|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIII
||EE-2: Effect of Ni and Cu on the Thermal and Mechanical Properties of High Strength CoCrMoCB-based Bulk Metallic Glasses
||David Ehinger, David Geißler, Mihai Stoica, Jürgen Eckert
|On-Site Speaker (Planned)
The influence of partial substitution of Cr by Ni and micro-alloying of Cu on the thermal and mechanical properties of Co-Cr-Mo-C-B-(Ni, Cu) bulk metallic glasses (BMGs) was investigated. By increasing the Ni content up to 10 at.%, an enhanced plasticity of 3.1 % and a compression strength of ~4.5 GPa could be achieved. The higher plastic strain is related to the increase and decrease of the materials’ Poisson’s ratio and G/K ratio, respectively. A combination of different fracture mechanisms governs the strength and malleability of the Ni-containing BMGs. Hence, their fracture surfaces exhibit a high density of plastic flow layers, micro-shear bands and vein-like patterns initiating a crack bifurcation and branching. However, the final damage is caused by a local high-speed wavy cleavage fracture mode. The Cu-added glass reveals a good thermal stability but, as compared with the Cu-free alloys, the crystallization process and the deformation behavior are significantly changed.
||Planned: A print-only volume