摘要
采用搅拌摩擦焊接方法对厚度为12mm的2519铝合金板进行焊接试验。实验结果表明：在焊接速度为140mm／min，旋转速度为1800-2200r／min时，随着旋转速度的增加，焊缝强度先增加后减小；在旋转速度为2000r／min时，可以获得较好的焊接接头，抗拉强度达到最大值296MPa，断裂形式为韧性和脆性的混合型断裂。光学显微镜、扫描电子显微镜和电子能谱分析结果表明：焊缝中组织的差异及晶界上粗大的富铜析出相是导致焊缝强度低于基材强度的原因；焊缝中的组织差异及晶界富铜析出相的形成是焊缝区温度沿板厚的急剧变化和搅拌力综合作用的结果。
Friction-stir-weld of 2519 aluminum plate in 12 mm thickness was completed. The experiment result shows that the welds＇ mechanical properties increase first and then decrease with rotating speed increasing from 1 800 r/min to 2 200 r/min at welding speed of 140 mm/min. When the rotating speed is 2 000 r/min and the welding speed is 140 mm/min, good weld of 2519 alloy is achieved. The maximum tensile strength of the weld is 296 MPa and the fracture mode is ductile and brittle mixed fracture. Through optical microscope, scanning electron microscope and energy dispersive spectroscopy analysis, it can be concluded that the weld＇s tensile strength lower than that of base metal result from the microstructure difference and the bulky Cu-rich precipitation at grain boundary in the weld and the microstructure difference and the bulky Cu-rich precipitation at grain boundary are formed by the interaction of acute change of temperature and force.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第1期114-118,共5页
Journal of Central South University:Science and Technology
基金
国家"863"高技术计划项目(2002AA305402)
作者简介
周鹏展（1973-），男，湖南沅江人，博士研究生，从事搅拌摩擦焊接工艺及机理研究.论文联系人：周鹏展．男，博士研究生；电话；0731—8832676（H）；E-mail：zpz0731@163．com
