|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||In Operando Nano- and Micro-mechanical Characterization of Materials with Special Emphasis on In Situ Techniques
||Size and Strain Rate-dependent Deformation Behavior of Metallic Glass Nanoparticles
||Jinwoo Kim, Eun Soo Park, Qi Zhang, Mo Li
|On-Site Speaker (Planned)
Research on nanomechanical responses of metallic glasses could lead to an in-depth understanding of the deformation mechanism related to the nucleation and propagation of shear bands. To avoid drawbacks of nanopillar test such as surface ion damage, we performed compression tests of metallic glass nanoparticles prepared by the FIB-less method from phase separated metallic glasses. The effect of particle size and strain rate on mechanical properties of fabricated amorphous particles has been investigated from the compression test using in-situ tester with SEM/TEM imaging. From the pseudo-stress-strain curves derived using contact mechanics theory and contact area calculation, we confirmed that the metallic glass nanoparticles have favorable conditions for homogenous-like deformation based on modified Griffith criterion and molecular dynamic simulations. The critical strain rate for homogenous-like deformation increases by particle size reduction. These results provide us with insights on evaluation of nano-mechanical properties and understanding of fundamental deformation mechanism of metallic glasses.
||Planned: A print-only volume