Weld microstructure and mechanical properties in ultrasonic enhanced friction stir welding of Al alloy to Mg alloy
Weld microstructure and mechanical properties in ultrasonic enhanced friction stir welding of Al alloy to Mg alloy
复制标题
铝合金-镁合金超声增强搅拌摩擦焊焊缝组织与力学性能
DOI：
10.1016/j.jmatprotec.2017.11.031
复制
发表时间：
2018-04-01
影响因子：
6.3
通讯作者：
Padhy, G. K.
中科院分区：
文献类型：
--
作者：
Lv, Xueqi;Wu, ChuanSong;Padhy, G. K.
对角向超声振动在搅拌摩擦焊中的应用进行了初步研究。研究了外加声场对焊接过程和焊缝性能的影响。在超声波的存在下，工艺温度升高，材料流动路径加宽，焊接界面处的机械互锁特征得到改善。金属间化合物的形态和分布的影响，在所有的旋转速度的附加振动。焊接界面处金属间化合物层的形成是由热输入驱动的。金属间化合物的组成大致不受影响，但层厚度通过附加的声场减小。超声波增强的焊缝机械性能的改善是显着的，在非常低的转速，但在较高的转速不太大。
A preliminary investigation was carried out into the application of angularly exerted ultrasonic vibrations in friction stir welding for the joining of AA 6061-T4 alloy to AZ31B at different tool rotation speeds. The variations in the welding process and weld properties due to the applied acoustic field were investigated. The process temperature was increased, the material flow path was widened and mechanical interlocking features at weld interfaces were improved in the presence of ultrasonics. Morphology and distribution of intermetallic compounds were influenced by the added vibrations at all rotation speeds. Formation of intermetallic layers at the weld interfaces was driven by heat input. Composition of the intermetallic compound was roughly unaffected but the layer thickness was reduced by the additional acoustic field. The ultrasonic enhanced improvement in weld mechanical properties was significant at very low rotation speeds but less substantial at higher rotation speeds.