title: Laser Shock Peening on Zr-based Bulk Metallic Glass and Its Effect on Plasticity: Experiment and Modeling.
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.
authors.affiliation: Center for Laser-based Manufacturing, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA.
authors.forename: Yunfeng
authors.initials: Y
authors.lastname: Cao
authors.affiliation: Department of Materials Sci. &Eng., The University of Tennessee, Knoxville, TN 37996, USA.
authors.forename: Xie
authors.initials: X
authors.lastname: Xie
authors.affiliation: Department of Physics, University of Illinois at Urbana Champaign, IL 61801, USA.
authors.forename: James
authors.initials: J
authors.lastname: Antonaglia
authors.affiliation: School of Materials, The University of Manchester, Grosvenor Street, Manchester, M13 9PL, U.K.
authors.forename: Bartlomiej
authors.initials: B
authors.lastname: Winiarski
authors.affiliation: Department of Materials Sci. &Eng., The University of Tennessee, Knoxville, TN 37996, USA.
authors.forename: Gongyao
authors.initials: G
authors.lastname: Wang
authors.affiliation: Center for Laser-based Manufacturing, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA.
authors.forename: Yung C
authors.initials: YC
authors.lastname: Shin
authors.affiliation: School of Materials, The University of Manchester, Grosvenor Street, Manchester, M13 9PL, U.K.
authors.forename: Philip J
authors.initials: PJ
authors.lastname: Withers
authors.affiliation: Department of Physics, University of Illinois at Urbana Champaign, IL 61801, USA.
authors.forename: Karin A
authors.initials: KA
authors.lastname: Dahmen
authors.affiliation: Department of Materials Sci. &Eng., The University of Tennessee, Knoxville, TN 37996, USA.
authors.forename: Peter K
authors.initials: PK
authors.lastname: Liaw