Characterization of yielding behavior of polycrystalline metals with single crystal plasticity based on representative characteristic length

Watanabe, Ikumu; Setoyama, Daigo; Iwata, Noritoshi; Nakanishi, Koukichi

doi:10.1016/j.ijplas.2009.09.005

Cited by 29 publications

(18 citation statements)

References 38 publications

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“…The detailed methodologies of the modeling procedure are provided elsewhere. [21][22][23][24] The averaged macroscopic properties of heterogeneous harmonic microstructure were obtained using the concept of a representative volume element (RVE). An RVE is de ned as a part extracted from the complete microstructure and it acts as a representative of the complete microstructure.…”

Section: Methodsmentioning

confidence: 99%

Three-Dimensionally Gradient and Periodic Harmonic Structure for High Performance Advanced Structural Materials

Vajpai

Ota

et al. 2016

Mater. Trans.

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Creation of a unique Harmonic Structure (HS) with controlled bimodal grain size distribution in metals and alloys is a new material design paradigm allowing the improved mechanical performance of structural materials via enhancing strength without sacri cing ductility. A well designed powder metallurgy based processing approach has been developed to create such a controlled microstructure which consists of controlled mechanical milling (MM) of powder particles to create powder particles with bimodal grain size distribution, with a peculiar coreshell structure, followed by their hot consolidation. In the present study, full density compacts with HS were prepared and the effect of such a bimodal microstructure on the mechanical properties of commercially pure Ti with hexagonal close packed (HCP) crystal structure was investigated. The HS pure Ti exhibited considerably higher strength values, without sacri cing ductility, as compared to their coarse-grained (CG) counterparts. The numerical simulation results revealed that the initial stages of deformation and strength of the HS are governed by the characteristics of the interconnected network of the strong ne-grained (FG) shell regions whereas the extent of uniform deformation and overall ductility is governed by the ductile CG core region. It was also demonstrated that the unique HS design promotes uniform deformation very ef ciently by avoiding strain localization during plastic deformation.

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Section: Methodsmentioning

confidence: 99%

Three-Dimensionally Gradient and Periodic Harmonic Structure for High Performance Advanced Structural Materials

Vajpai

Ota

et al. 2016

Mater. Trans.

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“…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

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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“…Obviously, it would be more difcult to validate the numerical simulations by using advanced constitutive models 11,12) . A method to validate simulations and models should be established in this eld.…”

Section: Discussionmentioning

confidence: 99%

“…FE analysis using a constitutive model of a single crystal, which is commonly known as the crystal plasticity nite element method (CPFEM), has drawn a great deal of attention as a cross-disciplinary research eld between mechanics and metallurgy 9,10) . Advanced crystal plasticity models have been developed to describe the strengthening effect of ne-graining on the basis of dislocation theory 11,12) . In addition, polycrystal plasticity models have been coupled with homogenization theories and the constitutive model of a single crystal to estimate the evolution of a crystallographic texture corresponding to a metal-forming process.…”

Section: Introductionmentioning

confidence: 99%

Multiscale Characterization of a Polycrystalline Aggregate Subjected to Severe Plastic Deformation with the Finite Element Method

Watanabe¹,

Setoyama

2016

Mater. Trans.

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The heterogeneous deformation of a polycrystalline aggregate under severe plastic deformation was reproduced with nite element analysis by using single-crystal plasticity to characterize the evolution process of the heterogeneity. Finite element analyses of a periodic polycrystalline aggregate were carried out to simulate the deformation process corresponding to the multi-pass equal-channel angular extrusion process, which reached over 250% of the macroscopic logarithmic accumulated plastic strain. The numerical results were analyzed from multi-scale perspectives: the macroscopic response, evolution of the crystallographic orientation, and deformation state of the microstructure. This study addressed the importance of nite element discretization to reproduce the heterogeneous deformation of a polycrystalline aggregate, including that of the inside grains, which is a key element for investigating the underlying ne-graining mechanism.

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Characterization of yielding behavior of polycrystalline metals with single crystal plasticity based on representative characteristic length

Cited by 29 publications

References 38 publications

Three-Dimensionally Gradient and Periodic Harmonic Structure for High Performance Advanced Structural Materials

Three-Dimensionally Gradient and Periodic Harmonic Structure for High Performance Advanced Structural Materials

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

Multiscale Characterization of a Polycrystalline Aggregate Subjected to Severe Plastic Deformation with the Finite Element Method

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