摘要
在慢应变速率拉伸试验机上,分别测定了5083-H321铝合金板材及其搅拌摩擦焊焊缝在空气和3.5%NaCl溶液中的应力-应变曲线;借助光学显微镜、显微硬度仪、动电位扫描仪及扫描电子显微镜分析了焊缝和母材的微观组织、硬度分布、极化曲线及应力腐蚀断口的微观形貌.结果表明:焊缝的断裂强度及表层硬度分别达到母材强度及硬度的96%和90%,伸长率超过母材的2倍;应力腐蚀敏感指数低于母材;焊缝应力腐蚀断口呈现与母材断口不同的混合型断裂形貌.焊缝的细晶组织及第二相溶解是其抗应力腐蚀性能优于母材的本质原因.
Friction stir welding （FSW） is conducted for 5083-H321 aluminum alloy plates. The stress-strain curves of joints and parent metal （PM） in air and 3.5% NaCl solution were tested by using slow strain rate tention （SSRT） tester,respectively. The microstructure,polarization potential,fracture of stress corrosion cracking （SCC） and hardness were analyzed by using optical microscope （OM）,hardness tester,potentiodynamic scanner and scanning electron microscope （SEM）. The results show that the rupture strength and hardness of joints reaches 96 and 90 percent of those of PM,respectively. The elongation of joints is more than 2 times of that of PM. The SCC susceptibility index of joints is lower than that of PM. The SCC fracture shows mixed-type crack feature,which is different from that of PM. The fine microstructure and the dissolution of the second phase are the substantial reasons why the joints have better properties of anti SCC than that of PM.
出处
《材料研究与应用》
CAS
2010年第4期509-513,共5页
Materials Research and Application
基金
广东省重大科技专项(2008A090300004)
广东省教育厅211学科建设项目
关键词
5083铝合金
搅拌摩擦焊
慢应变速率拉伸
应力腐蚀
5083 aluminum alloy
friction stir welding
slow strain rate tension
stress corrosion cracking
作者简介
作者简介：袁鸽成（1963-），男，博士，教授．
