C.M. Zhang

Preparation and Mechanical Properties of High Strength Zr-Based Bulk Metallic Glasses Containing High Content of Cu

Abstract The novel Zr-Ti-Cu-Ni-Be metallic glasses and composite with different contents of copper prepared by inject casting method are presented. The compositions and microstructures of these alloys were analyzed by using XRD and SEM. And the thermal stability was studied with differential scanning calorimeter (DSC). It is revealed that the value of Δ T x is increased gradually with the increase of copper content in Zr-Ti-Cu-Ni-Be alloys whereas the glass forming ability is decreased, indicating that Δ T x could not characterize their glass forming ability. In contrast, it is found that the glass forming ability is much higher when the component is close to eutectic spot. The compression test reveals that increasing of the content of copper in Zr-Ti-Cu-Ni-Be alloys can improve the mechanical property of the alloy significantly. The compressive fracture strength as high as 2.2 GPa can be obtained for the Zr-Ti-Cu-Ni-Be metallic glass with 18.5% Cu.

Novel Titanium Particles Reinforced Zr-based Bulk Metallic Glass Composites Prepared by Infiltration Casting

A novel Ti/Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 composite was successfully prepared by infiltrating the melt into sintered Ti preform. It shows that the introduction of Ti particles into the composite results in an increase in elastic strain to 3% and an enhancement of the strength up to 2.1 GPa. High specific strength has been obtained because of the decrease in density of the composite. It is suggested that an improvement in the mechanical properties of the composite may be attributed to the generation of multiple shear bands and some deformation in the Ti particles.