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

We report the significant effect of Ti substitution on GFA and mechanical properties of Ni-free Zr-based BMGs. A series of Zr_65-xTi_xCu_17.5Fe₁₀Al_7.5 (x = 0, 2, 4, 6, 8) bulk alloys were fabricated by the injection copper-mold casting method, and new Zr_65-xTi_xCu_17.5Fe₁₀Al_7.5 BMGs with Ti content of 2–6 at.% were developed. Both the GFA and mechanical properties of the Zr_65-xTi_xCu_17.5Fe₁₀Al_7.5 alloys are significantly enhanced with the increase of Ti content up to 4 at.%. The as-prepared quinary Zr₆₁Ti₄Cu_17.5Fe₁₀Al_7.5 BMG shows the largest supercooled liquid region width of 86 K, compressive fracture strength of 1915 MPa and compressive plasticity of 11.4%, which are much higher than 38 K, 1745 MPa and 3.0% of the pristine Zr₆₅Cu_17.5Fe₁₀Al_7.5 BMG.