Fatigue properties of rolled magnesium alloy (AZ31) sheet: Influence of specimen orientation

Lv, F.; Yang, Fei; Duan, Qingling; Yang, Yingjie; Wu, Shengwei; Li, S.X.; Zhang, Z.F.

doi:10.1016/j.ijfatigue.2010.10.013

Cited by 95 publications

(68 citation statements)

References 39 publications

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“…As seen from Figure 4, relatively weaker textures (with a maximum intensity of 2.1 multiples of random distribution (MRD) for the asextruded, 3.3 MRD for the T5, and 4.5 MRD for the T6 samples were observed after the defocusing correction, in comparison with the extruded AM30 [14] and rolled AZ31. [63] This was basically in agreement with the study by Liu et al, [52] where the intensity of the T5 and T6 textures was stronger than that of the extruded alloy. The presence of such weaker textures in the RE-Mg alloy was a major benefit of adding RE elements into Mg alloys, as also reported by Stanford and Barnett [64] who observed that microalloying with RE elements could weaken texture in the forming process.…”

Section: Resultssupporting

confidence: 91%

“…The fatigue life (i.e., the number of cycles to failure, N f ) as a function of the applied total strain amplitudes De t =2 ð Þ of the GW103K alloy in the as-extruded, T5, and T6 states is shown in Figure 9, along with the experimental data reported in the literature for various extruded Mg alloys [11,12,17,63,[73][74][75] for comparison. The Fig.…”

Section: E Fatigue Life and Fatigue Parametersmentioning

confidence: 99%

“…Overall, the alloy basically showed an improved fatigue life than the RE-free extruded Mg alloys. [11,12,63,[73][74][75] Based on the Basquin's equation and Coffin-Manson relation and as described in References 10, 12, 13, 70, 76, 77, the total strain amplitude could be expressed as two parts of elastic strain amplitude and plastic strain amplitude, i.e.,…”

Section: E Fatigue Life and Fatigue Parametersmentioning

confidence: 99%

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Cyclic Deformation Behavior of a Rare-Earth Containing Extruded Magnesium Alloy: Effect of Heat Treatment

Mirza

Chen

et al. 2014

Metall Mater Trans A

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The present study was aimed at evaluating strain-controlled cyclic deformation behavior of a rareearth (RE) element containing Mg-10Gd-3Y-0.5Zr (GW103K) alloy in different states (as-extruded, peak-aged (T5), and solution-treated and peak-aged (T6)). The addition of RE elements led to an effective grain refinement and weak texture in the as-extruded alloy. While heat treatment resulted in a grain growth modestly in the T5 state and significantly in the T6 state, a high density of nano-sized and bamboo-leaf/plate-shaped b¢ (Mg 7 (Gd,Y)) precipitates was observed to distribute uniformly in the a-Mg matrix. The yield strength and ultimate tensile strength, as well as the maximum and minimum peak stresses during cyclic deformation in the T5 and T6 states were significantly higher than those in the as-extruded state. Unlike RE-free extruded Mg alloys, symmetrical hysteresis loops in tension and compression and cyclic stabilization were present in the GW103K alloy in different states. The fatigue life of this alloy in the three conditions, which could be well described by the Coffin-Manson law and Basquin's equation, was equivalent within the experimental scatter and was longer than that of RE-free extruded Mg alloys. This was predominantly attributed to the presence of the relatively weak texture and the suppression of twinning activities stemming from the fine grain sizes and especially RE-containing b¢ precipitates. Fatigue crack was observed to initiate from the specimen surface in all the three alloy states and the initiation site contained some cleavage-like facets after T6 heat treatment. Crack propagation was characterized mainly by the characteristic fatigue striations.

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Section: Resultssupporting

confidence: 91%

Section: E Fatigue Life and Fatigue Parametersmentioning

confidence: 99%

Section: E Fatigue Life and Fatigue Parametersmentioning

confidence: 99%

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Cyclic Deformation Behavior of a Rare-Earth Containing Extruded Magnesium Alloy: Effect of Heat Treatment

Mirza

Chen

et al. 2014

Metall Mater Trans A

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“…Comprehensive studies have concentrated on the effects of strain amplitude [23][24][25], mean stress [26][27][28], strain ratio [8,9,28,29], strain rate [29], microstructure [8,30,31], grain size [32,33], rare earth elements [34,35], hysteresis energy [26], heat-treatment [36], temperature [5], environment [37,38] and initial texture [39][40][41][42] on the fully reversed strain-controlled low-cycle fatigue behavior of the wrought Mg alloys. Moreover, in the last decade, progress has been made in theoretical modeling to predict the slip, twinning, and detwinning behavior in the hcp-structured material during strain-path changes and cyclic loading [11,22,39,[43][44][45][46][47].…”

Section: Introductionmentioning

confidence: 99%

Unraveling cyclic deformation mechanisms of a rolled magnesium alloy using in situ neutron diffraction

Liaw

2015

Acta Materialia

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In the current study, the deformation mechanisms of a rolled magnesium alloy were investigated under cyclic loading using real-time in situ neutron diffraction under a continuous-loading condition. The relationship between the macroscopic cyclic deformation behavior and the microscopic response at the grain level was established. The neutron diffraction results indicate that more and more grains are involved in the twinning and detwinning deformation process with the increase of fatigue cycles. The residual twins appear in the early fatigue life, which is responsible for the cyclic hardening behavior. The asymmetric shape of the hysteresis loop is attributed to the early exhaustion of the detwinning process during compression, which leads to the activation of dislocation slips and rapid strain-hardening. The critical resolved shear stress for the activation of tensile twinning closely depends on the residual strain developed during cyclic loading. In the cycle before the sample fractured, the dislocation slips became active in tension, although the sample was not fully twinned. The increased dislocation density leads to the rise of the stress concentration at weak spots, which is believed to be the main reason for the fatigue failure. The deformation history greatly influences the deformation mechanisms of hexagonal-close-packed-structured magnesium alloy during cyclic loading.

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“…Recently, there have been a number of researches on the strain-controlled low cycle fatigue (LCF) behavior of magnesium alloys [10][11][12][13][14][15][16], showing that loading path or texture exerts an evident effect. It was found that the fatigue deformation of textured magnesium alloys is dominated by the alternation of {10-12}/10-11S extension twinning and detwinning during each cycle, and the twinning-detwinning process plays an important role in determining the fatigue behavior [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Low cycle fatigue behavior of the textured AZ31B magnesium alloy under the asymmetrical loading

Geng

et al. 2013

Materials Science and Engineering: A

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Fatigue properties of rolled magnesium alloy (AZ31) sheet: Influence of specimen orientation

Cited by 95 publications

References 39 publications

Cyclic Deformation Behavior of a Rare-Earth Containing Extruded Magnesium Alloy: Effect of Heat Treatment

Cyclic Deformation Behavior of a Rare-Earth Containing Extruded Magnesium Alloy: Effect of Heat Treatment

Unraveling cyclic deformation mechanisms of a rolled magnesium alloy using in situ neutron diffraction

Low cycle fatigue behavior of the textured AZ31B magnesium alloy under the asymmetrical loading

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