Fabrication and Characterization of Micro-dent Produced by Laser Shock Peening on Zr-based Bulk Metallic Glass

摘要

A Zr_(41.2)Ti_(13)._8Cu_(12).5Ni_(10)Be_(22.5) (vitl) bulk metallic glass was processed by Nd: Glass laser pulses with duration 30ns and energy in the range 20 to 30J. The surface morphology and surface micro-hardness of the vitl metallic glass, treated with varying laser energy, had been studied in detail. Laser shock peening induced plastic deformation and caused a micro-dent to be generated on the vitl surface. The optical profiling tests showed that laser pulse energy greatly influenced the diameter and depth of the micro-dents. The surface roughness which was caused by various laser pulse energy was assessed and characterized. The three-dimensional surface topography of the laser treated region on vitl surfaces had been characterized. In addition the plastic deformation features were also studied.