| 摘要: |
| 针对厚度为2.8 mm的1420铝锂合金进行搅拌摩擦焊接研究,了解搅拌摩擦焊工艺参数对接头组织和性能影响.结果表明,在优化焊接参数条件下,1420铝锂合金的搅拌摩擦焊接头抗拉强度和断后伸长率均能够达到母材的90%,并且较大的焊接热输入有利于进一步提高搅拌摩擦焊接头的强度系数.通过拉伸断口扫描及显微硬度观察,1420铝锂合金搅拌摩擦焊接头拉伸断口主要为准解理和韧窝断裂的复合断口,对比各个区域的显微硬度,焊缝区域硬度高于母材,且后退侧热力影响区硬度最高,而且搅拌摩擦焊接头中存在典型的"S"线特征。 |
| 关键词: 搅拌摩擦焊 铝锂合金 力学性能 微观组织 |
| DOI： |
| 分类号: |
| 基金项目:国家科技部"十一五"863高技术研究发展计划资助项目(2006BAF04B09);总装"十一五"预研项目(151318050116) |
|
| Mechanical properties of 1420 aluminum-lithium alloy friction stir welding |
|
GUO Xiaojuan, LI Guang, DONG Chunlin, LUAN Guohong
|
|
China FSW Center, Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China
|
| Abstract: |
| The friction stir welding of 2.8 mm thick 1420 aluminum-lithium alloy was conducted.The mechanical property and microstructure of the joints as well as the influences of welding parameters were investigated. The results show that if the welding parameters are optimal, the tensile property and elongation of the joints can reach to 90% that of the base metal, and the higher heat input could improve the mechanical properties.SIM and microhardness analysis indicate that fracture surface was characterized by main cleavage and dimples.Compared with other area, the hardness in weld was higher, and the highest area was in the center of the weld.The maximum is the TMAZ area at the retreating sides.The microstructure behaves the 'S' characteristic. |
| Key words: friction stir welding aluminum-lithium alloy mechanical property microstructure |
