Microstructural characterization and mechanical performance of Al–Cu–Li alloy electron beam welded joint
作者： Li Zhao , Shaogang Wang , Yang Jin , Yuan Chen
DOI: 10.1016/J.AST.2018.08.030
关键词: Alloy 、 Electron beam welding 、 Microstructure 、 Joint (geology) 、 Welding 、 Fracture (geology) 、 Ultimate tensile strength 、 Composite material 、 Equiaxed crystals 、 Materials science
摘要: Abstract Al–Cu–Li alloy with the thickness of 4 mm is welded by electron beam welding (EBW). Microstructure and mechanical properties joint are systematically investigated. The formation mechanism weld porosity fully discussed. Orthogonal experiment results show that parameters have great effect on generation gas pore, speed main factor affecting porosity, followed scanning mode, current minimal one. analysis demonstrates weldment mainly equiaxed grains, some dendrites exist too. Mechanical joints indicate that, under following parameters, 13 mA, 600 mm/min, circular scanning, a good performance can be obtained. Tensile strength 368.4 MPa, which about 68% base metal (BM). SEM shows there many fine dimples distributed fracture surface joint, it obviously presents characteristic ductile fracture.
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