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A. Gryguc S.K. Shaha H. Jahed M. Wells B. Williams J. McKinley

Abstract

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. KEYWORDS. AZ31B; Forging; Fatigue Characterization; Fracture; Texture.

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    How to Cite

    Gryguc, A., Shaha, S., Jahed, H., Wells, M., Williams, B. and McKinley, J. (2016) “Tensile and fatigue behaviour of as-forged AZ31B extrusion”, Frattura ed Integrità Strutturale, 10(38), pp. Pages 251–258. doi: 10.3221/IGF-ESIS.38.34.

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