|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIII
||Absence of Microscopic Elasticity in BMG and Its Implications
||Takeshi Egami, Yang Tong, Wojciech Dmowski
|On-Site Speaker (Planned)
Macroscopically metallic glasses show linear elasticity up to yielding. However, at the atomic level pure elasticity is totally absent, and even small deformation leads to cutting and forming of atomic bonds. Therefore, strictly speaking metallic glasses are intrinsically anelstic. These local plastic events of bond rearrangement soften the shear modulus, and leads to structural rejuvenation even before yielding. These relaxation events are different from the alpha- and beta-relaxations observed at higher temperatures. We tentatively call them gamma-relaxation. The structural change due to these events can be observed through the anisotropic pair-density function (PDF) obtained by x-ray diffraction. The extent of atomic rearrangements depends on composition, and appears to be directly related to ductility. This composition dependence provides a clue for developing new metallic glasses with high ductility.
||Planned: A print-only volume