Superplasticity in thin magnesium alloy sheets and deformation mechanism maps for magnesium alloys at elevated temperatures

Kim, Woo Jin; Chung, Sung Wook; Chung, Chin-Sung; Kum, Dong Wha

doi:10.1016/s1359-6454(01)00008-8

Cited by 292 publications

(145 citation statements)

References 17 publications

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“…Thus, hot deformation (such as superplastic forming) has attracted the interest of many investigators of magnesium alloys. [2][3][4][5] The elongations and flow stresses of magnesium alloys at elevated temperatures are indispensable in investigating the hot-forming process. However, analytical data on the flow stress of magnesium alloys are scarce.…”

Section: Introductionmentioning

confidence: 99%

Capacity for Deformation and the Evaluation of Flow Stress of Hot Extruded Mg-8Al-xRE Alloys at Elevated Temperatures

Yang

Koo

2003

Mater. Trans.

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This paper investigated the optimal deformation temperature T c , and the optimal Zener-Hollomon parameter Z c , of both as-extruded Mg8Al and Mg-8Al-2RE alloys, to examine the capacity of these alloys for deformation. Additionally, an equation that involves the ZenerHollomon parameter Z was derived to evaluate the flow stress of these magnesium alloys at various temperatures and strain rates and was validated using a statistical method. These alloys were prepared by melting and casting in a vacuum induction furnace, and extruded at 633 K with a reduction ratio of 90 : 1. Tensile tests were performed at 473 to 723 K and at strain rates ranging from 8:3 Â 10 À4 to 8:3 Â 10 À1 s À1 . The implications of the experimental data were discussed in detail.

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Section: Introductionmentioning

confidence: 99%

Capacity for Deformation and the Evaluation of Flow Stress of Hot Extruded Mg-8Al-xRE Alloys at Elevated Temperatures

Yang

Koo

2003

Mater. Trans.

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“…These values are lower than those corresponding to diffusion of Al atoms in a Mg matrix (143 kJ/mole) and to self-diffusion in Mg (135 kJ/mole) [13] and they are higher than the activation energy for grain boundary diffusion (92 kJ/mol). Kim et al [14] have also reported a value of 121 kJ/mole in an AZ31 alloy tested under conditions where a stress exponent of 3 was measured. Higashi [2] has recently pointed out that both lattice and grain boundary diffusion likely play an important role during superplastic deformation of Mg alloys and therefore an effective diffusion coefficient, D eff , must be considered.…”

Section: Methodsmentioning

confidence: 89%

Superplastic Behavior of a Fine Grained AZ61 Alloy Processed by Large Strain Hot Rolling

Pérez‐Prado

Valle

Ruano

2004

MSF

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Abstract.A processing route based on conventional hot rolling has been recently developed to induce significant grain refinement in Mg alloys. The simplicity and rapidity of the processing route as well as the fact that conventional rolling is used, may allow it to be put into practice successfully in industry. This method consists of only two to three rolling passes, each producing a large thickness reduction, and intermediate annealings of 5 minutes duration. The resulting microstructure is mainly formed by very fine grains. Tensile tests at different temperatures and strain rates were performed in order to analyse the mechanical behaviour of the processed AZ61 alloy under different testing conditions. Microstructure and texture evolution during deformation were examined by optical microscopy (OM) and X-ray diffraction, respectively. It is shown that the microstructures developed by large strain hot rolling are capable of exhibiting significant superplastic elongations at moderate to low temperatures. Stress exponents close to 2 were measured during deformation under optimum superplastic conditions. Additionally, grains remained equiaxed and a significant decrease in the texture intensity is observed. This is consistent with the predominance of grain boundary sliding as the main deformation mechanism responsible for superplasticity.

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“…More and more importance is paid to magnesium alloys due to their high specific strength, good machinability and castability [1]. Many measures have been adopted to improve their mechanical properties [1].…”

Section: Introductionmentioning

confidence: 99%

“…Many measures have been adopted to improve their mechanical properties [1]. However, magnesium alloys are limited to some noncritical parts as a result of the restriction of fatigue strength and creep resistance at high temperatures [2].…”

Section: Introductionmentioning

confidence: 99%

Investigation on low cycle fatigue behaviours of Mg-12Gd-3Y-0.5Zr magnesium alloy

Yang

2016

MATEC Web Conf.

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Abstract. In this paper, low cycle fatigue behaviours of Mg-12Gd-3Y-0.5Zr magnesium alloy under different strain amplitudes were investigated. It shows that Mg-12Gd-3Y-0.5Zr magnesium alloy has good cyclic stabilization. SEM fracture micrograph indicate that fatigue cracks initiate on the surface or subsurface. Low cycle fatigue mechanism of Mg-12Gd-3Y-0.5Zr magnesium alloy under different total strain amplitudes is disscussed in this paper.

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Superplasticity in thin magnesium alloy sheets and deformation mechanism maps for magnesium alloys at elevated temperatures

Cited by 292 publications

References 17 publications

Capacity for Deformation and the Evaluation of Flow Stress of Hot Extruded Mg-8Al-xRE Alloys at Elevated Temperatures

Capacity for Deformation and the Evaluation of Flow Stress of Hot Extruded Mg-8Al-xRE Alloys at Elevated Temperatures

Superplastic Behavior of a Fine Grained AZ61 Alloy Processed by Large Strain Hot Rolling

Investigation on low cycle fatigue behaviours of Mg-12Gd-3Y-0.5Zr magnesium alloy

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