TEXTURE EVOLUTION DURING WIRE DRAWING OF Mg-RE ALLOY

摘要

Additions of rare-earth (RE) elements to extruded magnesiumalloys can lead to a weaker texture and the emergence of a new“RE-texture” component. Understanding the formation of thiscomponent after extrusion is difficult because the finalmicrostructure is often either partly or fully dynamicallyrecrystallized.In this paper, a magnesium alloy with RE addition was deformedby wire drawing at room temperature. This has enabled a fullyunrecrystallized microstructure to be retained after axis-symmetricdeformation.The drawn microstructure was characterized by elongated grainswith a strong basal fiber texture. Tensile, compression and doubletwins were visible but shear bands were not. During annealing,new statically recrystallized grains formed at grain and twinboundaries, leading to gradual weakening of the drawn texture butno emergence of the distinctive RE texture occurred. Thisobservation suggests that shear banding has a critical role informing the RE texture.