Dynamic recrystallisation and the development of microstructure during the high temperature deformation of magnesium

Ion, Sue; Humphreys, F.J.; White, S. H.

doi:10.1016/0001-6160(82)90031-1

Cited by 804 publications

(414 citation statements)

References 15 publications

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“…Non-basal dislocations, including hc + ai ones, have been often reported as necessary accommodation for deformation in regimes of high stress concentration (Ion et al, 1982;Koike et al, 2003;Armstrong and Walley, 2008). However, the net contribution of second-order pyramidal hc + ai slip to the macroscopic strain in Mg alloys has been controversial for decades.…”

Section: Introductionmentioning

confidence: 99%

Continuum modeling of the response of a Mg alloy AZ31 rolled sheet during uniaxial deformation

Fernández

Prado

Wei

et al. 2011

International Journal of Plasticity

104

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a b s t r a c tLightweight magnesium alloys, such as AZ31, constitute alternative materials of interest for many industrial sectors such as the transport industry. For instance, reducing vehicle weight and thus fuel consumption can actively benefit the global efforts of the current environmental industry policies. To this end, several research groups are focusing their experimental efforts on the development of advanced Mg alloys. However, comparatively little computational work has been oriented towards the simulation of the micromechanisms underlying the deformation of these metals. Among them, the model developed by Staroselsky and Anand [Staroselsky, A., Anand, L., 2003. A constitutive model for HCP materials deforming by slip and twinning: application to magnesium alloy AZ31B. International Journal of Plasticity 19 (10), 1843-1864] successfully captured some of the intrinsic features of deformation in Magnesium alloys. Nevertheless, some deformation micromechanisms, such as cross-hardening between slip and twin systems, have been either simplified or disregarded. In this work, we propose the development of a crystal plasticity continuum model aimed at fully describing the intrinsic deformation mechanisms between slip and twin systems. In order to calibrate and validate the proposed model, an experimental campaign consisting of a set of quasi-static compression tests at room temperature along the rolling and normal directions of a polycrystalline AZ31 rolled sheet, as well as an analysis of the crystallographic texture at different stages of deformation, has been carried out. The model is then exploited by investigating stress and strain fields, texture evolution, and slip and twin activities during deformation. The flexibility of the overall model is ultimately demonstrated by casting light on an experimental controversy on the role of the pyramidal slip hc + ai versus compression twinning in the late stage of polycrystalline deformation, and a failure criterion related to basal slip activity is proposed.

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Section: Introductionmentioning

confidence: 99%

Continuum modeling of the response of a Mg alloy AZ31 rolled sheet during uniaxial deformation

Fernández

Prado

Wei

et al. 2011

International Journal of Plasticity

104

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“…The DRX occurs readily in magnesium and its alloys. According to Ion and his coworkers [12],it can be attributed to the constraint imposed by the lack of easily activated slip systems in hexagonal close packed crystal structure, the low stacking fault energy and also the high grain boundary diffusion rate of magnesium. 5 shows the variation of the elongation at failure with temperature under different strain rates.…”

Section: Analytical Results and Discussionmentioning

confidence: 99%

Flow Stress Characteristics of AZ31B Magnesium Alloy Sheet at Elevated Temperatures

Li¹,

Guo-qun²,

Ma³

et al. 2012

IJAPM

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Abstract-The true stress-strain curves of AZ31B magnesium alloy sheet were obtained by using the uniaxial tensile tests at temperatures ranging from 50℃to 300℃ and initial strain rates ranging from 0.001/s to 0.1/s. The effects of temperature and strain rate on the flow stress were analyzed. The results show that the flow stress decreases and the elongation at fracture increases with increasing temperature and decreasing strain rate, and the formability is improved obviously. Two mathematical models were developed to determine the flow stress at hot deformation condition:(1) the model based on the Fields-Backofen equation, and (2) the model based on a natural exponential form whose exponent is a quadratic function. By comparison of the calculated results with experimental data, it was proved that the flow stresses calculated by the Fields-Backofen model only give a good fit to the measured ones at the work-hardening stage, but it cannot describe the softening behavior after the peak stress. Whereas, the exponential model does not only accurately reflect work hardening before the peak stress,but approaches more closely at the dynamic softening stage of the flow stress than that of the Fields-Backofen model. Index Terms-AZ31B magnesium alloy, uniaxial tensile, dynamic recrystallization (DRX), flow stress, mathematical model.

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“…Early papers 5,6 reported that recrystallization in magnesium alloys deformed in the temperature range of ~423 -673 K occurs by the nucleation of grains along grain boundaries of former grains. This leads to a necklace pattern in the grain structure and multi-modal distribution of grain sizes.…”

Section: Equal Channel Angular Pressing (Ecap)mentioning

confidence: 99%

Grain refinement of commercial purity Magnesium processed by Ecap (Equal Channel Angular Pressing)

et al. 2012

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Grain refinement in magnesium is evaluated in the present paper. Equal Channel Angular Pressing is used to process commercially pure magnesium. Processing was carried out at 523 K which is lower than the temperature used in other papers on the literature. The grain structure was evaluated throughout the deformation zone. The low processing temperature prevents significant grain growth. The evolution of the grain structure is compared to a recent model for mechanism of grain refinement in magnesium. The present results confirm the validity of the model.

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Dynamic recrystallisation and the development of microstructure during the high temperature deformation of magnesium

Cited by 804 publications

References 15 publications

Continuum modeling of the response of a Mg alloy AZ31 rolled sheet during uniaxial deformation

Continuum modeling of the response of a Mg alloy AZ31 rolled sheet during uniaxial deformation

Flow Stress Characteristics of AZ31B Magnesium Alloy Sheet at Elevated Temperatures

Grain refinement of commercial purity Magnesium processed by Ecap (Equal Channel Angular Pressing)

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