Direct synchrotron x-ray measurements of local strain fields in elastically and plastically bent metallic glasses

Journal Article · Thu Sep 03 00:00:00 EDT 2015 · Intermetallics

DOI:https://doi.org/10.1016/j.intermet.2015.08.010· OSTI ID:1238736

Wu, Yuan ^[1]; Stoica, Alexandru Dan ^[2]; Ren, Yang ^[3]; Ma, Dong ^[2]; Gao, Yanfei F. ^[4]; Bei, Hongbin ^[2]

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1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Science and Technology Beijing, Beijing (China); Univ. of Tennessee, Knoxville, TN (United States)
2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
3. Argonne National Lab. (ANL), Argonne, IL (United States)
4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

In situ high-energy synchrotron X-ray diffraction was conducted on elastically and plastically bent bulk metallic glass (BMG) thin plates, from which distinct local elastic strain fields were mapped spatially. These directly measured residual strain fields can be nicely interpreted by our stress analysis, and also validate a previously proposed indirect residual-stress-measurement method by relating nanoindentation hardness to residual stresses. Local shear strain variations on the cross sections of these thin plates were found in the plastically bent BMG, which however cannot be determined from the indirect indentation method. As a result, this study has important implications in designing and manipulating internal strain fields in BMGs for the purpose of ductility enhancement.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
• Grant/Contract Number: AC02-06CH11357; AC05-00OR22725
• OSTI ID: 1238736
• Alternate ID(s): OSTI ID: 1245020; OSTI ID: 1250590
• Journal Information: Intermetallics, Journal Name: Intermetallics Journal Issue: C Vol. 67; ISSN 0966-9795
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
bulk metallic glass
mechanical testing
metallic glasses
residual stress
synchrotron x-ray