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Indexed by:期刊论文

Date of Publication:2009-05-15

Journal:MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

Included Journals:SCIE、EI

Volume:507

Issue:1-2

Page Number:22-28

ISSN No.:0921-5093

Key Words:Fracture; Microcracks; Laser welded bonding

Abstract:The fracture of the laser welded bonding (LWB) Mg to Al alloy joint was analyzed. In order to find the cracks source, the microcracks in LWB fusion zone were observed by scanning electron microscopy (SEM), comparing with that in the laser welding joint. The formation of the microcracks in LWB Mg to Al joint was discussed simply. The addition of the adhesive reduced the temperature contrast between the Mg-Al eutectic phase and the intermetallics. Thus, the stress concentration at the interface between the Mg-Al eutectic phase and the intermetallics was released. With the effect of the adhesion, the tensile shear test specimen of LWB joint was failed at the edge of the joint, the property of which was better than that of laser welding and adhesive bonding. (C) 2008 Elsevier B.V. All rights reserved.