe 10 Al 7.5 (x\u202f=\u202f0, 2, 4, 6, 8) bulk alloys were fabricated by the injection copper-mold casting method, and new Zr 65-x Ti x Cu 17.5 Fe 10 Al 7.5 BMGs with Ti content of 2–6\u202fat.% were developed. Both the GFA and mechanical properties of the Zr 65-x Ti x Cu 17.5 Fe 10 Al 7.5 alloys are significantly enhanced with the increase of Ti content up to 4\u202fat.%. The as-prepared quinary Zr 61 Ti 4 Cu 17.5 Fe 10 Al 7.5 BMG shows the largest supercooled liquid region width of 86\u202fK, compressive fracture strength of 1915\u202fMPa and compressive plasticity of 11.4%, which are much higher than 38\u202fK, 1745\u202fMPa and 3.0% of the pristine Zr 65 Cu 17.5 Fe 10 Al 7.5 BMG.