Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 725, Issue -, Pages 398-405Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.04.017
Keywords
AZ61 magnesium alloy; Multi-pass friction stir processing; Tensile property; Microstructure; Anisotropy
Categories
Funding
- Research Fund for the Doctoral Program of Higher Education of China [20130172110044]
- Natural Science Foundation of Guangdong for Research Team [2015A030312003]
- Opening Project of Guangdong Key Laboratory for Advanced Metallic Materials Processing (South China University of Technology) [GJ201602]
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Premier's Research Excellence Award (PREA)
- NSERC-Discovery Accelerator Supplement (DAS) Award
- Canada Foundation for Innovation (CFI)
- Ryerson Research Chair (RRC) program
- China Scholarship Council (CSC)
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AZ61 magnesium alloy plate was prepared by multi-pass friction stir processing (M-FSP) with an overlapping ratio of 50%, and the microstructures and tensile properties of the M-FSP plate were studied with the tensile samples oriented in the processing direction (PD), transverse direction (TD) and 45 degrees to the PD. The large-scale MFSP AZ61 alloy plate was observed to be free of macro-defects. The grain size of as-cast AZ61 plate was significantly refined through FSP due to the presence of dynamic recrystallization. The subsequent passes could further refine the grain size of stir zones, while the periodic transition zones with non-uniform microstructures were present in the plate. Compared with the as-cast plate, an effective improvement in both strength and ductility was achieved in the M-FSP magnesium plate in both PD and TD because of the grain refinement and the elimination of cast defects. While the ductility was lower in the samples oriented along 45 degrees to the PD, the strength was also higher than that of the as-cast plate. The orientation dependence of the tensile properties of MFSP AZ61 magnesium plate was mainly attributed to the local non-uniform microstructure and texture.
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