Study on cyclic deformation behavior of extruded Mg–3Al–1Zn alloy

Chen, Cheng; Liu, Tianmo; Lv, Chengling; Lu, Lidan; Luo, Dongzhi

doi:10.1016/j.msea.2012.01.084

Cited by 22 publications

(12 citation statements)

References 25 publications

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“…Figure 5 shows the total energy versus the life curve for AZ31B over a range of fatigue lives. Also shown are fatigue values reported in the literature [7,8,10,15,14]. It is evident that the total energy-life curve correlates fatigue data very well in both low and high cycle fatigue regimes.…”

Section: Energy-based Fatigue Model For Az31bmentioning

confidence: 63%

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An asymmetric elastic–plastic analysis of the load-controlled rotating bending test and its application in the fatigue life estimation of wrought magnesium AZ31B

Kalatehmollaei

Mahmoudi-Asl

Jahed

2014

International Journal of Fatigue

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Due to different deformation mechanisms arising from limited slip systems in HCP wrought magnesium alloys, their yield and hardening in tension and compression are different. Consequently, the cyclic behavior of these alloys is asymmetric showing a non-Masing hysteresis. An elastic-plastic method of analysis is proposed in this paper to handle the pronounced asymmetry inherited by Mg wrought alloys. Samples machined from an extrusion piece of AZ31B were tested on a standard rotating bending machine at bending moment amplitudes ranging from 3.3 to 6.3 N·m. Tests were conducted under two conditions: as-extruded and stress-relived. As-extruded samples showed a higher fatigue limit due to beneficial residual stresses induced by the extrusion process. The proposed elasticplastic model was then applied to obtain the stress distribution in the tested specimens. Cyclic hystereses obtained from this analysis were used to estimate the elastic and plastic strain energy densities per cycle. An energy-life model for AZ31B was then employed in conjunction with the calculated hysteresis energies to predict fatigue life of AZ31B in rotating bending. The proposed model prediction results were in good agreement with the experimental results.

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Section: Energy-based Fatigue Model For Az31bmentioning

confidence: 63%

“…Various researchers have proposed energy as a suitable parameter to correlate and estimate the fatigue life of magnesium [3,7,8,10,14,15]. Most of these studies focused on the low cycle fatigue regime.…”

Section: Energy-based Fatigue Model For Az31bmentioning

confidence: 99%

An asymmetric elastic–plastic analysis of the load-controlled rotating bending test and its application in the fatigue life estimation of wrought magnesium AZ31B

Kalatehmollaei

Mahmoudi-Asl

Jahed

2014

International Journal of Fatigue

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“…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. The strong texture leads to a strong tension-compression asymmetry in deformation [3][4][5][6][7] and is detrimental for fatigue performance.…”

Section: Introductionmentioning

confidence: 99%

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

Васильев

Linderov

Nugmanov

et al. 2015

Metals

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Abstract:Fatigue properties under axisymmetric push-pull loading of a magnesium alloy Mg-6Zn-0.5Zr (ZK60) after processing by multiaxial isothermal forging (MIF) to a total strain of 4.2 at 400 °C were investigated. The strong influence of the microstructure on the mechanical behavior is demonstrated. Hot severe plastic deformation was shown effective in improving the fatigue life in both the high-and low-cyclic regimes.

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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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Study on cyclic deformation behavior of extruded Mg–3Al–1Zn alloy

Cited by 22 publications

References 25 publications

An asymmetric elastic–plastic analysis of the load-controlled rotating bending test and its application in the fatigue life estimation of wrought magnesium AZ31B

An asymmetric elastic–plastic analysis of the load-controlled rotating bending test and its application in the fatigue life estimation of wrought magnesium AZ31B

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

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

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