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

ABSTRACT: 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. The complementary diffraction measurements and the simulation results sug

SUBMITTER: Huang EW 

PROVIDER: S-EPMC3957129 | biostudies-literature | 2014 Mar

REPOSITORIES: biostudies-literature