Effects of extrusion ratio on the ratcheting behavior of extruded AZ31B magnesium alloy under asymmetrical uniaxial cyclic loading

Zhang, X.P.; Castagne, Sylvie; Luo, Xuan; Gu, C.F.

doi:10.1016/j.msea.2010.10.016

Cited by 27 publications

(7 citation statements)

References 21 publications

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“…It has been established that the twinning-detwinning process dominates plastic deformation at higher strain amplitudes, whereas dislocation slips dominate the plastic deformation at lower strain amplitudes [26][27]39]. Experimental investigations reveal that the fatigue resistance and cyclic response are affected by various factors, including loading path [17,22,[30][31], strain rate [9,35], microstructure and texture [3,[10][11][12][13][14]16,[19][20]24,28,32,45], and stress ratio [6,34,43]. However, most studies concerning the fatigue behavior of Mg alloys are carried out by applying symmetric cyclic loading (fully reversed strain-or stress-controlled).…”

Section: Introductionmentioning

confidence: 99%

Cyclic deformation and fatigue of extruded AZ31B magnesium alloy under different strain ratios

Xiong

Jiang

2016

Materials Science and Engineering: A

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Cyclic deformation and fatigue behavior of extruded AZ31B magnesium (Mg) alloy were investigated under strain-controlled loading along the extrusion direction at different strain amplitudes with three strain ratios (ε = 1,). With a strain ratio of ε = , partial twinning-partial detwinning occurs at all strain amplitudes, leading to accumulation of deformation twins as the loading cycle is increased. With strain ratios being ε = and 1, partial twinning-complete detwinning is the cyclic deformation mechanism when the strain amplitude is higher than 0.35%. At a strain amplitude lower than 0.35%, dominant cyclic deformation mechanism is dislocation slips irrespective of the strain ratio. Compared with the cases of ε = and ε = , stronger cyclic hardening is exhibited at all the investigated strain amplitudes for ε =. Fatigue fracture surfaces show regions with lamellar-like and dimplelike features. Lamellar-like feature existing in the crack initiation and stable propagation region are mainly due to twinning-detwinning during cyclic deformation. The dimple-like feature formed in the unstable crack propagation and final rupture region mainly arises from severe intragranular plastic deformation by dislocation slips. At the same strain amplitude, the lamellar-like traces become more aggravated with a lower stain ratio. The strain-fatigue life curves exhibit a distinguishable kink at strain ratios ε = 1 and. The fatigue life with ε = shows the highest and that with is the lowest at the same strain amplitude. The Smith-Watson-Topper (SWT) fatigue criteria can correlate well the fatigue experiments of AZ31B Mg alloy under different strain ratios.

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Section: Introductionmentioning

confidence: 99%

Cyclic deformation and fatigue of extruded AZ31B magnesium alloy under different strain ratios

Xiong

Jiang

2016

Materials Science and Engineering: A

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“…In the last decade, investigations were made to understand the cyclic deformation behavior and low-cycle fatigue (LCF) of different wrought Mg alloys. The Mg alloys studied include extruded AZ31 [18][19][20][21][22][23][24][25][26][27][28][29][30][31], extruded AZ31B [32][33][34][35][36][37][38][39][40][41][42], extruded AZ61 [43][44][45][46][47][48][49][50], extruded ZK60 [51][52][53][54][55], rolled AZ31 [56][57][58][59][60][61][62][63], rolled AZ31B [64][65], rolled AZ91 [66]…”

Section: Introductionmentioning

confidence: 99%

Cyclic deformation and fatigue of extruded ZK60 magnesium alloy with aging effects

Dong

Jiang

Dong

et al. 2014

Materials Science and Engineering: A

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Monotonic and fully reversed strain-controlled cyclic deformation experiments were conducted on a ZK60 magnesium (Mg) alloy in as-extruded and T5 aged conditions in ambient air. It was observed that the aging process had a significant influence on the stress-strain response and the fracture stress and strain under both monotonic tension and monotonic compression but a marginal influence on the stabilized cyclic deformation and fatigue of the material. An Electron Backscatter Diffraction (EBSD) analysis revealed that double twins were formed under a large compression strain in the as-extruded Mg but were not observed in the aged state under monotonic compression. A kink point in the strain-life fatigue curve demarcates the influence of twinning-detwinning deformation on fatigue. No twinning occurred throughout the fatigue life of the material when the strain amplitude was lower than the kink point value. With a strain amplitude slightly above the kink point, twinning-detwinning occurred but the process diminished as the loading cycle increased. The aging process enhanced the kink point slightly from a strain amplitude of 0.32% to 0.35%. Only small amount residual twins were observed in the material after fatigue loading when the strain amplitudes were lower than 4%.

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“…This phenomenon has rarely been reported in similar modeling studies. stress free [37] 400 MPa (medium extrusion) [38] 600 MPa (high extrusion) [38] 1 2 3 4 5 Fig. 7.…”

Section: Resultsmentioning

confidence: 99%

Effect of elastic strain energy on grain growth and texture in AZ31 magnesium alloy by phase-field simulation

Wang

Jin

et al. 2017

Chinese Phys. B

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A phase-field model is modified to investigate the grain growth and texture evolution in AZ31 magnesium alloy during stressing at elevated temperatures. The order parameters are defined to represent a physical variable of grain orientation in terms of three angles in spatial coordinates so that the grain volume of different order parameters can be used to indicate the texture of the alloy. The stiffness tensors for different grains are different because of elastic anisotropy of the magnesium lattice. The tensor is defined by transforming the standard stiffness tensor according to the angle between the (0001) plane of a grain and the direction of applied stress. Therefore, different grains contribute to different amounts of work under applied stress. The simulation results are well-explained by using the limited experimental data available, and the texture results are in good agreement with the experimental observations. The simulation results reveal that the applied stress strongly influences AZ31 alloy grain growth and that the grain-growth rate increases with the applied stress increasing, particularly when the stress is less than 400 MPa. A parameter (∆d) is introduced to characterize the degree of grain-size variation due to abnormal grain growth; the ∆d increases with applied stress increasing and becomes considerably large only when the stress is greater than 800 MPa. Moreover, the applied stress also results in an intensive texture of the 0001 axis parallel to the direction of compressive stress in AZ31 alloy after growing at elevated temperatures, only when the applied stress is greater than 500 MPa.

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Effects of extrusion ratio on the ratcheting behavior of extruded AZ31B magnesium alloy under asymmetrical uniaxial cyclic loading

Cited by 27 publications

References 21 publications

Cyclic deformation and fatigue of extruded AZ31B magnesium alloy under different strain ratios

Cyclic deformation and fatigue of extruded AZ31B magnesium alloy under different strain ratios

Cyclic deformation and fatigue of extruded ZK60 magnesium alloy with aging effects

Effect of elastic strain energy on grain growth and texture in AZ31 magnesium alloy by phase-field simulation

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