摘要
在20～250℃温度范围内,对AZ31镁合金薄板进行了单向拉伸、筒形件拉深以及胀形试验,并用金相显微镜观察了试验后试件的显微组织。分析了AZ31镁合金在不同工艺所对应的应力状态下塑性变形特点及其最佳成形温度。结果表明,变形过程中所受应力状态对AZ31镁合金最佳成形温度的影响很大,AZ31镁合金在成形过程中受单向拉应力时,其总延伸率随成形温度的升高而增加;应力状态主要为压应力时,最佳成形温度应在tr=1以下;而应力状态主要为双向拉应力时,其最佳成形温度应在tr=1以上。
Uniaxial tensile,deep drawing and stretch forming tests were conducted at tempera tures from 20 to 250℃ on rolled AZ31 Magnesium alloy sheets, and the microstructures after tests were observed using optical microscope. The plastic deformation characteristics and the optimum forming temperature of AZ31 Magnesium alloy sheets under different stress states in different processes were analyzed. The results show that stress state in deformation process had great influence on the optimum forming temperature of AZ31 Magnesium alloy sheets . The elongation to failure increased with increasing temperature under uniaxial tensile stress state, the optimum forming temperature should be under tr=1 for compress stress state, and if should be above tr=l for biaxial tensile stress state.
出处
《太原理工大学学报》
CAS
北大核心
2012年第4期444-448,共5页
Journal of Taiyuan University of Technology
基金
山西省自然科学基金资助项目(2010011033-1)
山西省教育厅高校科技研究开发资助项目(2007110)
太原理工大学博士基金资助项目
关键词
AZ31镁合金
应力状态
最佳成形温度
动态再结晶
塑性应变比
AZ31 magnesium alloy sheet
Stress state
optimum forming temperature
dynamic recrystallization
plastic strain ratio
