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Title: Microyielding of core-shell crystal dendrites in a bulk-metallic-glass matrix composite

In-situ synchrotron x-ray experiments have been used to follow the evolution of the diffraction peaks for crystalline dendrites embedded in a bulk metallic glass matrix subjected to a compressive loading-unloading cycle. We observe irreversible diffraction-peak splitting even though the load does not go beyond half of the bulk yield strength. The chemical analysis coupled with the transmission electron microscopy mapping suggests that the observed peak splitting originates from the chemical heterogeneity between the core (major peak) and the stiffer shell (minor peak) of the dendrites. A molecular dynamics model has been developed to compare the hkl-dependent microyielding of the bulk metallic-glass matrix composite. As a result, the complementary diffraction measurements and the simulation results suggest that the interfaces between the amorphous matrix and the (211) crystalline planes relax under prolonged load that causes a delay in the reload curve which ultimately catches up with the original path.
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [6] ;  [7] ;  [8] ;  [5]
  1. National Central Univ., Jongli (Taiwan)
  2. Taiyuan Univ. of Technology, Taiyuan (China)
  3. Univ. of Manchester, Manchester (United Kingdom); National Physics Lab., London (United Kingdom)
  4. National Center for High-Performance Computing, Taichung (Taiwan)
  5. European Synchrotron Radiation Facility Beamline, Grenoble (France)
  6. Univ. of Tennessee, Knoxville, TN (United States)
  7. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  8. Univ. of Science and Technology of China, Beijing (China)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 4; Journal ID: ISSN 2045-2322
Nature Publishing Group
Research Org:
Univ. of Tennessee, Knoxville, TN (United States); Univ. of Illinois Urbana-Champaign, IL (United States)
Sponsoring Org:
USDOE Office of Fossil Energy (FE)
Country of Publication:
United States
36 MATERIALS SCIENCE; mechanical properties; metals and alloys
OSTI Identifier: