|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIII
||Enhanced Plasticity in Zr-Cu-Ag-Al-Be Bulk Metallic Glasses
|| , Q.P. Cao, J.B. Jin, X.D. Wang, D.X. Zhang
|On-Site Speaker (Planned)
The dependence of plasticity on composition and structural relaxation in Zr-Cu-Ag-Al-Be BMG was studied. With increasing Zr content, the plasticity was enhanced and STZ volume became larger, while relaxation resulted in embrittlement with further enlarged STZ volume. Meanwhile, positron life time dropped with increasing Zr content and relaxation. Results indicate that neither STZ volume nor positron lifetime can describe deformability. Analyzing positron annihilation lifetime spectra, a bimodal distribution of free volume size was observed. Small free volume shrinks with increased concentration and large free volume expands with decreased concentration due to the increasing Zr content, while relaxation mainly reduces small free volume. The effects of free volume size distribution on STZ activation and shear band propagation have been discussed, and combining STZ volume with free volume size distribution can explain plasticity evolution with composition and structural relaxation, which may shed light on understanding deformation mechanism of BMGs.
||Planned: A print-only volume