Propagation and Deflection of Shear Bands in Metallic Glass under Circumferential Constraint

Propagation and deflection of shear bands in metallic glass under circumferential constraint was investigated. The study illustrates the formation and propagation of shear bands in metallic glass having a close relationship with the stress state and the circumferential limitation/constraint. The unsymmetrical circumferential limiting boundary to a Zr-based metallic glass sample during the small punch test, was also investigated to reveal the propagation. A Zr52.5Cu17.9Al10Ni 14.6Ti5 master alloy was prepared by arc melting element Zr, Cu, Al, Ni and Ti with a purity of 99.99% or in a Ti-getter argon atmosphere. The experiment was analyzed by X-ray diffraction (XRD) using a Rigaku diffractometer with Cu-radiation as a source. The results found the increase in compressive plasticity from 6% to 11%. The results suggests the strengthening metallic glass surface as an effective method to control the propagation and deflection of shear bands.