Influence of grain size fluctuations on ductility of superplastic magnesium alloys processed by severe plastic deformation

Valle, Jorge F. del; Ruano, Oscar Antonio

doi:10.1179/174328407x213215

Cited by 8 publications

(7 citation statements)

References 40 publications

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“…In order to achieve the better mechanical properties of the superplastic alloy, the alloys should possess fine grain size and it should remain stable during deformation [50]. A fine-grained microstructure has a greater number of grains and grain boundaries than that of a coarse grain counterpart and is typically less than 10 µm.…”

Section: Effect Of Initial Grain Size On the Superplasticity Of Al Almentioning

confidence: 99%

Recent Development of Superplasticity in Aluminum Alloys: A Review

Bhatta

Pesin

Zhilyaev

et al. 2020

Metals

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Aluminum alloys can be used in the fabrication of intricate geometry and curved parts for a wide range of uses in aerospace and automotive sectors, where high stiffness and low weight are necessitated. This paper outlines a review of various research investigations on the superplastic behavior of aluminum alloys that have taken place mainly over the past two decades. The influencing factors on aluminum alloys superplasticity, such as initial grain size, deformation temperature, strain rate, microstructure refinement techniques, and addition of trace elements in aluminum alloys, are analyzed here. Since grain boundary sliding is one of the dominant features of aluminum alloys superplasticity, its deformation mechanism and the corresponding value of activation energy are included as a part of discussion. Dislocation motion, diffusion in grains, and near-grain boundary regions being major features of superplasticity, are discussed as important issues. Moreover, the paper also discusses the corresponding values of grain size exponent, stress exponent, solute drag creep and power law creep. Constitutive equations, which are essential for commercial applications and play a vital role in predicting and analyzing the superplastic behavior, are also reviewed here.

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Section: Effect Of Initial Grain Size On the Superplasticity Of Al Almentioning

confidence: 99%

Recent Development of Superplasticity in Aluminum Alloys: A Review

Bhatta

Pesin

Zhilyaev

et al. 2020

Metals

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“…Microstructural evolution during ECAP of magnesium and its alloys has been a subject of numerous investigations …”

Section: Microstructure Evolution During Spd Of Magnesium Alloysmentioning

confidence: 99%

“…Under these conditions, the significance of DRX for microstructure formation during hot deformation processing of Mg alloys cannot be overvalued. The DRX mechanisms in magnesium and its alloys have been extensively studied and understood in great details . For additional information, the reader is directed to a recent comprehensive review by Kaibyshev .…”

Section: Microstructure Evolution During Spd Of Magnesium Alloysmentioning

confidence: 99%

Tailoring Microstructure and Properties of Fine Grained Magnesium Alloys by Severe Plastic Deformation

2017

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Modern wrought magnesium alloys have poor formability at room temperature, which impedes the wider uptake of these alloys by the industry. Over the last decades, research activities in the area of magnesium alloy development have grown enormously and have produced a pallet of exciting findings, which the authors summarize in this concise review focused on the effect of the microstructure, primarily of grain size, on room temperature ductility of wrought Mg-based alloys. Well-established paths and modern strategies to control over the grain size distribution are discussed. It is demonstrated that the use of severe plastic deformation techniques for ultimate grain refinement in magnesium alloys opens new windows for improving their mechanical properties profile by managing both strength and ductility in a wide range. However, it is shown that grain size alone cannot be regarded as a key parameter controlling the mechanical behavior of Mg alloys. The effect of texture is of paramount importance for the overall mechanical response of Mg alloys and this may supersede the influence of grain size.

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“…An iso-strain model, considering that each grain deforms at the imposed macroscopic strain rate, allows the ma- jor experimental observations to be readily explained and predicted. The influence of large-scale heterogeneities in the grain size on ductility was also analysed in the superplastic regime [111]. It was demonstrated that these fluctuations could lead to premature necking.…”

Section: High Temperature Deformationmentioning

confidence: 99%

“…In addition, the thermal stability of the microstructures obtained by severe plastic deformation processes has been discussed with the aim of obtaining the optimum superplastic conditions [67,109]. Finally, the effect of microstructural heterogeneities on the superplastic capability of the magnesium alloys has been analysed and modelled [110,111]. Determination of steady-state stress data at high temperature for a given set of strain rates under the condition of constant microstructure is difficult, as significant microstructural changes (grain growth, texture changes) take place during testing.…”

Section: High Temperature Deformationmentioning

confidence: 99%

Influence of thermomechanical processing on the grain size, texture and mechanical properties of Mg-Al alloys

Srinivasarao¹,

Valle²,

Ruano³

et al. 2012

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The work carried out by the authors over the last decade on the processing, microstructural characterization and the mechanical behaviour of Mg alloys is reviewed. In particular, the potential for grain refinement and for the development of specific textures of large strain hot rolling (LSHR), equal channel angular pressing (ECAP) and accumulative roll bonding (ARB) is discussed. The recrystallization and the deformation mechanisms predominant in Mg alloys are analysed as a function of the grain size and the texture in a wide range of stresses, strain rates and temperatures. Finally, the feasibility of superplastic forming of Mg alloys was examined, taking into account the influence of factors such as grain size stability and microstructural heterogeneities.K e y w o r d s : magnesium alloys,

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Influence of grain size fluctuations on ductility of superplastic magnesium alloys processed by severe plastic deformation

Cited by 8 publications

References 40 publications

Recent Development of Superplasticity in Aluminum Alloys: A Review

Recent Development of Superplasticity in Aluminum Alloys: A Review

Tailoring Microstructure and Properties of Fine Grained Magnesium Alloys by Severe Plastic Deformation

Influence of thermomechanical processing on the grain size, texture and mechanical properties of Mg-Al alloys

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