摘要
通过金相分析、拉伸、弯曲及硬度测试等方法研究了5083/5052异种铝合金搅拌摩擦焊接头组织及力学性能。结果表明:焊核区组织为细小等轴晶组织;热影响区组织仅受到热循环作用,与母材5052铝合金组织类似,但有粗化现象;热机影响区在搅拌针机械挤压和热循环的双重作用下,组织发生梯度变化,混合有再结晶晶粒和回复晶粒。接头平均抗拉强度和伸长率达到214.7 MPa、21.2%,与5052铝合金母材的(213 MPa、21.3%)相近。面弯和背弯180°时,试样无裂纹产生。接头硬度的分布呈"W"型,焊核区硬度分布较均匀,硬度最低值出现在热机影响区。
The microstructure and mechanical property of friction stir welded joints of 5083/5052 dissimilar aluminum alloy were investigated by metallographic analysis, room-temperature tensile, bending and hardness tests. The results show that the microstructure in weld nugget consists of refined, equiaxed grains. The microstructure in HAZ and TWAZ consists of highly deformed grains. The microstructure in HAZ is only affected from thermal cycling, which is similar to that in base metal, but coarse grains is witnessed. Bearing stirring needle mechanical extrusion and heat affect, the microstructure in TWAZ appears gradient change and recrystallization grains mixed with recovery grains. The mean tensile strength and elongation of the joints can reach 214.7MPa and 21.2%, which are close to those of 5052 aluminum alloy（the values are 213 MP and 21.3%）.When the angle of face bending and back bending is 180°, there is no crack in sample.The hardness distribution of joint presents ＂W＂ shape, the hardness distribution in weld nugget is uniform,and the lowest hardness appears in TMAZ.
出处
《热加工工艺》
CSCD
北大核心
2016年第11期236-238,241,共4页
Hot Working Technology
关键词
异种合金
搅拌摩擦焊
组织
抗拉强度
弯曲
硬度
dissimilar aluminum alloy
friction stir welding
microstructure
tensile strength
bending
hardness
