Superplasticity in a rolled Mg–3Al–1Zn alloy by two-stage deformation method

Tan, J.C.; Tan, Ming Jen

doi:10.1016/s1359-6462(02)00101-x

Cited by 54 publications

(12 citation statements)

References 13 publications

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“…[48] Nevertheless, the present elongations compare very favorably with those reported for other Mg-based alloys prepared using alternative processing procedures. For example, there are reports of maximum elongations of 320 pct at a testing temperature of 773 K in a hot-rolled AZ31 (Mg-3 pct Al-1 pct Zn) alloy where dynamic recrystallization occurred during testing, [50] of 360 pct in a cross-rolled AZ31 alloy subjected to dynamic recrystallization at a low temperature and then tensile testing at 723 K, [51] and of 580 pct at 673 K in a hotrolled AZ61 (Mg-6 pct Al-1 pct Zn) alloy. [52] All of these elongations are comparable to those obtained in the present experiments, but the testing temperatures are consistently 100 °C to 200 °C higher.…”

Section: Discussionmentioning

confidence: 99%

Achieving enhanced ductility in a dilute magnesium alloy through severe plastic deformation

Matsubara

Miyahara

Horita

et al. 2004

Metall Mater Trans A

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Experiments were conducted to evaluate the utility of a new processing procedure developed for Mg-based alloys in which samples are subjected to a two-step processing route of extrusion followed by equal-channel angular pressing (designated as EX-ECAP). The experiments were conducted using a Mg-0.6 wt pct Zr alloy and, for comparison purposes, samples of pure Mg. It is shown that the potential for successfully using ECAP increases in both materials when adopting the EX-ECAP procedure. For the Mg-Zr alloy, the use of EX-ECAP produces a grain size of ϳ1.4 m when the pressing is undertaken at 573 K. By contrast, using EX-ECAP with pure Mg at 573 K produces a grain size of ϳ26 m. Tensile testing of the Mg-Zr alloy at 523 and 573 K after processing by EX-ECAP revealed the occurrence of significantly enhanced ductilities with maximum elongations of ϳ300 to 400 pct.

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Section: Discussionmentioning

confidence: 99%

Achieving enhanced ductility in a dilute magnesium alloy through severe plastic deformation

Matsubara

Miyahara

Horita

et al. 2004

Metall Mater Trans A

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“…Thus, hot rolling, extrusion, and forging have been used commercially to produce magnesium plates, rods, and tubes. Recently, applications of the superplastic pressing (or forming or forging) technique to magnesium alloys have attracted much attention, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] and this may effectively produce complex engineering components directly from the wrought products. It is expected that superplastic pressing for commercial low-priced magnesium alloys could be developed into one important future fabrication means for the automobile, architecture, and electronic appliance industries.…”

Section: Introductionmentioning

confidence: 99%

Transition of dominant diffusion process during superplastic deformation in AZ61 magnesium alloys

Wang

Huang

2004

Metall Mater Trans A

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The superplastic behavior of the AZ61 magnesium alloy sheet, processed by one-step hot extrusion and possessing medium grain sizes of ϳ12 m, has been investigated over the temperature range of 523 to 673 K. The highest superplastic elongation of 920 pct was obtained at 623 K and a deformation rate of 1 ϫ 10 Ϫ4 s Ϫ1 . In the lower and higher strain rate regimes, with apparent m values of ϳ0.45 and ϳ0.25, respectively, grain-boundary sliding (GBS) and dislocation creep appeared to dominate the deformation, consistent with the scanning electron microscopy (SEM) examination. The SEM examination also revealed that individual GBS started to operate from the very initial deformation stage in the strain rate range with m ϳ 0.45, which was attributed to the relatively high fraction (88 pct) of high-angle boundaries. The analyses of the superplastic data over 523 to 673 K and 5 ϫ 10 Ϫ5 to 1 ϫ 10 Ϫ3 s Ϫ1 revealed a true stress exponent of ϳ2, and the activation energy was close to that for grain-boundary and lattice diffusion of magnesium at 523 to 573 K and 573 to 673 K, respectively. The transition temperature of activation energy is ϳ573 K, which is attributed to the change in the dominant diffusion process from grain-boundary diffusion to lattice diffusion. It is demonstrated that the effective diffusion coefficient is a valid parameter to characterize the superplastic behavior and the dominant diffusion process.

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“…Garofalo parameters with strain. On the other hand, from various investigations [8,24,36,54,59,60] we selected the characteristic values that are more representative of the DRX processes in the AZ31 magnesium alloy in the temperature range of our work.…”

Section: Resultsmentioning

confidence: 99%

A New Constitutive Strain-Dependent Garofalo Equation to Describe the High-Temperature Processing of Materials—Application to the AZ31 Magnesium Alloy

Rieiro

Gutiérrez

Castellanos

et al. 2010

Metall Mater Trans A

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Superplasticity in a rolled Mg–3Al–1Zn alloy by two-stage deformation method

Cited by 54 publications

References 13 publications

Achieving enhanced ductility in a dilute magnesium alloy through severe plastic deformation

Achieving enhanced ductility in a dilute magnesium alloy through severe plastic deformation

Transition of dominant diffusion process during superplastic deformation in AZ61 magnesium alloys

A New Constitutive Strain-Dependent Garofalo Equation to Describe the High-Temperature Processing of Materials—Application to the AZ31 Magnesium Alloy

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