Microyielding of Core-Shell Crystal Dendrites in a Bulk-metallic-glass Matrix Composite
Name
Huang-2014-Microyielding of core-shell.pdf
Size
1.05 MB
Format
Adobe PDF
Checksum (MD5)
640d1ea58061810fe4bf2b4b9ea77265
Author(s)
Huang, E-Wen
Qiao, Junwei
Winiarski, Bartlomiej
Lee, Wen-Jay
Scheel, Mario
Chuang, Chih-Pin
Liaw, Peter K.
Lo, Yu-Chieh
Zhang, Yong
Di Michiel, Marco
Date Issued
March 2014
Journal
Scientific Reports
Publisher
Nature Publishing Group
Citation
Huang, E-Wen, Junwei Qiao, Bartlomiej Winiarski, Wen-Jay Lee, Mario Scheel, Chih-Pin Chuang, Peter K. Liaw, Yu-Chieh Lo, Yong Zhang, and Marco Di Michiel. “Microyielding of Core-Shell Crystal Dendrites in a Bulk-Metallic-Glass Matrix Composite.” Sci. Rep. 4 (March 18, 2014).
Version
Final published version
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 suggest that the interface, as Maxwell damper, 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.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Terms of Use
Creative Commons Attribution-NonCommercial-NoDerivs 3.0
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1038/srep04394
