摘要
对6 mm厚AA2024-T4铝合金搅拌摩擦焊接头特性进行了研究。通过拉伸试验,得到了应力-应变曲线。用光学显微镜、显微硬度仪以及扫描电镜对焊接接头进行了金相分析、硬度测试以及断口分析。结果表明:试件断裂属于韧性断裂;断裂发生在前进侧热机影响区/热影响区的过渡区;当搅拌头转速为800 r/min,焊接速度为100 mm/min,接头力学性能良好,其抗拉强度为395.7 MPa,可达母材抗拉强度的90.2%。
The properties of 6 mm thickness aluminum alloy AA2024-T4 joint by friction stir welding were investigated. The stress-strain curve were obtained by tensile test. The microstructure of the joint were analyzed by microhardness test, optical microscopy and SEM. The results show that： the fracture of the specimen is belong to ductile fracture; the strain fracture appears in the advancing side of joints between TMAZ and HAZ; with the rotating speed of stirring joint at 800 r/min and welding speed at 100 mrn/min, the mechanical properties of joints are favourable, tensile strength can reach to 395.7 MPa which is 90.2% of base metals.
出处
《飞机设计》
2011年第5期18-21,共4页
Aircraft Design
