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Origin of embrittlement in metallic glasses #MMPMID27573817
Garrett GR; Demetriou MD; Launey ME; Johnson WL
Proc Natl Acad Sci U S A 2016[Sep]; 113 (37): 10257-62 PMID27573817show ga
Annealing embrittlement of metallic glasses is widely recognized as detrimental to their technological advancement, yet lacks fundamental understanding. Here, we identify a one-to-one correspondence between fracture toughness and shear modulus, which points to a correlation between liquid fragility and annealing embrittlement sensitivity. From a scientific perspective, this finding provides a thermodynamic and structural origin of annealing embrittlement, revealing that lower potential energy glass states having higher flow barriers and atomic structures with higher degree of order will demonstrate a lower fracture toughness. From a technological perspective, this result suggests that fragile glass formers would be more prone to annealing embrittlement compared with stronger glass formers, and as such, their fracture toughness would be more sensitive to their processing history.