Micron-scale thermoplastic forming of metallic glasses
Lallit Anand (MIT)
Eringen Medal Symposium in honor of G. Ravichandran
Mon 2:40 - 4:00
Salomon 001
Metallic glasses are amorphous materials that possess unique mechanical properties, such as high tensile strengths and good fracture toughnesses. Also, since they are amorphous, metallic glasses exhibit a glass transition, and at temperatures above this glass transition, they soften dramatically and are therefore amenable to net-shape thermoplastic forming processes. This combination of superior properties and the ability to precisely form complex geometries makes metallic glasses attractive materials for micron-scale structural applications. In this talk we will present results on the following two topics related to the mechanics of metallic glasses: • We have developed a large-deformation, elastic-viscoplastic constitutive theory in a temperature range, which spans the glass transition of these materials. The theory has been implemented in a finite element program. The numerical simulation capability based on the theory is used to determine appropriate processing parameters in order to carry out a successful micron-scale hot-embossing operation for the thermoplastic forming of a Zr-based metallic glass tool for the manufacture of polymeric microfluidic devices. • The numerical simulation capability is also used to study surface tension-driven shape-recovery of nano/micro-scale features in a Pt-based metallic glass.