CAJ | 학술논문

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%。
대6 mm후AA2024-T4려합금교반마찰한접두특성진행료연구。통과랍신시험,득도료응력-응변곡선。용광학현미경、현미경도의이급소묘전경대한접접두진행료금상분석、경도측시이급단구분석。결과표명：시건단렬속우인성단렬;단렬발생재전진측열궤영향구/열영향구적과도구;당교반두전속위800 r/min,한접속도위100 mm/min,접두역학성능량호,기항랍강도위395.7 MPa,가체모재항랍강도적90.2%。
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.