Finite element analysis for application to the forming process of Ti-based bulk metallic glasses

Abstract

Bulk metallic glass (BMG) alloys have been known to show superior formability under a Newtonian viscous mode in a supercooled liquid region (SLR). Crystalline phases generated by a high-temperature forming process have a negative effect on the formability of the BMG alloys by the rapid increase of viscosity for an amorphous matrix. A constitutive model considering dynamic crystallization and a viscous flow for high-temperature deformation behavior of the Ti-based BMG was used for n estimation of the formability, and was verified to apply to the forming process in an SLR. The experimental formability of the Ti-based BMG has been found to be in good agreement with the finite element analyses results based on the constitutive model, and thus enable one to apply to the other forming processes conducted in an SLR.