Journal ArticleDOI
Dynamic recrystallization during high temperature deformation of magnesium
Talal Al-Samman,G. Gottstein +1 more
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TLDR
In this paper, the influence of deformation conditions on the dynamic recrystallization (DRX) behavior and texture evolution was investigated, and the role of the starting texture in the development of the final DRX grain size was investigated.Abstract:
As a consequence of the high critical stresses required for the activation of non-basal slip systems, dynamic recrystallization plays a vital role in the deformation of magnesium, particularly at a deformation temperature of 200 °C, where a transition from brittle to ductile behavior is observed. Uniaxial compression tests were performed on an extruded commercial magnesium alloy AZ31 at different temperatures and strain rates to examine the influence of deformation conditions on the dynamic recrystallization (DRX) behavior and texture evolution. Furthermore, the role of the starting texture in the development of the final DRX grain size was investigated. The recrystallized grain size, measured at large strains (ɛ ∼ −1.4) seemed to be more dependent on the deformation conditions than on the starting texture. In contrast to pure magnesium, AZ31 does not undergo grain growth at elevated deformation temperatures, i.e. 400 °C, even at a low strain rate of 10−4 s−1. Certain deformation conditions gave rise to a desired fully recrystallized microstructure with an average grain size of ∼18 μm and an almost random crystallographic texture. For samples deformed at 200 °C/10−2 s−1, optical microscopy revealed DRX inside of deformation twins, which was further investigated by EBSD.read more
Citations
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Journal ArticleDOI
Superior light metals by texture engineering: Optimized aluminum and magnesium alloys for automotive applications
Jürgen Hirsch,Talal Al-Samman +1 more
TL;DR: In this article, the basic mechanisms of texture formation of aluminum and magnesium alloys during wrought processing are described and the major aspects and differences in deformation and recrystallization mechanisms are discussed.
Journal ArticleDOI
Mechanical response and texture evolution of AZ31 alloy at large strains for different strain rates and temperatures
TL;DR: In this paper, the texture properties of AZ31 Mg sheet were measured under different loadings along rolling direction (RD), 45° to rolling direction, 90° to roll direction (TD), and normal to the sheet (ND) to large strains.
Journal ArticleDOI
A review on the effect of rare-earth elements on texture evolution during processing of magnesium alloys
TL;DR: In this paper, the authors take a look back at different paradigms held for the action of rare-earth additions, and examine key facts that may reconcile controversies, identifying critical gaps and suggest venues to overcome them.
Journal ArticleDOI
Unveiling the formation of basal texture variations based on twinning and dynamic recrystallization in AZ31 magnesium alloy during extrusion
M.G. Jiang,M.G. Jiang,Cheng-Yan Xu,H. Yan,G. H. Fan,Taiki Nakata,C.S. Lao,C.S. Lao,Rongshi Chen,Shigeharu Kamado,En-Hou Han,B.H. Lu +11 more
TL;DR: In this article, the mechanisms for the formation of basal texture variations were systematically investigated based on the twinning and dynamic recrystallization (DRX) during extrusion using electron back-scatter diffraction (EBSD) characterization.
Journal ArticleDOI
Texture evolution during static recrystallization of cold-rolled magnesium alloys
Zhuoran Zeng,Yuman Zhu,Xu Shiwei,Mingzhe Bian,Chris Huw John Davies,Nick Birbilis,Jian Feng Nie +6 more
TL;DR: In this paper, a quasi-in-situ electron backscatter diffraction (EBSD) method was used to study the texture evolution in cold-rolled Mg-0.3Zn- 0.1Ca alloys during static recrystallization.
References
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Journal ArticleDOI
Correlation of plastic deformation and dynamic recrystallization in magnesium alloy ZK60
TL;DR: In this paper, the mechanisms of deformation and dynamic recrystallization in a Mg-5.8% Zn-0.65% Zr alloy were studied by compression tests at temperatures between 423 and 723 K and at strain rates ranging from 10−5 to 10−1 s−1.
Journal ArticleDOI
A one-parameter approach to determining the critical conditions for the initiation of dynamic recrystallization
E.I. Poliak,John J. Jonas +1 more
TL;DR: In this article, the onset of dynamic recrystallization is treated in terms of a model based on the principles of irreversible thermodynamics, and the model is verified using experimental data obtained during the high temperature compression of nickel and of a type 305 austenitic stainless steel.
Journal ArticleDOI
Dynamic recrystallisation and the development of microstructure during the high temperature deformation of magnesium
TL;DR: The mechanism of dynamic recrystallisation at temperatures between 425 and 600 K is reported to not involve significant high angle boundary migration, but to be similar to a mechanism reported for several minerals.
Journal ArticleDOI
Dynamic recrystallization in nickel and nickel-iron alloys during high temperature deformation
M.J Luton,C.M. Sellars +1 more
TL;DR: In this paper, it is established from metallographic and flow stress observations that dynamic recrystallization occurs at strains greater than a critical value and results in a recrystized grain size which is determined entirely by the flow stress.
Journal ArticleDOI
Microstructures and textures of pure magnesium deformed in plane-strain compression
Mark Nave,Matthew Barnett +1 more
TL;DR: In this article, textured polycrystalline Mg samples compressed parallel and perpendicular to the predominant c-axis direction in a channel die were characterized using EBSD and anomalous peaks in the misorientation angle distribution of the latter sample result from twinning on two different planes within individual grains.
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