Hardening evolution of AZ31B Mg sheet

Lou, Xiaoyuan; Li, M.; Boger, R.K.; Agnew, Sean R.; Wagoner, R. H.

doi:10.1016/j.ijplas.2006.03.005

Cited by 927 publications

(486 citation statements)

References 64 publications

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“…From figure 4a-c, it is observed that the shape of the stress-strain curves is concave upwards (S-shape) for the inplane compressive loading at all strain rates. Such a stress-strain response is consistent with the predominance of [10][11][12] twinning that takes place during the first stages of deformation, leading to an 86 • rotation of the c-axes (which are perpendicular to compression axis in most grains before deformation) which brings them into alignment with the compression axis. This initial twinning is followed by strong strain-hardening behaviour at larger strains owing to the subsequent operation of non-basal slip [4,7,8].…”

Section: Resultssupporting

confidence: 74%

“…Extensive research has been carried out on the plastic deformation behaviour of magnesium alloys, but most studies have focused on quasi-static loading conditions [12][13][14]. The high strain rate behaviour is of great interest to the automotive and aircraft sectors, because the dynamic response of components must be known to support design and simulation for severe loading conditions, such as crash or impact [15,16].…”

Section: Introductionmentioning

confidence: 99%

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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: Resultssupporting

confidence: 74%

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 operation of hc + ai slip during the last stages of deformation has been reported under such conditions by Yi et al (2006). Here too, some other investigations report that strain is, instead, accommodated by the activation of other mechanisms, such as a combination of basal and hai pyramidal slip (Mordike and Ebert, 2001), the increasing activity of basal slip (Lou et al, 2007) or the simultaneous operation of basal slip and double twinning (Kelley and Hosford, 1968b).…”

Section: Introductionmentioning

confidence: 86%

“…In particular, at this point it is key to develop simulation models that, supported by the experimental data available, can predict of the response of Mg alloys under different service conditions. The deformation mechanisms of Mg and Mg alloys that are operative at low strain rates have been extensively investigated over the past years (Couling et al, 1959;Kocks and Westlake, 1967;Kelley and Hosford, 1968a;Couret and Caillard, 1985;Chin and Mammel, 1970;Yoo, 1981;Vagaralia and Langdon, 1981;Zelin et al, 1992;Munroe and Tan, 1997;Agnew et al, 2001;Watanabe et al, 2001;Barnett, 2001;Agnew et al, 2003;Galiyev et al, 2003;Koike et al, 2003;Barnett, 2003;Gehrmann et al, 2005;Barnett et al, 2004a;Agnew and Duygulu, 2005;del Valle et al, 2005;Keshavarz and Barnett, 2006;Meza-García et al, 2007;Barnett, 2007;del Valle and Ruano, 2007;Al-Samman and Gottstein, 2008;Chino et al, 2008;Jain et al, 2008;Hutchinson et al, 2009;Ball and Prangnell, 1994;Lou et al, 2007). Slip in hexagonal close packed (HCP) metals may take place along the h11 20i (hai) direction on basal and non-basal (f10 10g-prismatic, f10 11g-pyramidal) planes.…”

Section: Introductionmentioning

confidence: 99%

“…Although widely spread values have been reported for the critical resolved shear stress (CRSS) in different slip and twinning systems (Chin and Mammel, 1970;Agnew et al, 2001Agnew et al, , 2003Barnett, 2003;Agnew and Duygulu, 2005;Lou et al, 2007), it is generally accepted that, for polycrystals, CRSS basal < CRSS twinning < CRSS prismatic 6 CRSS pyramidal . In agreement with this trend, earlier studies reported that slip on basal planes and f10 12g twinning (so called extension twinning) are the main deformation mechanisms during uniaxial deformation at low temperatures and low strain rates in randomly oriented Mg polycrystals of conventional grain sizes ($10 À 50 lm) (Couling et al, 1959;Kocks and Westlake, 1967;Kelley and Hosford, 1968a;Couret and Caillard, 1985;Chin and Mammel, 1970;Yoo, 1981).…”

Section: Introductionmentioning

confidence: 99%

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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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Modeling Plastic Anistropy and Strength Differential Effects in Metallic Materials

Cazacu¹,

Barlat²

2008

Multiscale Modeling of Heterogenous Materials

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Hardening evolution of AZ31B Mg sheet

Cited by 927 publications

References 64 publications

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

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

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

Modeling Plastic Anistropy and Strength Differential Effects in Metallic Materials

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