Effect of annealing temperature on joints of diffusion bonded Mg/Al alloys  

退火温度对镁合金和铝合金扩散结合层的影响（英文）

作　　者：丁云龙 王建刚[2] 赵明[3] 巨东英 

机构地区：[1]Department of Material Science and Engineering,Saitama Institute of Technology [2]河北科技大学河北省材料近净成形技术重点实验室,石家庄050018 [3]辽宁科技大学材料科学与工程系,鞍山114051

出　　处：《Transactions of Nonferrous Metals Society of China》2018年第2期251-258,共8页中国有色金属学报（英文版）

基　　金：partially supported by the grant subsidy of the "Nano Project" for Private Universities: 2011-2014 from MEXT, Japan;supported by the "Advanced Science Research Laboratory" in Saitama Institute of Technology, Japan

摘　　要：To study the effect of annealing temperature on the joints between magnesium and aluminum alloys, and improve the properties of bonding layers, composite plates of magnesium alloy（AZ31 B） and aluminum alloy（6061） were welded using the vacuum diffusion bonding method. The composite specimens were continuously annealed in an electrical furnace under the protection of argon gas. The microstructures were then observed using scanning electron microscopy. X-ray diffractometry was used to investigate the residual stresses in the specimens. The elemental distribution was analyzed with an electron probe micro analyzer. The tensile strength and hardness were also measured. Results show that the diffusion layers become wide as the heat treatment temperature increases, and the residual stress of the specimen is at a minimum and tensile strength is the largest when being annealed at 250 ℃. Therefore, 250 ℃ is the most appropriate annealing temperature.为了研究退火温度对镁合金和铝合金结合层的影响,提高扩散层的性能,采用真空扩散结合的方法焊接镁合金(AZ31B)和铝合金(6061),然后依据热处理理论在电炉中进行退火处理。应用扫描电子显微镜对焊接层的组织进行观察,利用X射线衍射技术测量残余应力,借助EPMA检测元素分布。此外,还分别测量材料的抗拉强度和硬度。结果显示,扩散层随着热处理温度升高而变宽。相比之下,在250°C退火处理后的试样残余应力值最低,抗拉强度最大。结合实验结果,250°C是镁合金和铝合金扩散结合件的最适退火温度。

关 键 词：annealing temperature diffusion bonding diffusion layer residual stress tensile strength 

分 类 号：TG156.2[金属学及工艺—热处理]