Influence of Deformation Mechanism on the Superplastic Forging of High-Strength Mg Alloy by Three-Dimensional Finite Volume Simulation

Abstract

Full three-dimensional finite volume method (FVM) simulation was carried out for two types of Mg alloys. The load-stroke curve, effective strain, effective stress, and strain rate were obtained during the virtual superplastic forging process. The above results for fine-grained Mg alloy showed localized flow behavior because of the change in dominant deformation mechanism at a high strain rate above ca. 0.8 s À1 . However, RS P/M Mg-Zn-Y alloy showed relatively uniform metal flow at the same strain rate.

Yield and Densification Behavior of Rapidly Solidified Magnesium Powders

“…Some forging simulations of magnesium alloys have already been examined and reported. 10,11) These reports reproduced real processing well and give us important directions for processing optimization. However, the previous reports analyzed using the numerical simulations were for solid magnesium and magnesium alloys, and powder forming of magnesium was not dealt by the numerical analysis.…”

Microstructural modification of cast Mg alloys by friction stir processing

“…1 Fine grained Mg-Y-Zn alloys produced by rapid solidification have very fine grains (y200 nm) and excellent mechanical properties (high tensile strength and ductility). [2][3][4] Extrusion of rapid solidified powder compacts is an effective method to produce a fine grain structure, but is not useful to produce large bulk materials. Metalworking such as forging, rolling and extrusion for casting Mg alloys with refined grains have been reported.…”