双峰基面织构对 AZ31 板材胀形性能的影响

The difference between bimodal basal texture and basal sheet texture of AZ31 magnesium alloy sheet in equal biaxial tensile bulging forming was compared and studied. Through microstructure characterization and hardening behavior analysis, the improvement degree and mechanism of bimodal basal texture on the formability of magnesium alloy sheets were clarified. Experimental results show that the Erichsen cupping value of the bimodal basal texture sheet is increased by approximately 38. 8% compared with that of the basal sheet texture sheet, which is associated with the activation laws of deformation mechanisms along the strong basal texture direction during sheet bulging forming. It is found that the proportion of activated basal slip along the strong basal texture direction in the bimodal basal texture sheets reaches 50. 5%, 41. 4% higher than that in basal texture sheets. This enables the bimodal basal texture sheets to exhibit better uniform elongation and hardening capacity along the strong basal texture direction, reducing the likelihood of local necking instability during bulging forming. As a result, localized strain is gradually diffused to the surrounding areas, leading to superior equal biaxial tensile bulging performance.