High Temperature Deformation Behavior of AZ31 Mg Alloy

Lee, B.H.; Shin, Kwang Seon; Lee, Chong Soo

doi:10.4028/www.scientific.net/msf.475-479.2927

Cited by 15 publications

(11 citation statements)

References 7 publications

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“…[6][7][8] On the other hand, a very attractive attribute of this alloy is its superplastic behavior at elevated temperatures. [9][10][11] Superplasticity stretches the limits of formability of several magnesium alloys beyond conventional, offering more opportunities for magnesium usage in the automotive sector.Quite a large number of studies investigating the superplastic behavior of the AZ31 Mg alloy have evolved recently. [11][12][13][14][15][16] These different studies covered the various mechanical aspects and microstructural changes during superplastic deformation in the alloy.…”

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confidence: 99%

“…[9][10][11] Superplasticity stretches the limits of formability of several magnesium alloys beyond conventional, offering more opportunities for magnesium usage in the automotive sector.…”

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confidence: 99%

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confidence: 99%

“…[11][12][13][14][15][16] These different studies covered the various mechanical aspects and microstructural changes during superplastic deformation in the alloy. Yet, no available study covers and combines both, over a wide range of temperatures and strain rates.…”

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Analysis of Superplastic Deformation of AZ31 Magnesium Alloy

Abu-Farha

Khraisheh

2007

Adv Eng Mater

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Environmental and economical issues have been increasingly demanding reduced fuel-consumption and exhaustemission vehicles. Among the different means to satisfy these demands, reduction of mass remains the most influential and least costly one, provided that large cuts of 20-40 % are achieved. [1] Leading automotive manufacturers have shown that more than 50 % of fuel consumption is mass dependent, a fact that keeps increasing the interest in lightweight materials over conventional ones. [2][3][4] Being the lightest constructional metal on earth, it is rather natural and quite expected for magnesium to be receiving such great attention over the last decade. [1,4,5] Magnesium's low density makes it 35 % lighter than aluminum and 78 % lighter than steel. And with proper design considerations, magnesium could replace these two metals in many areas, promising significant weight reductions. Many examples of magnesium auto parts that have evolved recently proof the initial signs of such promises. [3][4][5] However, those examples fall mainly into the cast-components category. Unless magnesium usage is expanded to cover other areas, mainly sheet metal forming, feasible weight reductions will be limited. The metal's inferior ductility at room temperature is a key factor in limiting such an expansion.The AZ31 magnesium alloy is commercially available in sheet form, and possesses good mechanical properties. High strength-to-weight ratio in particular provoked the interest in this alloy for structural components. Warm forming has been carried out to enhance the formability of the alloy, as demonstrated by many investigators who successfully formed various components, some for automotive applications. [6][7][8] On the other hand, a very attractive attribute of this alloy is its superplastic behavior at elevated temperatures. [9][10][11] Superplasticity stretches the limits of formability of several magnesium alloys beyond conventional, offering more opportunities for magnesium usage in the automotive sector.Quite a large number of studies investigating the superplastic behavior of the AZ31 Mg alloy have evolved recently. [11][12][13][14][15][16] These different studies covered the various mechanical aspects and microstructural changes during superplastic deformation in the alloy. Yet, no available study covers and combines both, over a wide range of temperatures and strain rates. Our goal is to develop a multi-scale constitutive model that can describe the superplastic behavior of this alloy under various forming conditions, taking both anisotropy and microstructural evolution into account. The framework of such a model has been already developed by the investigators, based on the continuum theory of viscoplasticity. [17][18] However, to calibrate the model requires various mechanical tests followed by microstructural examination, covering a wide-range of operating conditions.In this study, a comprehensive investigation of the elevated temperature superplastic behavior in the AZ31-H24 magnesium alloy is presented. Uniaxial t...

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confidence: 99%

“…[9][10][11] Superplasticity stretches the limits of formability of several magnesium alloys beyond conventional, offering more opportunities for magnesium usage in the automotive sector.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Analysis of Superplastic Deformation of AZ31 Magnesium Alloy

Abu-Farha

Khraisheh

2007

Adv Eng Mater

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“…Many other investigators studied the behavior of the alloy at higher temperatures, highlighting the effect of various parameters, mainly temperature, strain rate, and texture, on the enhanced ductility of the alloy ( Ref 14,15,[17][18][19][20].…”

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Mechanical Characteristics of Superplastic Deformation of AZ31Magnesium Alloy

Abu-Farha

Khraisheh

2007

J. of Materi Eng and Perform

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As the lightest constructional metal on earth, magnesium (and its alloys) offers a great potential for weight reduction in the transportation industry. Many automotive components have been already produced from different magnesium alloys, but they are mainly cast components. Production of magnesium outer body components is still hindered by the materialÕs inferior ductility at room temperature. Magnesium alloys are usually warm-formed to overcome this problem; however, it was observed that some magnesium alloys exhibits superior ductility and superplastic behavior at higher temperatures. More comprehensive investigation of magnesiumÕs high temperature behavior is needed for broader utilization of the metal and its alloys. In this work, the high temperature deformation aspects of the AZ31B-H24 commercial magnesium alloy are investigated through a set of uniaxial tensile tests that cover forming temperatures ranging between 23 and 500°C, and constant true strain rates between 2 · 10 )5 and 2.5 · 10 )2 s )1 . The study targets mainly the superplastic behavior of the alloy, by characterizing flow stress, elongation-to-fracture, and strain rate sensitivity under various conditions. In addition, the initial anisotropy is also investigated at different forming temperatures. The results of these and other mechanical and microstructural tests will be used to develop a microstructure-based constitutive model that can capture the superplastic behavior of the material.

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