Probe Embryonic Damage Evolution in Bulk Metallic Glasses under Plate-impact Loading
LNM, Institute of Mechanics, Chinese Academy of Sciences,
2 ISE, China Academy of Engineering Physics, Mianyang 621999, P.R. China
* Corresponding author: email@example.com
Published online: 7 September 2018
Microdamage in very short stress durations of spallation process in Zr-based bulk metallic glass (Zr-BMG) samples were captured by a specially designed plate impact technique. With stress durations vary, microdamage “frozen” in Zr-BMG samples exhibited different damage levels. Based on the morphology and stress environment of the microdamage, a compound microdamage evolution mode is applied to characterize the spallation evolution in Zr-BMGs. Especially the spallation in BMGs originates from cavitation instabilities in the weak regions with higher free volume content, which results in formation of ductile damage zones. The activation of shear transformation zones (STZs) or tension transformation zones (TTZs) between these ductile damage zones finally leads to detached spallation.
© The Authors, published by EDP Sciences, 2018
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