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

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 excellent 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 analysis of serrated flow reveals plentiful and useful information of the underlying deformation process. As a result, our work provides an easy and effective way to extend the ductility of intrinsically-brittle BMGs, opening up wider applications of these materials.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [1] ;  [4] ;  [3] ;  [2]
  1. Purdue Univ., West Lafayette, IN (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. Univ. of Illinois at Champaign-Urbana, Champaign, IL (United States)
  4. Univ. of Manchester, Manchester (United Kingdom)
Publication Date:
OSTI Identifier:
1224521
Grant/Contract Number:
FE0011194
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 5; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Univ. of Tennessee, Knoxville, TN (United States); Univ. of Illinois at Champaign-Urbana, Champaign, IL (United States)
Sponsoring Org:
USDOE Office of Fossil Energy (FE)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE laser shock peening; characterization and analytical techniques; design; synthesis and processing