挤压态的AZ91镁合金恒温超塑性固态焊接  

Isothermal superplastic solid-state welding of extruded AZ91 magnesium alloy

作　　者：杨裕泉 林飞[1] 杨蕊鸿 王飞[2] 林鹏 YANG Yu-quan;LIN Fei;YANG Rui-hong;WANG Fei;LIN Peng(Key Laboratory of Advanced Magnesium-Based Materials in Shanxi Province,College of Materials Science ＆ Engineering,Taiyuan University of Technology,Taiyuan 030024,China;College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]先进镁基材料山西省重点实验室,太原理工大学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：《轻合金加工技术》2018年第10期70-73,共4页Light Alloy Fabrication 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AZ91镁合金挤压态板材进行300℃、30 min的焊前预退火处理,并将预退火处理后的AZ91镁合金进行恒温超塑性压缩试验,探讨AZ91镁合金在大气环境下的恒温超塑性固态焊接的可行性。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。在恒温超塑性固态焊接过程中组织发生了动态再结晶,并能在更省能源和时间的条件下,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14 min压接,可实现超塑性连接,剪切强度达到51.37 N/mm^2。Abstract： The extruded AZ91 magnesium alloy plate was pre-annealed at 300℃ for 30 min before welding. Then isothermal superplastic solid-state welding was carried out on AZ91 magnesium alloy plate. And the feasibility was studied for isothermal superplastic sol-id-state welding of AZ91 magnesium alloy in atmospheric environment. The results show that the influence of temperature on the strength of the isothermal superplastic solid-state welded joint is great, the effect of time is second, and the influence of strain rate is relatively small. The dynamic recrystallization occurrs during the process of isothermal superplastic solid-state welding, and in a more energy-saving and time-saving conditions, it can achieve the equiva-lent shear strength of diffusion bonding. Under the pre-pressing stress of 30 MPa, welding temperature of 450℃ for 14min and at the strain rate of 1 x 10^-4 s^-1, the superplastic solid- state welding is successfully performed and the shearing strength of the joint reaches 51.37 N/mm^2.

关 键 词：AZ9l镁合金 焊前预处理 恒温超塑性压缩 垣温超塑性固态焊接 

分 类 号：TG146.21[一般工业技术—材料科学与工程]