Issue 38

A. Gryguc et al, Frattura ed Integrità Strutturale, 38 (2016) 251-258; DOI: 10.3221/IGF-ESIS.38.34 251 Focussed on Multiaxial Fatigue and Fracture Tensile and fatigue behaviour of as-forged AZ31B extrusion A. Gryguc, S.K. Shaha, H. Jahed University of Waterloo (Department of Mechanical & Mechatronics Engineering, 200 University Ave W, Waterloo, ON N2L 3G1, CANADA) agryguc@uwaterloo.ca , skumarshaha@uwaterloo.ca, hjahed@uwaterloo.ca https://uwaterloo.ca/fatigue-stress-analysis-lab/ M. Wells University of Waterloo (Department of Mechanical & Mechatronics Engineering, 200 University Ave W, Waterloo, ON N2L 3G1, CANADA) mawells@uwaterloo.ca https://uwaterloo.ca/mechanical-mechatronics-engineering/people-profiles/mary-wells B. Williams, J. McKinley CanmetMATERIALS (Natural Resources Canada, 183 Longwood Road South, Hamilton, ON L8P 0A1, Canada) Bruce.Williams@nrcan-rncan.gc.ca , Jonathan.McKinley@NRCan-RNCan.gc.ca http://www.nrcan.gc.ca/mining-materials/materials-technology/8234 A BSTRACT . Tensile and stress controlled fatigue tests were performed to investigate the influence of forging at a temperature of 400°C at different rates, on the performance of extruded AZ31B magnesium alloy. The obtained microstructural analysis showed that the extruded AZ31B magnesium alloy possesses a bimodal grain structure with strong basal texture. In contrast, the forged samples showed refined grains and a weaker texture. During tensile testing, a maximum yield and ultimate tensile strength of about 163 MPa and 268 MPa were obtained for the forged samples showing an increase of 102% and 7%, respectively from the as-extruded material. At the same time, a significant improvement of fatigue life was also observed for the sample forged at the rate of 100 mm/min. The fractographic analysis of the fracture surfaces showed that ductile type fractures occurred in both as-extruded and forged samples. However, more dimples and plastic deformation were identified in the fracture surfaces of the forged specimens. It is believed that forging improved the fatigue life by a combination of grain refinement and texture modification resulting in improved yield and ductility. K EYWORDS . AZ31B; Forging; Fatigue Characterization; Fracture; Texture. Citation: Gryguc, A., Shaha, S.K., Jahed, H., Wells, M., Williams, B., McKinley, J., Tensile and fatigue behaviour of as-forged AZ31B extrusion, Frattura ed Integrità Strutturale, 38 (2016) 251-258. Received: 13.05.2016 Accepted: 23.06.2016 Published: 01.10.2016 Copyright: © 2016 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.