Mechanical Response Behavior of an Extruded Mg-8.0Al-0.1Mn Magnesium Alloy Under Various Loading Paths and Strain Rates
XIA Erli1, YE Tuo1, QIU Sawei1, GUO Pengcheng1,2,*, WU Yuanzhi1, LI Luoxing2,3
1 School of Intelligent Manufacturing and Mechanical Engineering, Hunan Institute of Technology, Hengyang 421002, Hunan, China 2 Research Institute of Hunan University in Chongqing, Hunan University, Chongqing 400044, China 3 State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle, Hunan University, Changsha 410082, China
Abstract: The mechanical behaviors of the extruded Mg-8.0Al-0.1Mn alloys under different loading paths and various strain rates were investigated by quasi-static compression. The applied strain rates were 0.000 1 s-1, 0.001 s-1, 0.01 s-1, 0.1 s-1 and 0.33 s-1, and the compression loadings were performed along extrusion direction(ED) and transverse direction(TD). Before compression tests, the alloys were solution treated at 350 ℃ for 6 h and 410 ℃ for 6 h, respectively. The results confirmed a strong anisotropy of the mechanical behavior of extruded Mg-8.0Al-0.1Mn magnesium alloy. The stress-strain curves of the alloys subjected to compression loaded along TD showed a “C” shape with different types of serrated fluctuations at a specific strain rate, while the stress-strain curves of compression along ED showed an “S” shape with severe serrated fluctuations occurring only at the plastic instability stage. The reductions in the applied strain rate and the grain size resulted in more significant Portevin-Le Chatelier(PLC). At the loading strain rate of 0.000 1 s-1, the PLC serration gradually transformed from A-type to B-type and finally to C-type with the increase of loading strain. After compression along ED, the grains were still approximately equiaxed, and several sets of parallel deformation twins could be observed. And the compression along TD led to a set of parallel deformation twins, and also the formation of another set of twins intersecting with the former in some grains. The alloy showed a relatively low ability of coordinated deformation when compressed along TD, thereby the rotations of grain boundaries and twin boundaries were required to coordinate deformation, resulting in obvious distortion of grains and twins.
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2024, Vol. 38 
