摘要
采用搅拌摩擦焊对1460铝锂合金进行焊接,研究合金的焊接性能和焊后热处理工艺。运用显微硬度测试和拉伸力学性能测试表征焊缝力学性能;用扫描电镜、透射电镜对焊缝组织进行观察。结果表明:焊前对合金进行固溶和时效处理导致焊缝的抗拉强度降低;焊前未进行热处理的焊缝样品抗拉强度为320 MPa,与母材相当;焊后的固溶+160℃/40h时效处理使焊核区重新析出θ′(Al2Cu)和T1(Al2CuLi)相,焊缝的抗拉强度提高了75 MPa;焊缝拉伸断裂发生在热机械影响区,断裂方式由韧性断裂转变为解理断裂。
In this study,the technology of friction-stir welding of 1460 Al-Li alloy were investigated,including the mechanical properties of weld seam and the post weld heat treatments. The corresponding microstructure and mechanical properties of the weld seam were studied by means of optical microscope,scanning electron microscope,transmission electron microscope,hardness test and tensile test. Pre-weld heat treatments(aging and solution treatment)lead to the decrease of the tensile strength of the weld. The tensile strength of the weld is 320 MPa,which is equivalent to the base metal. The post-welding heat treatment(solution treated +160 ℃/40 h aging)leads to the precipitation of θ′(Al2 Cu)and T1(Al2 CuLi)observed by the transmission electron microscopy(TEM),as a result the tensile strength of the weld increased by another 75 MPa. The fracture of the weld occurs at the thermo-mechanically-affected zone,the fracture behavior of the weld changes from ductile fracture to cleavage fracture as it is post weld heat treated(aged or solution treated).
作者
马娟
闫德胜
戎利建
MA Juan;YAN Desheng;RONG Lijian(Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;Chengdu University,Chengdu 610106,China)
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2020年第1期96-101,共6页
Ordnance Material Science and Engineering
