【摘要】 研究AZ31B镁合金轧制道次间不同退火温度和时间对板材微观组织和力学性能的影响,分析了拉伸试样断口形貌。实验结果表明,退火处理后镁合金板材由轧制纤维组织转变为均匀等轴的再结晶组织,退火再结晶的起始温度为200℃;退火后的力学性能得到一定程度的恢复,硬度、屈服强度最大降幅分别为25.4%和37.1%,伸长率最大增幅达31.3%,拉伸断口由解理和韧窝混合断口转变为典型韧性断口。实验得到镁合金中间退火的较佳工艺为:退火温度300~320℃,退火时间60~120min。更多还原

【Abstract】 The microstructure evolution and mechanical property during intermediate annealing of AZ31B magnesium alloy sheet were investigated by using optical microscope and SEM.The results show that the onset temperature of recrystallization is 200℃.The hardness and the yield strength under the annealed state decrease by 25.4% and 37.1%,respectively,and the elongation increases by 31.3%.The fractography changes from the mixture of cleavage fracture and dimple fracture into entire dimple fracture.The optimal intermediate annealing technology for AZ31 magnesium alloy sheet is annealing at the temperature of 300～320℃ for 30～120 min.更多还原