焊接速度及焊后时效处理对Al-Cu-Mg-Ag合金电子束焊接接头性能的影响  

Effects of Welding Speed and Post-weld Aging Treatment on the Properties of Electron Beam Welded Al-Cu-Mg-Ag Alloy

作　　者：李俊霖[1] 刘志义[1] 泊松[1] 王建[1] 应普友[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《矿冶工程》2017年第3期144-147,共4页Mining and Metallurgical Engineering

摘　　要：通过拉伸测试、扫描电镜(SEM)、能谱分析(EDS)、透射电镜(TEM)和金相显微镜(OM)等手段,研究了焊接速度以及焊后时效处理对Al-Cu-Mg-Ag合金电子束焊接接头性能的影响。结果表明:随焊接速度提高,焊接接头强度呈先上升后下降的趋势,并在焊接速度1 200 mm/min时获得最大值358 MPa;焊后时效处理可以提升焊接接头抗拉强度,其中焊接速度为1 200 mm/min时的焊接接头抗拉强度最大,可达412 MPa,为母材强度的77.6%。焊后时效合金性能的提高主要得益于θ'和X相的析出,而焊缝熔合区晶界处Cu元素的偏析抑制了Ω相的析出。Effects of welding speed and post-weld aging treatment on the properties of electron beam welded Al-Cu-MgAg alloy were investigated by tensile testing,scanning electron microscopy（SEM）,energy dispersive spectroscopy（EDS）,transmission electron microscope（TEM） and optical microscopy（OM）. Results showed that with the increasing of welding speed,the tensile strength showed a downward trend after an initial rise,reaching the maximum（358 MPa） at the welding speed of 1 200 mm/min. It is also found that the tensile strength of welding joints was enhanced by a post-weld aging treatment,up to the maximum（412 MPa） at the welding speed of 1 200 mm/min,approaching 77.6%of the strength of base metal. This enhancement was mainly attributed to the formation of θ＇ and X phases,as well as the suppression of Ω-phase precipitation by Cu segregation at grain boundaries.

关 键 词：AL-CU-MG-AG合金 电子束焊接 焊接速度 时效处理 X相 焊接接头 

分 类 号：TG156[金属学及工艺—热处理]