挤压态AZ31镁合金恒温超塑性固态焊接研究  

Study on Isothermal Superplastic Solid-state Welding of Extruded AZ31 Magnesium Alloy

作　　者：李仟姗 林飞 杨裕泉 王飞[2] 

机构地区：[1]太原理工大学先进镁基材料山西省重点实验室材料科学与工程学院,山西太原030024 [2]太原理工大学矿业工程学院,山西太原030024

出　　处：《热加工工艺》2017年第23期170-172,共3页Hot Working Technology

基　　金：国家自然科学基金资助项目(51374152);山西省自然科学基金资助项目(201301142-3)

摘　　要：对AZ31镁合金进行了恒温超塑性压缩和恒温超塑性固态焊接试验,研究了AZ31镁合金在大气环境下恒温超塑性固态焊接可行的工艺参数。结果表明:温度对恒温超塑性固态焊接接头强度影响较大,时间的影响其次,应变速率的影响相对较小。恒温超塑性固态焊接过程中组织发生了动态再结晶,并能在更省能源、省时间的条件下,达到与扩散焊相当的接头剪切强度。在预压应力30 MPa、焊接温度450℃、应变速率为1×10^(-4) s^(-1)的条件下,经13 min压接,可实现AZ31镁合金的超塑性连接,剪切强度达到42.08 MPa。The isothermal superplastic compression and isothermal superplastic solid-state welding tests of AZ31 magnesium alloy were carried out, and the feasible process parameters of AZ31 magnesium alloy isothermal superplastic solid-state welding in atmospheric environment were studied. The results show that the influence of temperature on the strength of the isothermal superplastic solid-state welded joint is great, the influence of time is second, and the influence of strain rate is relatively. The dynamic reerystallization occurs during the process of isothermal superplastie solid-state welding and the shear strength of the joint is equivalent to that of diffusion bonding joint in more energy-saving and time-saving conditions. Under the prepressing stress of 30 MPa, welding temperature of 450 ℃, and strain rate of 1×10-4 s-1 for 13min, the superplastic solid-state welding of AZ31 magnesium alloy is successfully performed and the shear strength of the joint reaches 42.08 MPa.

关 键 词：AZ31 镁合金 恒温超塑性压缩 恒温超塑性固态焊接 

分 类 号：TG453.9[金属学及工艺—焊接]