Investigation of The Effect of Semi-Solid Temperatures and Holding Times at Isothermal Range On Microstructure of AZ31 Mg Alloy

Mg alloys have poor formability due to their hexagonal tightly packed (HCP) crystal structure, low active shear system at room temperature, and anisotropic behavior in polycrystalline structure. While this situation hindered the development commercialization of some extent past, today developments machining, liquid forming semi-solid technology removed these obstacles. Semi-solid has been subject intense R&D since it was discovered 1970s. In method, is aimed obtain ideal microstructure alloy, including excellent fluidity, appropriate flow control, adjustable viscosity controllable grain morphology, thanks equiaxed spherical solid particles surrounded by liquid. study, achieve required for shaping extruded AZ31 alloy heating temperatures isothermal holding temperature range. To accomplish objective, rapid induction coil controlled range were applied alloy. Heating a (565-630°C) subsequently cooling processes lead many intermetallic Mg17Al12(γ) compounds with heterogeneous distribution both primary Mg(α) grains boundaries as well very little eutectic boundaries. As value increased, degree spheroidization increased. However, found that growth reached maximum one point there no significant change shape factor result time.