Deformation-induced spatiotemporal fluctuation, evolution and localization of strain fields in a bulk metallic glass

Wu, Yuan; Bei, Hongbin; Wang, Yanli; Lu, Zhaoping; George, Easo P.; Gao, Yanfei

doi:10.1016/j.ijplas.2015.05.006

Title: Deformation-induced spatiotemporal fluctuation, evolution and localization of strain fields in a bulk metallic glass

Journal Article · Sat May 16 00:00:00 EDT 2015 · International Journal of Plasticity

DOI:https://doi.org/10.1016/j.ijplas.2015.05.006· OSTI ID:1185809

Wu, Yuan ^[1]; Bei, Hongbin ^[2]; Wang, Yanli ^[2]; Lu, Zhaoping ^[3]; George, Easo P. ^[4]; Gao, Yanfei ^[4]

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)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Science and Technology Beijing, Beijing (China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Deformation behavior and local strain evolutions upon loading and unloading of a bulk metallic glass (BMG) were systematically investigated by in situ digital image correlation (DIC). Distinct fluctuations and irreversible local strains were observed before the onset of macroscopic yielding. Statistical analysis shows that these fluctuations might be related to intrinsic structural heterogeneities, and that the evolution history and characteristics of local strain fields play an important role in the subsequent initiation of shear bands. Effects of sample size, pre-strain, and loading conditions were systematically analyzed in terms of the probability distributions of the resulting local strain fields. It is found that a higher degree of local shear strain heterogeneity corresponds to a more ductile stressestrain curve. Implications of these findings are discussed for the design of new materials.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1185809

Alternate ID(s):: OSTI ID: 1249628

Journal Information:: International Journal of Plasticity, Vol. 71; ISSN 0749-6419

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 43 works

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