Tensile characterization and constitutive modeling of AZ31B magnesium alloy sheet over wide range of strain rates and temperatures

Ulacia, I.; Salisbury, Christopher; Hurtado, I.; Worswick, Michael J.

doi:10.1016/j.jmatprotec.2010.09.010

Cited by 182 publications

(77 citation statements)

References 21 publications

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“…However, most of these high strain rate studies have concentrated on extruded magnesium alloys which usually have a different initial crystallographic texture compared with rolled sheets. Recently, the constitutive behaviour of commercial AZ31B rolled sheet at high strain rates was examined by Ulacia et al [16], who observed that the flow stress and also elongation increase considerably at high strain rates when compared with quasi-static rates, resulting in an increase in energy absorption.…”

Section: Introductionmentioning

confidence: 99%

Rate sensitivity and tension–compression asymmetry in AZ31B magnesium alloy sheet

Kurukuri

Worswick

Tari

et al. 2014

Phil. Trans. R. Soc. A.

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The constitutive response of a commercial magnesium alloy rolled sheet (AZ31B-O) is studied based on room temperature tensile and compressive tests at strain rates ranging from 10 −3 to 10 3 s −1 . Because of its strong basal texture, this alloy exhibits a significant tension–compression asymmetry (strength differential) that is manifest further in terms of rather different strain rate sensitivity under tensile versus compressive loading. Under tensile loading, this alloy exhibits conventional positive strain rate sensitivity. Under compressive loading, the flow stress is initially rate insensitive until twinning is exhausted after which slip processes are activated, and conventional rate sensitivity is recovered. The material exhibits rather mild in-plane anisotropy in terms of strength, but strong transverse anisotropy ( r -value), and a high degree of variation in the measured r -values along the different sheet orientations which is indicative of a higher degree of anisotropy than that observed based solely upon the variation in stresses. This rather complex behaviour is attributed to the strong basal texture, and the different deformation mechanisms being activated as the orientation and sign of applied loading are varied. A new constitutive equation is proposed to model the measured compressive behaviour that captures the rate sensitivity of the sigmoidal stress–strain response. The measured tensile stress–strain response is fit to the Zerilli–Armstrong hcp material model.

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Section: Introductionmentioning

confidence: 99%

Rate sensitivity and tension–compression asymmetry in AZ31B magnesium alloy sheet

Kurukuri

Worswick

Tari

et al. 2014

Phil. Trans. R. Soc. A.

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“…The one corresponding to the compression test along the RD (Fig. la) exhibits first a "concave-up" stage, indicative of the presence of twinning, which is known to occur at high temperatures under dynamic conditions [5,[30][31][32][33]. This is followed by significant strain hardening up to a strain of approximately 0.08 and, subsequently, a stage of practically zero hardening until fracture at a strain of 0.28.…”

Section: Resultsmentioning

confidence: 95%

“…Depending on the material composition and microstructural characteristics, DDRX and CDRX may coexist in wide Z ranges. The high temperature deformation and recrystallization mechanisms of Mg alloys at impact strain rates (~10 3 s _1 ) are currently not well understood, as significantly fewer studies have been carried out in this area [5,[30][31][32][33][34][35][36]. It is known that the CRSS of nonbasal systems decreases more slowly with temperature than under quasi-static conditions [5] and, thus, twinning is operative even at T>400°C [5,[30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Influence of texture on the recrystallization mechanisms in an AZ31 Mg sheet alloy at dynamic rates

Dudamell

Ulacia

Gálvez

et al. 2011

Materials Science and Engineering: A

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An AZ31 rolled sheet alloy has been tested at dynamic strain rates (e~10 3 s _1 ) at 250°C up to various intermediate strains before failure in order to investigate the predominant deformation and restoration mechanisms. In particular, tests have been carried out in compression along the rolling direction (RD), in tension along the RD and in compression along the normal direction (ND). It has been found that dynamic recrystallization (DRX) takes place despite the limited diffusion taking place under the high strain rates investigated. The DRX mechanisms and kinetics depend on the operative deformation mechanisms and thus vary for different loading modes (tension, compression) as well as for different relative orientations between the loading axis and the c-axes of the grains. In particular, DRX is enhanced by the operation of (c + a) slip, since cross-slip and climb take place more readily than for other slip systems, and thus the formation of high angle boundaries is easier. DRX is also clearly promoted by twinning.

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“…Recent contributions in this field address the failure pattern of extruded magnesium rods [2], the strain rate sensitivity in compression [3,4], the behaviour of cast alloys [5] and FE-modelling of the response during crushing [6]. Most of the investigations mentioned were conducted at room In a cooperation between the Light-weight Materials Assessment, Computing and Engineering Centre (ACE) and the Magnesium Innovation Centre (MagIC), both at Helmholtz-Zentrum Geesthacht, an attempt was made to study the crashworthiness of prismatic profiles produced from magnesium alloys AZ31 and ZE10 under quasistatic macroscopic compressive loading.…”

Section: Introductionmentioning

confidence: 99%

Crashworthiness of Magnesium Sheet Structures

Steglich

Bohlen

Tian

et al. 2013

MSF

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A hollow rectangular profile, as an example of a typical structural component made of magnesium alloy sheets has been built, tested and evaluated in order to assess its behaviour during axial crushing. The profiles were joined from plane sheets of AZ31 and ZE10, respectively, by laser beam welding and were then tested in compression. Numerical simulations have been conducted to understand the complex interplay between hardening characteristics of the materials under investigation, profile cross-section variation and energy absorption. The results from the compression testing of the profiles show that the welds are not the source of damage initiation and failure. The performance of the magnesium profiles in terms of dissipated specific energy is confirmed for small and intermediate displacements to be comparable to that of aluminium profiles. For large displacements, however, the shear-type failure mode of magnesium causes a sharp drop of the crushing force and thus limits the energy absorption. These findings demonstrate the requirement for an alloy and wrought magnesium process development specifically for crash applications which aims at progressive hardening along with high ductility for improving the bending and shear behaviour.

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Tensile characterization and constitutive modeling of AZ31B magnesium alloy sheet over wide range of strain rates and temperatures

Cited by 182 publications

References 21 publications

Rate sensitivity and tension–compression asymmetry in AZ31B magnesium alloy sheet

Rate sensitivity and tension–compression asymmetry in AZ31B magnesium alloy sheet

Influence of texture on the recrystallization mechanisms in an AZ31 Mg sheet alloy at dynamic rates

Crashworthiness of Magnesium Sheet Structures

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