期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.01.042
关键词
Magnesium alloys; X-ray diffraction; Welding; Texture; Microstructure; Recrystallization
类别
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- AUTO21 Network of Centers of Excellence
- Premier's Research Excellence Award (PREA)
- NSERC-Discovery Accelerator Supplement (DAS) Award
- Canada Foundation for Innovation (CFI)
- Ryerson Research Chair (RRC) program
The structural application of ultra-lightweight magnesium alloys inevitably involves welding and joining. A solid-state welding - ultrasonic spot welding (USW) - was conducted on AZ31B-H24 Mg alloy sheet by varying a key parameter of welding energy in this study, aiming to identify the changes in the microstructure, crystallographic texture, and lap shear tensile strength. The grain size was observed to increase with increasing welding energy. Crystallographic texture determined via X-ray diffraction showed a significant change that corresponded well to the change in the deformation and recrystallization mechanisms of the Mg alloy. The lap shear strength first increased with increasing energy input, reached the maximum value at a welding energy of 2000 J, then decreased. The welds generally fractured along the joint interface when the welding energy was lower than 2000 J, while fracture occurred at the periphery of the joint (button pull-out) for the samples made with an energy input of higher than 2000 J. (C) 2013 Elsevier B.V. All rights reserved.
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