High temperature oxidation of AZ31+0.3wt.%Ca and AZ31+0.3wt.%CaO magnesium alloys

Lee, Dong Bok

doi:10.1016/j.corsci.2013.01.036

Cited by 78 publications

(22 citation statements)

References 21 publications

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“…1(b)). Since extrusion refined grain boundaries of the α-Mg matrix, Al 2 Ca that precipitated along grain boundaries during casting [5][6][7] realigned along the extrusion direction as shown in Fig. 1(b).…”

Section: Methodsmentioning

confidence: 99%

“…CaO powder was found to transform to Al 2 Ca particles along the grain boundaries of the α-Mg matrix [5]. During casting and oxidation at high temperatures, a thin CaO surface scale formed over the MgO scale to protect the CaO-added Mg alloy ingots from vigorous oxidation [5,6]. However, it is necessary to study the microstructure and hightemperature oxidation behavior of CaO-added Mg alloys fabricated into thin plates, because such forms are generally used commercially.…”

Section: Introductionmentioning

confidence: 99%

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High Temperature Oxidation Behavior of Mg-6%Al-1%Zn-1%CaO Alloys

Lee¹,

Kim²

2017

Journal of the Korean institute of surface engineering

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The magnesium-base AZ61 alloy was cast while adding 1% CaO powder into the melt. It was hot extruded, and oxidized at 550-650 o C in air in order to study its microstructure and oxidation behavior. Initially added CaO powder reacted with Al in the melt to Al 2 Ca particles that aligned along the extrusion direction. The formed Al 2 Ca particles increased the oxidation resistance through forming the superficial CaO scale at the upper part of the thin MgO oxide scale.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High Temperature Oxidation Behavior of Mg-6%Al-1%Zn-1%CaO Alloys

Lee¹,

Kim²

2017

Journal of the Korean institute of surface engineering

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“…Comparing both filler wires shows that fume generation was reduced when the AZ31-B filler wire was used. In the case of the CaO-containing Mg alloy, a thin CaO-rich barrier layer was formed at the surface; this layer can successfully suppress rapid oxidation and burning during the melting process [4]. During welding, the filler wire was melted and a droplet was formed at the end of the wire.…”

Section: Welding Characteristicsmentioning

confidence: 99%

“…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, because Ca is more active, usually in the form of intermediate alloy to join, thereby enhancing the cost of the alloy. In recent years, scholars tried to replace Ca by CaO, added to the magnesium alloy and to explore more low cost to improve the performance of magnesium alloys, the study found that CaO has the advantages of low price, easy storage and add, with good research and application potential [5][6][7][8]. In this paper, the microstructure and properties of as cast AZ81 magnesium alloy were studied by using the as cast AZ81 magnesium alloy as the matrix and the trace amount of CaO.…”

Section: Introductionmentioning

confidence: 99%

Influence of Trace CaO on Microstructure and Mechanical Properties of As-cast AZ81 Magnesium Alloy

Chen¹,

Li²,

Zhou³

et al. 2017

dtmse

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By using optical microscope and scanning electron microscope to observe the morphology in as-cast AZ81 magnesium alloy with the addition of CaO (0.1wt.%, 0.5wt.%, 0.9wt.%). Analysis the alloy phase by X-ray diffraction, test the mechanical properties of the alloy by using of the sophisticated electronic universal tensile testing machine. The study found that: the alloy is mainly composed of α-Mg matrix and Mg17Al12 phase, trace CaO interacted with Mg and Al in the alloy interacted generated a new phase Al2Ca and Mg2Ca, the addition of CaO improved the microstructure of cast AZ81 magnesium alloy, reduced the reunion of Mg17Al12 on grain boundary and had some effects on the refinement of alloy grain, improved the mechanical properties of AZ81 magnesium alloy. When the CaO content is 0.5%, the tensile strength of as-cast AZ81 magnesium alloy at room temperature is 173 MPa which is increased by about 9.8% compared to the tensile strength of AZ81's 142 MPa at room temperature.

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High temperature oxidation of AZ31+0.3wt.%Ca and AZ31+0.3wt.%CaO magnesium alloys

Cited by 78 publications

References 21 publications

High Temperature Oxidation Behavior of Mg-6%Al-1%Zn-1%CaO Alloys

High Temperature Oxidation Behavior of Mg-6%Al-1%Zn-1%CaO Alloys

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

Influence of Trace CaO on Microstructure and Mechanical Properties of As-cast AZ81 Magnesium Alloy

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