The Effects of Process Parameters on Evolutions of Thermodynamics and Microstructures for Composite Extrusion of Magnesium Alloy

Table 1

Physical properties of the AZ31 workpiece.

Property	AZ31
Heat transfer coefficient between tooling and billet (N/°C s mm^2)	11
Heat transfer coefficient between tooling/billet and air (N/°C s mm^2)	0.02
Poisson’s ratio	0.35
Coefficient of linear expansion	26.8𝐸−6
Density (Kg·m^−3)	1780
Poison’s ratio	0.35
Young’s modulus (Map)	45000
Emissivity	0.12