|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIV
||L-27: Phase Separation in Cu47.5Zr48Al4Co0.5 Bulk Metallic Glass
||William Mark Rainforth, Haiyun Wang
|On-Site Speaker (Planned)
Liquid phase separation as a strategy to develop bulk metallic glass with large plasticity, has been studied in several systems, including CuZr-based BMG system. It was stated that structural heterogeneity could not only lead to multiplication of shear bands, but also could block the propagation of shear bands during deformation. In most circumstances, phase separation can be introduced into the system by adding alloying elements with a positive enthalpy of mixing with other constituents. Co has a small positive enthalpy of mixing with Cu (ΔHCo-Cu=+6kJ/mol) and has a large negative enthalpy of mixing with Zr (ΔHCo-Zr=-41kJ/mol). Thus, it is probable that this will induce phase separation in Cu-Zr-Al-Co quaternary system. Liquid phase separation in Cu47.5Zr48Al4Co0.5 was investigated using scanning electron microscopy (SEM), atomic force microscopy (AFM) and nanoindentation. Phase separation and CuZr B2 phase results in enhanced plasticity and work hardening.
||Planned: Supplemental Proceedings volume