Grain Refinement in a Mg AZ91 Alloy via Large Strain Hot Rolling

Abstract

Significant grain refinement has been achieved in a cast Mg-based AZ91 alloy via large strain hot rolling. This is a simple processing method consisting of one rolling pass at intermediate temperatures with a large thickness reduction. The as-cast material was first homogeneized in order to obtain a homogeneous and equiaxed grain structure with a random texture. During processing, a double-peak basal texture develops, typical of rolled Mg alloys, that results from the operation of basal, prismatic and pyramidal hc þ ai slip. The stabilization of this deformation texture during rolling suggests that the mechanism for grain refinement is continuous dynamic recrystallization.

Influence of Rolling Routes on Press Formability of a Rolled AZ31 Mg Alloy Sheet

“…The double-peak texture of (0002) plane has been reported in the other studies. 18,19) It is noted that the texture intensities of the route 2, route 3 and route 4 specimens were weaker than that of the route 1 specimen, and in particular, the texture intensities of the route 3 and route 4 specimens were approximately half of that of the route 1 specimen. The fact that the route 2, route 3 and route 4 specimens showed lower texture intensities than the route 1 specimen is probably related to the deference in plastic flow during rolling, as shown in Fig.…”

Microstructural and textural evolution of AZ31 magnesium alloy during differential speed rolling

“…In the previous work, we reported that a large inclination of basal pole at about 15 • can be achieved by the DSR processing [10]. However, it is still lacking in understanding the microstructural and textural evolution during the DSR processing, even though several studies have been carried out on the microstructural and textural evolution of the Mg alloys during normal symmetric rolling [11][12][13][14][15][16]. A detailed understanding of how the microstructure and the texture change during the DSR processing is beneficial for an effective texture control.…”

Effect of initial texture on texture and microstructure evolution of ME20 Mg alloy subjected to hot rolling

“…On the contrary, the sample type 3 exhibits significant DRX, occurring at initial grain boundaries. The correlation between DRX mechanisms and the starting textures is not clear so far but according to del Valle et al [19], at high temperatures rotational dynamic recrystallization (RDRX) takes place in a material in which grains are not as favorably oriented to accommodate the rolling strain, i.e. grains with basal orientation.…”