On the Swift effect and twinning in a rolled magnesium alloy under free-end torsion

Guo, Xiaoqian; Wu, Wei; Wu, Peidong; Qiao, H.; An, Ke; Liaw, Peter K.

doi:10.1016/j.scriptamat.2013.05.010

Cited by 86 publications

(43 citation statements)

References 29 publications

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“…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]. Overall, the low-cycle fatigue life of the wrought Mg alloys increases with the decrease of strain amplitude, strain ratio and mean stress, as well as the increase of strain rate.…”

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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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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“…It has been demonstrated that the EVPSC model is able to predict mechanical behavior of polycrystalline materials at large strains (Guo et al [21] ; Jeong et al [22] ; Wang et al [23][24][25][26][27][28] ; Wu et al [29] ). The EVPSC model has been also used to study lattice strain evolutions in magnesium alloys.…”

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confidence: 99%

Study of Lattice Strain Evolution in Stainless Steel Under Tension: The Role of Self‐Consistent Plasticity Model

Guo

Wang

et al. 2015

steel research int.

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The recently developed large strain elastic visco-plastic self-consistent (EVPSC) model, with various popular self-consistent schemes including the Affine, Meff, Secant, and Tangent, is used to study the lattice strain evolution in a stainless steel under uniaxial tension. The material parameters for the various self-consistent schemes are fitted to experimental stress and strain curve under uniaxial tension. An assessment of the predictive capability of the self-consistent schemes is performed based on comparisons of the predicted lattice strain evolutions and in situ neutron diffraction measurements done on the same material. It is found that, among the self-consistent schemes examined, the self-consistent schemes with grain interaction stiffness halfway between those of the limiting Secant (stiff) and Tangent (compliant) approximations give the best results.

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“…This implies that the hardening parameters associated with the Pyramidal slip cannot be confidently determined from the uniaxial tension cases performed in the present study. However, it is also noted that during in-plane uniaxial compression of a rolled plate with strong basal texture, Pyramidal slip is very active at relatively large strains [4,19]. Thus, uniaxial compression allows us to confidently fit the material parameters associated with the Pyramidal slip system [25].…”

Section: Resultsmentioning

confidence: 99%

On twinning and anisotropy in rolled Mg alloy AZ31 under uniaxial tension

et al. 2016

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Abstract. The Elastic Visco-Plastic Self-Consistent (EVPSC) model, with the recently developed Twinning and DeTwinning (TDT) description, is applied to study the mechanical behaviour of hot-rolled Mg alloy AZ31 under uniaxial tension. Numerical results are compared to the experimental uniaxial tensile tests reported earlier by Chapuis et al. [29] for the out-of-plane directions of a thick plate along angles of α=0°, 30°, 45°, 60° and 90° between the normal direction and longitudinal specimen axis. It is shown that accounting for the initial texture and calibrating the EVPSC-TDT model by using uniaxial tension tests along the rolling direction and normal direction permits prediction of the strength anisotropy and strain hardening behavior along all five tensile directions, i.e. for cases in which the contribution of twinning is dominating, negligible or intermediate.

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On the Swift effect and twinning in a rolled magnesium alloy under free-end torsion

Cited by 86 publications

References 29 publications

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

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

Study of Lattice Strain Evolution in Stainless Steel Under Tension: The Role of Self‐Consistent Plasticity Model

On twinning and anisotropy in rolled Mg alloy AZ31 under uniaxial tension

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