|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIX
||Strength-controlled Fracture of Metallic Glass at the Micrometer Scale
||Ruitao Qu, Robert Maaß, Zengqian Liu, Robert O. Ritchie, Zhefeng Zhang, Cynthia A. Volkert, Feng Liu
|On-Site Speaker (Planned)
Smaller metallic glass (MG) samples usually exhibit higher plasticity accompanying with more ductile fracture behavior. Here we show micro-fracture testing results using a brittle Co-based MG and a ductile Zr-based MG. Surprisingly, higher toughness values were measured in larger rather than smaller samples for both MGs. Comparing the two different MGs, unexpectedly, higher toughness values were measured in the macroscopically more brittle Co-based MG than the Zr-based MG. Besides, the fracture stress of microscale crack-contained Co-based MG sample does not drop with increasing crack size or size of self-similar samples, showing a flaw insensitive behavior in brittle MG at the micrometer scale. These interesting results of MG failure at small length scale can be attributed to a transition of controlling factor for fracture from toughness in macroscale to strength in microscale.