From brittle to ductile: Density optimization for Zr-BMG cellular structures

摘要

Two-dimensional cellular structures made from Zr_(35)Ti_(30)Cu_(7.5)Be_(27.5) bulk metallic glass with varying relative densities realized in hexagonal structures ranging from 2.5% to 86.0% were fabricated and characterized under quasi-static compression loading. Three distinctive deformation regions were revealed: collective buckling, local failure and global failure, which originate from size effects in metallic glasses and demonstrate the ideal density of ~25.0% for energy absorption for this structure. Published by Elsevier Ltd. on behalf of Acta Materialia Inc.