Effect of Forging on Microstructure, Texture and Compression Behavior of Extruded AZ31B
Forging is a common method employed in the fabrication of automotive components. In this study, extruded AZ31B magnesium alloy was semi-close die forged at a temperature of 500 °C with a ram rate of 40 mm/s. Microstructural study indicated a bimodal grain structure with weaker texture in the forged material compared to the as-extruded material. Uniaxial compression tests indicated a remarkable improvement of fracture strain from 36 to 61% with a reduction of ultimate compressive strength between 4 and 22% in the forged samples compared to the as-extruded samples. It is attributed to the modification of microstructure and texture decreases twinning and increases the slipping activity resulting the improvement of ductility and reduced strength at room temperature.
KeywordsForging Extrusion Microstructure Texture Compression
The financial support of the Natural Sciences and Engineering Research Council of Canada (NSERC) through the Automotive Partnership Canada (APC) program under APCPJ 459269–13 grant with contributions from Multimatic Technical Centre, Ford Motor Company, and Centerline Windsor are acknowledged. The authors would also like to thank L. Blaga of CanmetMATERIALS, Hamilton for forging trials and, G. Yu for design of the forging die and Dr. Y. Ding of the University of Waterloo for assistance with SEM and OM.
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