Twinning, grain orientation, and texture variations in Mg alloy processed by pre-rolling

Publication date: Available online 20 April 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): Qingshan Yang, Qingwei Dai, Chao Lou, Jiahong Dai, Jianyue Zhang, Bin Jiang, Fusheng PanAbstractA pre-rolling (PR) process with a small pre-strain was applied along the transverse direction (TD) and the extrusion direction (ED) of non-basal and basal textured AZ61 Mg alloys at room temperature to investigate the induced twinning behavior. The microstructural evolution of the alloys was used to evaluate the grain-boundary effect in terms of the texture variation. The results demonstrated that {101¯2} extension twinning was introduced by the PR process and that the volume fraction of twins increased with increasing thickness reduction. The subdivision of grains via twinning induced grain reorientation that generated a prominent basal texture with the c-axis parallel to the normal direction (ND) after PR. The textured Mg alloy with this c-axis//TD feature can promote twinning activity. The twinning performance was critical to initiate plastic deformation, therefore to determine deformation behavior at room temperature. The deformation mechanism was also addressed related to the extension twin lamellae.Graphical abstract
Source: Progress in Natural Science: Materials International - Category: Materials Science Source Type: research