Laser shock peening on zr-based bulk metallic glass and its effect on plasticity: Experiment and modeling

Yunfeng Cao, Xie Xie, James Antonaglia, Bartlomiej Winiarski, Gongyao Wang, Yung C. Shin, Philip J. Withers, Karin A. Dahmen, Peter K. Liaw

Research output: Contribution to journalArticlepeer-review

Abstract

The Zr-based bulk metallic glasses (BMGs) are a new family of attractive materials with good glass-forming ability and excellent mechanical properties, such as high strength and good wear resistance, which make them candidates for structural and biomedical materials. Although the mechanical behavior of BMGs has been widely investigated, their deformation mechanisms are still poorly understood. In particular, their poor ductility significantly impedes their industrial application. In the present work, we show that the ductility of Zr-based BMGs with nearly zero plasticity is improved by a laser shock peening technique. Moreover, we map the distribution of laser-induced residual stresses via the micro-slot cutting method, and then predict them using a three-dimensional finite-element method coupled with a confined plasma model. Reasonable agreement is achieved between the experimental and modeling results. The analyses of serrated flows reveal plentiful and useful information of the underlying deformation process. Our work provides an easy and effective way to extend the ductility of intrinsically-brittle BMGs, opening up wider applications of these materials.

Original languageEnglish (US)
Article number10789
JournalScientific reports
Volume5
DOIs
StatePublished - May 20 2015

ASJC Scopus subject areas

  • General

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