Study of slip mechanisms in a magnesium alloy by neutron diffraction and modeling

Agnew, Sean R.; Tomé, Carlos N.; Brown, Donald W.; Holden, T. M.; Vogel, Sven C.

doi:10.1016/s1359-6462(02)00591-2

Cited by 558 publications

(205 citation statements)

References 11 publications

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“…It has nevertheless been recently reported that, despite the low volume fraction of such twins, their effect in the hardening of the AZ31 alloy might be important . On the other hand, it is also widely accepted that pyramidal slip accommodates most of the compression strain along the c-axis (Agnew et al, 2003;Knezevic et al, 2010).…”

Section: Finite Element Discretizationmentioning

confidence: 99%

“…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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Section: Finite Element Discretizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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show abstract

“…Mesoscale models such as the mean-field elasto-plastic self-consistent model, 14,15 the meanfield elasto-viscoplastic self-consistent model, 16 the full-field crystal plasticity finite element (FE) model, 17 the full-field elasto-viscoplastic fast Fourier transform (EVP-FFT) model, 18 etc., have been used to understand the lattice strain evolution during uniaxial loading for different material systems. In this work, the computationally efficient full-field EVP-FFT model is used.…”

Section: Introductionmentioning

confidence: 99%

Intergranular Strain Evolution During Biaxial Loading: A Multiscale FE-FFT Approach

Upadhyay

Čapek

Petegem

et al. 2017

JOM

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“…After extrusion, if the tensile axis lies within the basal plane of the majority of grains, the grains are forced to deform by either non-basal cross-glide of basal dislocations or pyramidal slip of large Burgers vector ‹c+a› dislocations. 11 These hard deformation modes possess a high critical resolved flow stress, and ultimately result in the premature failure of properly oriented samples. In contrast, if the basal axes are oriented close to the tensile stress axis, there is very strong signature of the {1012} tensile twinning [1113].…”

Section: Introductionmentioning

confidence: 99%

The effect of thermo-mechanical processing on the structure, static mechanical properties and fatigue behaviour of pure Mg

Kubásek¹,

Vojtěch²,

Dvorský³

2017

Mater. tehnol.

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Magnesium alloys find important applications in automotive, aircraft and space industries. Magnesium itself is also a key component in biodegradable metallic materials considered for applications in medicine. Although there are many studies that include the mechanical behaviour of pure Mg and its alloys after different thermomechanical processing, there is a huge impact of the processing method on the observed properties. Based on these facts, predicting the final properties is difficult. This paper deals with the preparation of pure Mg using a classic extrusion method with a low extrusion ratio, slow extrusion rate and low temperature. These parameters were selected to prevent an excessive grain size and to obtain optimal mechanical properties. The prepared materials were subsequently heat treated under different conditions and the relations between the grain size, texture strength and mechanical properties were studied. As well as static mechanical tests in tension and compression, fatigue tests were also performed. Finally, the obtained data were fitted using the Hall-Petch relation and the results were compared with the literature. The observed results confirmed the significant effect of processing on the mechanical properties with a strong impact on the Hall-Petch behaviour. Keywords: magnesium, mechanical properties, texture, Hall-Petch relation Magnezijeve zlitine so pomembne za uporabo v avtomobilski, letalski in vesoljski industriji. Magnezij je tudi klju~na komponenta v biorazgradljivih kovinskih materialih za uporabo v medicini.^eprav obstaja mnogo {tudij, ki vklju~ujejo mehansko obna{anje~istega Mg in njegovih zlitin po razli~nih termomehanskih obdelavah, je velik vpliv metode obdelovanja na opazovane lastnosti. Na osnovi tega je te`ko napovedovati kon~ne lastnosti. Ta~lanek obravnava pripravo~istega Mg s klasi~no metodo ekstruzije z majhnim razmerjem ekstruzije, majhno hitrostjo ekstruzije pri nizki temperaturi. Ti parametri so bili izbrani, da se prepre~i prekomerna rast zrn in da se dose`e optimalne mehanske lastnosti. Pripravljeni material je bil pozneje toplotno obdelan pri razli~nih pogojih in {tudirane so bile odvisnosti med velikostjo zrn, teksturo in mehanskimi lastnostmi. Razen stati~nih mehanskih preizkusov, nateznih in tla~nih, so bili izvedeni tudi preizkusi utrujanja. Na koncu so bili dobljeni podatki primerjani s Hall-Petchevim razmerjem in dobljeni rezultati so bili primerjani s podatki iz literature. Dobljeni rezultati so potrdili mo~an vpliv obdelave na mehanske lastnosti, z mo~nim vplivom na Hall-Petchevo razmerje.

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Study of slip mechanisms in a magnesium alloy by neutron diffraction and modeling

Cited by 558 publications

References 11 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

Intergranular Strain Evolution During Biaxial Loading: A Multiscale FE-FFT Approach

The effect of thermo-mechanical processing on the structure, static mechanical properties and fatigue behaviour of pure Mg

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