Analysis of fatigue damage process in magnesium alloy AZ31

Fatigue Performance of Mg-Zn-Zr Alloy Processed by Hot Severe Plastic Deformation

“…However, in the fine-grain alloy it is slightly higher than in the coarse-grain one. The mean stress is regularly observed in Mg alloys during the strain-controlled fatigue test [1][2][3], which is supposed to be produced by a combined effect of cyclic hardening in tension and easy yielding in compression [3] caused by the polar nature of twinning. Mechanical twinning is also a root cause of the concavity of the hysteresis loop, which is noticeable in Figure 4 for both alloy conditions tested at a larger strain amplitude.…”

“…Although the fatigue behavior of Mg alloys apparently depends on these factors, the improvement of fatigue properties through microstructure control is tricky because, among the above-listed ones, it is hard to identify those which have most influence on the fatigue behavior. For example, the authors of [2] hardly identify the governing structure parameter(s) of the fatigue life of the as-extruded AZ31 Mg alloy, which is only slightly longer than that of its annealed counterpart at identical strain amplitudes. Moreover, usually processing via rolling or pressing results in a strong crystallographic texture where the c-axis of the majority of the grains is perpendicular to the longitudinal axis of the product.…”

Fatigue characterization and modeling of AZ31B magnesium alloy spot-welds

“…It is therefore essential to examine the merits of components made of Mg under both static and cyclic loads. Wrought Mg alloys in general have superior mechanical properties compared to cast alloys [3,4]. Therefore, wrought alloys are widely investigated as an alternative material for load-bearing automobile parts.…”

Fatigue Crack Propagation Behavior of Textured Polycrystalline Magnesium Alloys

“…On the other hand, basal planes are distributed parallel to the extrusion direction by extrusion. Depending on their texture, wrought magnesium alloys show unique deformation behavior such as mechanical anisotropy, [2][3][4] pseudoelasticity in compression and tension loading-unloading, [4][5][6][7][8] and asymmetricity of stress-strain hysteresis loops in strain controlled low-cycle fatigue tests [9][10][11][12][13][14] and even in load controlled high-cycle fatigue tests, 4,9) etc. The orientation dependence of fatigue crack propagation behavior of magnesium single crystals, [15][16][17] and the effect of grain size [18][19][20][21] and texture [22][23][24][25] on fatigue properties of polycrystalline magnesium alloys have been reported in previous works.…”