摘要
对6mm厚的航空用AA7050-T7451、AA2024-T4铝合金进行了同种和异种材料的搅拌摩擦焊接,并对3种接头的拉伸特性和断口进行了分析。试验结果表明,同种材料接头的强度极限达到母材的90%以上,屈服极限达到母材的75%以上,AA7050/AA2024 FSW接头强度分别达到AA7050母材和AA2024母材的60.5%和70.8%,屈服极限分别达到AA7050母材和AA2024母材的46.2%和75.5%;焊缝焊核区由细小均匀的等轴晶粒组成,热机影响区颗粒粗化并发生扭曲变形,热影响区晶粒受循环热影响变得粗大;拉伸试验断裂发生在前进侧热机影响区/热影响区的过渡段,断口存在明显的韧窝,整体属于韧性断裂。
This paper deals with the tensilel properties through jointing AA7050-T7451 and AA2024-T4 alu- minum alloys in aviation by friction stir weld and analyzing fracture surfaces. The results show that the ulti- mate strength can reach 90%, the yield limit can reach 75%, the ultimate strength of AA7050/AA2024 FSW joint can reach 60.5 % of AA7050 and 70.8 % of AA2024. The yield limit can reach 46. 2 % of AA7050 and 75.5% of AA2024. The equi-axial fine grains are found in the weld nugget, the coarse and distorted grains in the thermo-mechanically affected zone, and coarse grains in the heat affected zone. The fractures occur at the advancing side between thermo-mechanically affected zone and heat affected zone. Dimples ap- pear on the fracture surfaces, which means that the fractures are ductile fracture.
出处
《沈阳航空航天大学学报》
2013年第5期47-50,共4页
Journal of Shenyang Aerospace University
基金
辽宁省教育厅科研基金(项目编号:L2010415)
沈阳市人才项目(项目编号:src201101)
关键词
搅拌摩擦焊
铝合金
力学特性
断口分析
friction stir welding
aluminum alloys
mechanical property
fractography
