Asymmetric Cyclic Deformation Behaviors of Hot-Rolled AZ91 Magnesium Alloy in Rolling Direction

Xiao Min Chen; Y.C. Lin; Zheng Hua Liu; Jian Chen

doi:10.4028/www.scientific.net/AMR.712-715.38

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Asymmetric Cyclic Deformation Behaviors of Hot-Rolled AZ91 Magnesium Alloy in Rolling Direction
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Asymmetric Cyclic Deformation Behaviors of Hot-Rolled AZ91 Magnesium Alloy in Rolling Direction

Abstract:

The cyclic deformation behaviors of hotrolled AZ91 magnesium alloy are studied by asymmetrical cyclic stresscontrolled experiments at room temperature. The ratcheting behavior and fatigue failure mechanism are discussed. Results show that: (1) The ratcheting strain increases sharply with the increase of cycle number at the initial stage, and then tends to be a constant after certain cycles. (2) The fatigue crack initiation and stable propagation regions are flat with lamellar structures, while the unstable propagation and rapid fracture regions are coarse with ductile dimples and tearing edges. (3) The residual twins can be seen as potential damage to fatigue failure of the material, due to its irreversibility of cyclic plastic deformation and damage to grain boundaries.