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To get insight into the structural defects on medium range in metallic glasses, molecular dynamic simulations on cavitation instability are carried out. It is found that micro voids are prone to nucleate at the sites where atomic clusters are loose packing on medium range. Close-up observation on atomic clusters around the nucleation site shows that there are two kinds of defects on medium range:...
An increasing tendency of serrated flow with increasing loading rate of a La-based (La) metallic glass (MG) with pronounced Johari-Goldstein relaxation in nanoindentation is investigated, which is abnormal compared to precedent observations where the serrated flow normally decays with increasing loading rate as discovered in the referenced Zr-based (Zr) and Pd-based (Pd) MGs. Based on systematic analysis,...
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