摘要
采用电子束流对Al-Mg-Li合金进行了焊接处理,研究了焊接工艺参数对Al-Mg-Li合金组织和力学性能的影响。结果表明,Al-Mg-Li合金母材中有沿轧制方向变形而拉长的晶粒,局部可见颗粒状Al3Li相;相同电子束流和焊接速度下,采用圆形扫描获得的焊接接头的室温拉伸性能要优于直线扫描焊接接头。当电子束流为7 mA,焊接速度为800 mm/min,采用圆形扫描方式时,合金焊接接头具有最高的抗拉强度、屈服强度和断后伸长率,断裂位置处于热影响区,此时焊缝区主要由α-Al,Al Li,Al2Mg Li,Al3Zr和Al3Li相组成,弥散分布的纳米级强化相(Al3Zr和Al3Li相)可以起到良好的析出强化作用。
The effect of welding parameters on the microstructure and mechanical properties of Al-Mg-Li alloy was studied.The results showed that there were grains deformed and elongated along the rolling direction in the base metal of Al-Mg-Li alloy, and granular Al3Li phase could be seen locally.Under the same electron beam current and welding speed, the room temperature tensile properties of welded joints obtained by circular scanning were better than those by linear scanning welding.The results showed that the suitable welding parameters of Al-Mg-Li alloy were: electron beam current 7 mA, welding speed 800 mm/min, circular scanning mode.At this time, the alloy welded joint had the maximum tensile strength, yield strength and elongation after fracture, and the fracture position was in the heat affected zone.At this time, the weld zone was mainly composed of α-Al, AlLi, Al2MgLi, Al3Zr and Al3Li phases, and the nano strengthening phases(Al3Zr and Al3Li) were dispersed phase which could play a good role in precipitation strengthening.
作者
唐威
郑峰
TANG Wei;ZHENG Feng(Shanxi Institute of Mechanical and Electrical Technology,Changzhi 046011,Shanxi pro.,China;Xi'anTechnological University,Xi'an 720021,Shaanxi pro.,China)
出处
《焊接技术》
2021年第4期21-24,I0007,共5页
Welding Technology
基金
山西省科技支持项目(18SX0971)。
