Corrosion resistance of extruded Mg-3Al-1Zn alloy manufactured by adding CaO for the replacement of the protective gases

Nam, Tae Heum; Kim, S.-H.; Kim, J.-G.; Kim, S.-K.

doi:10.1002/maco.201206849

Cited by 10 publications

(3 citation statements)

References 28 publications

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“…Unfortunately, because of the severe oxidation tendency of Mg, which reduces the quality of molten metal during casting, Mg content has been limited to 4.9% or less in commercial 5xxx series alloys. According to a recent study, however, the use of Mg + Al 2 Ca master alloy in the casting process is effective in reducing oxidation of Mg [3][4][5]. Thanks to this, research on Al-xMg (x > 4.9%) alloys having superior mechanical properties has been actively conducted.…”

Section: Introductionmentioning

confidence: 99%

Stretch Forming Behavior and Constitutive Equation of a Modified 5083 Alloy with High Mg Content at Elevated Temperatures

Yang

Lee

Choi

et al. 2021

Metals

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For the purpose of applying a modified 5083 alloy (New 5083M alloy) with high Mg content in various automotive sheet parts, the stretch forming behavior of the 5083M alloy was studied in tensile mode at a wide range of processing conditions. The tensile tests were conducted by using a tensile test machine under the temperature ranges of 100–400 °C and the strain rate ranges of 0.001–1 s−1. The test results showed that the 5083M alloy has superior mechanical properties to that of the commercial 5083 alloy at elevated temperatures. The microstructure before and after the stretch forming was analyzed using optical microscope (OM) equipped with a polarizing filter and electron backscattered diffraction (EBSD) unit. Deformed microstructure was observed under low temperature conditions and dynamic recrystallized microstructure under high temperature conditions. However, regardless of microstructure evolution, developed deformation textures were distributed in orientation distribution functions (ODF) images. In addition, at high temperature and low strain rate condition, complex shaped cavities which were detrimental to mechanical properties appeared at the grain boundary and grain triple junction. Based on the test results data, a constitutive equation predicting the deformation behavior of the 5083M alloy was derived. The calculated curves by the constitutive equation were compared with the measured curves by experiment and agreed well.

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Section: Introductionmentioning

confidence: 99%

Stretch Forming Behavior and Constitutive Equation of a Modified 5083 Alloy with High Mg Content at Elevated Temperatures

Yang

Lee

Choi

et al. 2021

Metals

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show abstract

“…Recently, so-called "ECO Mg" alloys have been invented by introducing CaO to the conventional Mg alloys. Previous studies have reported that Mg oxidation and ignition could be controlled and minimized in various ECO Mg alloys during melting [1][2][3][4], and improved mechanical properties and metallurgical characteristics have been reported [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Gas Metal Arc Welding Using Novel CaO-Added Mg Alloy Filler Wire

Kang

Ahn

Kim

2016

Metals

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Novel "ECO Mg" alloys, i.e., CaO-added Mg alloys, which exhibit oxidation resistance during melting and casting processes, even without the use of beryllium or toxic protection gases such as SF 6 , have recently been introduced. Research on ECO Mg alloys is still continuing, and their application as welding filler metals was investigated in this study. Mechanical and metallurgical aspects of the weldments were analysed after welding, and welding behaviours such as fume generation and droplet transfer were observed during welding. The tensile strength of welds was slightly increased by adding CaO to the filler metal, which resulted from the decreased grain size in the weld metal. When welding Mg alloys, fumes have been unavoidable so far because of the low boiling temperature of Mg. Fume reduction was successfully demonstrated with a wire composed of the novel ECO Mg filler. In addition, stable droplet transfer was observed and spatter suppression could be expected by using CaO-added Mg filler wire.

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“…However, using such preventative measures negatively impacts human health and significantly contributes to global warming. Adding CaO to Mg alloys has recently been shown to control and minimize Mg ignition without needing to use beryllium or protective gas shielding [1,2], thus developing so-called "ECO-Mg" alloys. Moreover, the mechanical properties and damping capacity of ECO-Mg alloys are reportedly superior to those of conventional ones [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of CaO Content on Yb: YAG Disk Laser Weldability of AZ31 Mg Alloy

Kang

Kim

2014

MSF

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Magnesium alloys have recently attracted increased attention as structural materials owing to their low specific gravity. However, they must typically be casted, formed, melted, and even heated under a protective shielding gas to prevent them from oxidizing and igniting. So-called “ECO-Mg” alloys have recently been developed by adding CaO to conventional Mg alloys. ECO-Mg alloys exhibit higher oxidation resistance during melting and superior castability, even when beryllium is not added or toxic protective gasses such as SF6are not used. We laser-welded AZ31 Mg alloys with various CaO contents and examined the mechanical properties of the welds. Increasing the CaO content in the AZ31 increased the burning resistance of the ECO-Mg alloys, thereby suppressing plume generation during laser welding; thus the ECO-Mg alloy welds could be fully penetrated faster than conventional Mg alloy welds. The weld strength also increased with increasing CaO content in the AZ31 because the CaO refined the grains.

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Corrosion resistance of extruded Mg-3Al-1Zn alloy manufactured by adding CaO for the replacement of the protective gases

Cited by 10 publications

References 28 publications

Stretch Forming Behavior and Constitutive Equation of a Modified 5083 Alloy with High Mg Content at Elevated Temperatures

Stretch Forming Behavior and Constitutive Equation of a Modified 5083 Alloy with High Mg Content at Elevated Temperatures

Gas Metal Arc Welding Using Novel CaO-Added Mg Alloy Filler Wire

Effect of CaO Content on Yb: YAG Disk Laser Weldability of AZ31 Mg Alloy

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