Yielding of magnesium: From single crystal to polycrystalline aggregates

Graff, Stéphane; Brocks, W.; Steglich, D.

doi:10.1016/j.ijplas.2007.07.009

Cited by 258 publications

(156 citation statements)

References 31 publications

Supporting

Mentioning

131

Contrasting

Order By: Relevance

“…If fcc and bcc crystal plasticity continuum models have already been extensively studied (Cuitiño and Ortiz, 1993;Anand and Kothari, 1996;Anand, 2004;Houtte et al, 2006;Zhao et al, 2007;Kuchnicki et al, 2008;Jérusalem et al, 2008;Roters et al, 2010;Lee et al, 2010;Liu et al, 2011;Thamburaja, 2010;Rossiter et al, 2010;Zamiri and Pourboghrat, 2010;Watanabe et al, 2010;Sung et al, 2010), similar efforts have been much scarcer for HCP metals (Staroselsky, 1998;Staroselsky and Anand, 2003;Graff et al, 2007;Mayeur and McDowell, 2007;Tang et al, 2009;Mayama et al, 2009;Prakash et al, 2009;Choi et al, 2010b;Choi et al, 2010a;Lévesque et al, 2010). Despite the relatively ancient interests in HCP metals, the intrinsic mechanisms of HCP crystalline deformation, such as twinning (generally more present than in fcc and bcc metals), twin-slip interaction, or twin polarization among others, are still, as of now, not fully understood (Jérusalem et al, 2008;Wang et al, 2009a;Yue et al, 2010;Shen et al, 2010).…”

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

101

View full text Add to dashboard Cite

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.

show abstract

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

101

View full text Add to dashboard Cite

show abstract

“…However, after annealing AZ61 for 1 hour, the samples are free of twins, and most of the grains are oriented in such a way that the <1120> direction is parallel and <1010> is perpendicular to the RD. This kind of texture favors the activation of soft slip systems during the plastic deformation of magnesium and its alloys [13].…”

Section: Fig 3 Average Grain Size and Vickers Hardness In Relation mentioning

confidence: 96%

“…In the magnesium alloy with the basal fiber texture (the case of AZ61 after hot rolling in the present study), the grains are oriented in a way that the c-axis is perpendicular to the rolling direction and parallel to the normal direction (ND); see Figure 1. This orientation hampers the activation of the basal slip systems during such processes as rolling or tension and may lead to the failure of AZ61 during rolling [4,11,13]. However, after annealing AZ61 for 1 hour, the samples are free of twins, and most of the grains are oriented in such a way that the <1120> direction is parallel and <1010> is perpendicular to the RD.…”

Section: Fig 3 Average Grain Size and Vickers Hardness In Relation mentioning

confidence: 99%

Structure and Properties of Hot-Rolled and Annealed Az61 Magnesium Alloy

Sułkowski

2017

mafe

View full text Add to dashboard Cite

Structure and properties of hot-rolled and annealed AZ61 magnesium alloy Struktura i własności stopu AZ61 po walcowaniu na gorąco i wyżarzaniu AbstractMagnesium alloy AZ61 was processed by hot rolling up to a large thickness reduction (~89%) in several routes with intermediate annealing. The hot rolling process was conducted at 450°C and at a 1.5 s −1 strain rate. The structure and texture evolution as well as the mechanical properties during processing were investigated. The structure studies showed that, during the hot-rolling process, a large number of twins formed, which had an impact on the mechanical properties of the hot-rolled samples. After annealing for 15 minutes, the twins were no longer observed in the annealed samples, causing a significant decrease in hardness. Moreover, an investigation of the hardness showed that annealing for 15 minutes did not remove all of the hardening effects nor did the hardness of the annealed samples decrease to the value before hot rolling. The texture investigations showed that the texture of the hot-rolled samples was a typical basal-type texture. However, the basal pick was split into two tilted towards the rolling direction (RD). The texture changed during annealing while the new strong texture components evolved. The annealing led to an increased intensity of <1010>{1120} texture component and enhanced ductility. It was concluded that the texture changes observed in the present investigations may lead to the enhanced ductility of magnesium alloys and, therefore, help us design a deformation scheme for magnesium alloys consisting of several thermomechanical routes. Keywords: magnesium alloys, texture, hot rolling, annealing StreszczenieStop magnezu AZ61 został odkształcony przez walcowanie na gorąco do sumarycznego zgniotu 89%, w kilku przepustach z wyżarzaniem międzyoperacyjnym. Walcowanie odbywało się w temperaturze 450°C, a prędkość odkształcenia wynosiła 1,5 s −1 . W pracy badano wpływ struktury oraz tekstury na własności mechaniczne stopu AZ61. Badania strukturalne pokazały występowanie

show abstract

“…However, predicting the macroscopic mechanical response of bulk polycrystalline magnesium while also resolving the local fields, particularly interactions of twins with grain boundaries, presents an open challenge. The hexagonal closed-packed (hcp) crystal structure of Mg results in anisotropic inelastic deformation mechanisms (Graff et al, 2007;Stanford et al, 2011), remarkably low ductility and an asymmetric tension-compression behavior (Máthis et al, 2011;Park et al, 2014;Zachariah et al, 2013;Kurukuri et al, 2014). Dislocation slip and deformation twinning occur as competing mechanisms, and their mechanistic influences drive complex microstructure evolution paths observed in magnesium polycrystals (Agnew and Duygulu, 2005;Chang et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Deformation patterning in finite-strain crystal plasticity by spectral homogenization with application to magnesium

Vidyasagar

Tutcuoglu

Kochmann

2018

Computer Methods in Applied Mechanics and Engineering

View full text Add to dashboard Cite

Complex microstructural patterns arise as energy-minimizers in systems having non-convex energy landscapes such as those associated with phase transformations, deformation twinning, or finite-strain crystal plasticity. The prediction of such patterns at the microscale along with the resulting, effective material response at the macroscale is key to understanding a wide range of mechanical phenomena and has classically been dealt with by simplifying energy relaxation theory or by expensive finite element calculations. Here, we discuss a stabilized Fourier spectral technique for the homogenized response at the level of a representative volume element (RVE). We show that the FFT-based method admits sufficiently high resolution suitable to predict the emergence of energy-minimizing microstructures and the resulting effective response by computing the approximated quasiconvex energy hull. We test the method in the classical single-slip problem in single-and bicrystals. Especially the latter goes beyond the scope of traditional finite element and analytical relaxation treatments and hints at mechanisms of pattern formation in polycrystals. We also demonstrate that the chosen spectral finite-difference approximation, important for removing ringing artifacts in the presence of high contrasts, adds a natural regularization to the non-convex minimization. Finally, the technique is applied to polycrystalline pure magnesium, where we account for the competition between dislocation-mediated plasticity and deformation twinning. These inelastic deformation mechanisms result in complex texture evolution paths at the polycrystalline mesoscale and are simulated within RVEs of varying grain size and texture by a constitutive crystal plasticity model with an effective, volume fraction-based description of twinning.

show abstract

Yielding of magnesium: From single crystal to polycrystalline aggregates

Cited by 258 publications

References 31 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

Structure and Properties of Hot-Rolled and Annealed Az61 Magnesium Alloy

Deformation patterning in finite-strain crystal plasticity by spectral homogenization with application to magnesium

Contact Info

Product

Resources

About