Effect of Extrusion Speed on the Microstructure and Tensile Properties of AZ31 Alloy

Abstract

Abstract. The influences of extrusion speed on the microstructure and tensile properties of AZ31 alloy were investigated. The results suggested that the yield and tensile strength of AZ31 alloy decrease but elongation increases with the reduction of extruded speed. High speed extrusion produces fine grains with texture of c-axis perpendicular with extruded direction. The tension deformation is dominated by slip and the formed texture is obstructive for the basal slip, and also the inhomogeneous structure formed at high speed extrusion is harmful to the ductility. Samples extruded at low speed have comparatively homogeneous and coarse microstructure. Twinning provided more tension deformation and the lattice rotation induced by twinning is favorable for the activities of new slip systems, which induced the better ductility of AZ31 alloy.

Evaluating Plasticity of Alloy AD31 on Ingot Height

“…It is known that metal behaviour at hot deformation and, correspondingly, the stability of the process can be influenced by the following factors: manufacturing method and the quality of primary workpiece [6], presswork method [7], temperature and presswork velocity [8][9][10], strain degree [11], type of lubricants [12], presence of macro-structure defects in a cast blank [13,14], etc.…”