Superplasticity in a magnesium alloy subjected to isothermal rolling

Galiyev, Arthur; Kaibyshev, Rustam

doi:10.1016/j.scriptamat.2004.04.005

Cited by 60 publications

(28 citation statements)

References 13 publications

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“…This was, in turn, combined with compression plus rolling to achieve a fine grained structure (~3.7 μm). This method achieved a corresponding superplastic elongation that reached ~1100% [4]. This value is greatly superior to some other published papers regarding ZK60 [5][6].…”

Section: Introductionmentioning

confidence: 48%

Superplastic elongation characteristic of fine grained magnesium alloy ZK60

et al. 2010

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This paper employs simple rolling process plus annealing to refine the grain size of magnesium alloy ZK60. This goal is effectively achieved, obtaining grains as fine as ~3.7 μm. Such a specimen shows an elongation of 642%, and its ultimate fracture surface exhibits intergranular separation and significant grain growth. Additionally, the effects of the specimen's geometry and tensile test axis with respect to the rolling direction on superplastic elongation is studied, which has not been done before.

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Section: Introductionmentioning

confidence: 48%

Superplastic elongation characteristic of fine grained magnesium alloy ZK60

et al. 2010

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“…[2,4] Notably the rolling termed as IR is carried out using internal rollers heated up to a temperature of the billet.…”

Section: Communicationmentioning

confidence: 99%

Cost‐Affordable Technique Involving Equal Channel Angular Pressing for the Manufacturing of Ultrafine Grained Sheets of an Al–Li–Mg–Sc Alloy

2010

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Equal channel angular pressing (ECAP) is a widely known processing procedure for the fabrication of ultra-fine grained (UFG) metal and alloys, in which a sample is pressed through a die comprising two channel portions having an L-shaped configuration. [1] Typically, samples are pressed for several consecutive passes through the die to impose very high strains. This technique is especially attractive for the production of semi-finished products from aluminum alloys with the UFG structure for several reasons. First, conventional tool steels, used as a structural material for the ECAP die, allow ECAP processing of aluminum alloys in a wide temperature range. Second, ECAP can be applied to fairly large billets due to the fact that this processing requires a reasonable low load capacity. Third, ECAP is a relatively simple procedure where high strains are introduced into a billet by a simple shear providing sufficient homogeneity of microstructure evolved in this billet under the processing. It is worth noting that the simple shear nature of the plastic deformation during ECAP is very effective for extensive grain refinement in aluminum alloys in comparison with the other deformation methods.At the same time the potential viability of ECAP processing to be implemented into industrial environment is currently limited by three factors.(i) In order to achieve a high impose strain a repetitive ECAP processing is used. The billet must be removed from the ECAP die and reinserted, with or without an interpass rotation. This operation is time-consuming one and requires high labor cost. (ii) Extensive surface cracking and an irregular shape of the outer corner appeared after each pass lead to a necessity of scalping and cutting operations between ECAP passes.A two-step process consisting of modified equal channel angular pressing (ECAP) and subsequent isothermal rolling (IR) was developed to produce thin sheets of aluminum alloys with ultra-fine grained (UFG) structure. Significant increase in the efficiency of ECAP was attained by using flat billets and a back pressure system. The incorporation of final IR into technologic route provides a reduced strain which is necessary to impose for the fabrication of thin sheets with UFG structure. In addition, it allows producing relatively ''long billets.'' In order to demonstrate the feasibility of this technique an Al-5.1Mg-2.1Li-0.17Sc-0.08Zr (wt %) alloy was subjected to ECAP at 325 8C to a total strain of $8 using processing route CX. The operation time of this processing did not exceed 15 min. Subsequent IR at the same temperature with a total reduction of 88% was applied to produce thin sheets with a 1.8 mm thickness and an average size of recrystallized grains of $1.6 mm. These sheets exhibit extraordinary high superplastic ductilities. In addition, this material demonstrated almost isotropic mechanical behavior at room temperature. The maximum elongation-to-failure of $2700% was attained at a temperature of 450 8C and an initial strain rate of 1.4 Â 10 À2 s À1 . Thus it was dem...

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“…A number of investigations have identified that the excellent superplasticity in the ZK60 alloy could be obtained by the severe plastic deformation methods, such as equal channel angular pressing (ECAP), high ratio differential speed rolling (HRDSR) and isothermal rolling. [1][2][3][4][5][6] Figueiredo and Langdon 1) reported an extraordinarily large elongation of 3050% in ECAP ZK60 alloy at 200 C and a strain rate of 1 Â 10 À4 s À1 . Moreover, Lapovok et al 2) achieved a large elongation of 2040% in ECAP ZK60 alloy at 220 C and a strain rate of 3 Â 10 À4 s À1 .…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, Lapovok et al 2) achieved a large elongation of 2040% in ECAP ZK60 alloy at 220 C and a strain rate of 3 Â 10 À4 s À1 . Galiyev and Kaibyshev 3) reported that isothermal rolled ZK60 alloy exhibited a maximum elongation of 1330% at 250 C and 1:4 Â 10 À4 s À1 . The superplasticity of ECAP and isothermal rolled ZK60 alloy was usually obtained at a relatively low temperature and strain rate.…”

Section: Introductionmentioning

confidence: 99%

Superplastic Behavior of Friction Stir Processed ZK60 Magnesium Alloy

Xie

Luo

et al. 2011

Mater. Trans.

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Six millimeter thick extruded ZK60 magnesium alloy plate was subjected to friction stir processing (FSP) at 400 rpm and 100 mm/min, producing fine and uniform recrystallized grains with predominant high-angle grain boundaries of 73%. Maximum elongation of 1800% was achieved at a relatively high temperature of 325 C and strain rate of 1 Â 10 À3 s À1 . Grain boundary sliding was identified to be the primary deformation mechanism in the FSP ZK60 alloy by superplastic data analyses and surface morphology observation. The superplastic deformation kinetics of the FSP ZK60 alloy was faster than that of the high-ratio differential speed rolled ZK60 alloy.

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Superplasticity in a magnesium alloy subjected to isothermal rolling

Cited by 60 publications

References 13 publications

Superplastic elongation characteristic of fine grained magnesium alloy ZK60

Superplastic elongation characteristic of fine grained magnesium alloy ZK60

Cost‐Affordable Technique Involving Equal Channel Angular Pressing for the Manufacturing of Ultrafine Grained Sheets of an Al–Li–Mg–Sc Alloy

Superplastic Behavior of Friction Stir Processed ZK60 Magnesium Alloy

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