Tensile-compressive yield asymmetries in high strength wrought magnesium alloys

Ball, E.A.; Prangnell, P.B.

doi:10.1016/0956-716x(94)90159-7

Cited by 492 publications

(210 citation statements)

References 5 publications

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“…However, as mentioned above, the detailed mechanism on the weakening or changing of basal texture is not clearly clarified, i.e. the more randomized texture associated with PSN of recrystallization 21,22) or the lower overall texture strength attributed to the solute content change in the solid solution matrix.…”

Section: Discussionmentioning

confidence: 99%

“…However, the detailed mechanism on the weakening or changing of basal texture is not clearly clarified, even though a few models are proposed to explain the phenomenon: (1) the more randomized texture in Y and RE containing Mg alloy is associated with particle stimulated nucleation (PSN) of recrystallization; 21,22) and (2) the lower overall texture strength in wrought MgZnRE alloys is attributed to the solute content in the solid solution matrix, for example, Zn content in the ¡-Mg matrix. 19) It has been shown further that more random texture is possible even in solid solution type binary Mg alloy containing lower content of Y, indicating that formation of the texture is affected by the nature of ¡-Mg solid solution matrix.…”

Section: )mentioning

confidence: 99%

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Texture Modification by Addition of Ca in Mg–Zn–Y Alloy

et al. 2012

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The secondary solidification phase of icosahedral (I-) phase in rolled MgZnY alloy is replaced with I + Ca 2 Mg 6 Zn 3 phases by addition of Ca. Addition of Ca in MgZnY alloy significantly accelerates dynamic and static recrystallization resulting in much fine grain size and more random texture. EBSD analysis indicates that the presence of Ca in the ¡-Mg solid solution matrix may play a role in weakening of basal texture rather than particle stimulation nucleation effect by the second solidification phases.

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Section: Discussionmentioning

confidence: 99%

Section: )mentioning

confidence: 99%

Texture Modification by Addition of Ca in Mg–Zn–Y Alloy

et al. 2012

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“…The much weaker texture exhibited in WE alloy when extruded compared to a conventional (non-RE) alloy and its correlation with the greatly reduced mechanical asymmetry was first explicitly noted by Ball and Prangnell. [12] The mechanism for texture weakening was not studied, but was speculated to be due to particle stimulated nucleation of recrystallization. However, since many conventional (non-RE) magnesium alloys also contain stable coarse particles but retain a strong basal texture, this mechanism alone would not explain their observations.…”

Section: Understanding the Rare-earth Effect: Backgroundmentioning

confidence: 99%

Effect of Rare-Earth Additions on the Texture of Wrought Magnesium Alloys: The Role of Grain Boundary Segregation

Robson

2013

Metall Mater Trans A

188

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Magnesium alloys that contain certain rare-earth (RE) additions are known to have improved formability and this can be partly attributed to the different texture they display after recrystallization. Previous experimental work has identified segregation of RE to grain boundaries and dislocations as being potentially important in producing this change in behavior. In the present paper, two classical models (Langmuir-McClean and Cahn-Lu¨cke-Stu¨we) are used to explore the likely effect of RE additions on grain boundary solute concentration and drag. It is demonstrated that a wide range of RE elements are predicted to segregate strongly to grain boundaries due to the large atomic size misfit with magnesium. The maximum level of segregation is produced for elements such as Y or Gd that combine a high misfit and high bulk solubility. Segregated Y is predicted to produce a solute drag pressure on migrating boundaries several orders of magnitude greater than that obtained by Al or Zn additions. It is demonstrated that while this drag is predicted to be insufficient to strongly retard static recrystallization under typical annealing conditions, it is expected to suppress dynamic recrystallization by any mechanism requiring boundary migration.

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“…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%

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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Tensile-compressive yield asymmetries in high strength wrought magnesium alloys

Cited by 492 publications

References 5 publications

Texture Modification by Addition of Ca in Mg–Zn–Y Alloy

Texture Modification by Addition of Ca in Mg–Zn–Y Alloy

Effect of Rare-Earth Additions on the Texture of Wrought Magnesium Alloys: The Role of Grain Boundary Segregation

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

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Tensile-compressive yield asymmetries in high strength wrought magnesium alloys

Cited by 492 publications

References 5 publications

Texture Modification by Addition of Ca in Mg&ndash;Zn&ndash;Y Alloy

Texture Modification by Addition of Ca in Mg&ndash;Zn&ndash;Y Alloy

Effect of Rare-Earth Additions on the Texture of Wrought Magnesium Alloys: The Role of Grain Boundary Segregation

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

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Texture Modification by Addition of Ca in Mg–Zn–Y Alloy

Texture Modification by Addition of Ca in Mg–Zn–Y Alloy