Annealing behavior of rolled AZ31 alloy sheet
(1.Key Laboratory for Advanced Manufacturing by Materials Processing Technology,Tsinghua University, Beijing 100084, China
2.北京市清华大学教育部先进材料加工技术重点实验室)
2.北京市清华大学教育部先进材料加工技术重点实验室)
Abstract: The annealed microstructures of the rolled AZ31 alloy sheets were examined by using light optical microscopy. The mechanical properties were measured by tensile testing, with their crystal orientations analyzed by X-ray diffraction (XRD). After the annealing treatment, the elongated grains were transformed to equiaxed grains with uniform and homogeneous structures. The changes of microstructure decreased the yield strength and enhanced the elongation. The analysis of XRD shows that the AZ31 alloy sheet possesses intense basal-texture, which is weakened during the recrystallization while reinforced during the grain growth. The intense basal-texture induces low ductility, which hence makes the further rolling more difficult. The results indicate that the optimum annealing treatment during AZ31 alloys sheet rolling is at about 300 ℃ for 60-120 min.
Key words: AZ31 alloys; rolling sheet; annealing treatment; microstructure; mechanical property; crystal orientation