AZ31B镁合金薄板超塑性气胀成形

Superplastic Gas Bulging Forming of AZ31B Magnesium Alloy Thin Sheet

摘要:

利用热拉伸试验、气胀成形、金相显微镜和扫描电镜，研究AZ31B镁合金薄板热拉伸性能、气胀成形性能及其组织结构。结果表明：在变形温度为425 ℃，应变速率为1.0×10-3~6.6×10-5s-1时，其流动应力4~12 MPa，延伸率则为200%~327%，挤压+热轧/冷轧的镁合金薄板表现出良好的超塑性；在变形温度为425 ℃，应变速率为1.0×10-3s-1条件下AZ31B镁合金板材的超塑气胀成形性能较好，胀形件的高度可达24 mm以上，其高径比大于0.80

Abstract:

The microstructure, the thermal tensile behaviors and the gas bulging forming formability of AZ31B Magnesium Alloy were investigated by thermal uniaxial tensile，gas bulging forming，optical microstructural observation and SEM observation. The results show that in the condition of 425 ℃, with a deformation rate of 1.0×10-3 ~ 6.6×10-5 s-1, a flow stress of 4~12 MPa, and an elongation of 200 %~327 %, the extrusion + hot/cold rolled magnesium alloy shows a good superplasticity. The AZ31B magnesium alloy shows a better formability at 425 ℃, 1.0×10-3 s-1 with a bulging height of more than 24 mm and H/r>0.80