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Sakamoto, Masao; Akiyama, Shun-ichiro; Ōgi, Keisaku

doi:10.1023/a:1018526708423

Cited by 183 publications

(68 citation statements)

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“…Therefore, Figs. 9(a)9(c) show that the fluorine content increased with increasing melt temperature, 11,12) exposure time and SF 6 concentration. There were some differences between the N 2 and CO 2 carrier gases.…”

Section: Surface Film Compositionmentioning

confidence: 97%

Protective Properties of SF<sub>6</sub> under Various Carrier Gases for the Protection of Molten Mg

et al. 2013

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Molten magnesium can oxidize rapidly in atmospheres containing oxygen. During the casting and handling of molten magnesium, it is essential to protect the melt from ignition. The protective gas normally contains air and/or CO 2 , and with a small amount of an inhibiting agent. This study examined the minimum amount of SF 6 gas needed depending on the type of carrier gas, as well as the effects of the melt temperature, exposure time and SF 6 concentration on the surface film of molten magnesium. The analysis methods of the surface film included the XPS/depth profile and SEM/EDS. The minimum amount of SF 6 gas concentration determined over a wide a range of different carrier gases, such as air, N 2 and CO 2 . The surface film thickness decreased with increasing SF 6 concentration under all conditions, such as the melt temperature, exposure time and different carrier gas.

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Section: Surface Film Compositionmentioning

confidence: 97%

Protective Properties of SF<sub>6</sub> under Various Carrier Gases for the Protection of Molten Mg

et al. 2013

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“…5,6) Calcium has potential to further reduce the density of Mg-Li alloys and, with its limited solid solubility, to provide strength through forming a second phase(s), to inhibit the ignition of molten magnesium and to reduce solid oxidation of Mg-Li alloys. [7][8][9] Mixed RE elements and Ca in the AZ91 Alloys can not only improve the ultimate tensile strength, but also improve the corrosion resistance due to the formation of the reticular Al 2 Ca phase which acted as an effective barrier against corrosion. 10,11) The aim of present work was to study the interaction of Ca and Ce elements with addition of Al element on the microstructure and mechanical properties of different lithium content dual phase Mg-Li alloys.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of the As-Cast and Extruded Mg-(6-11)Li-3Al-Ce-Ca Alloys

Cheng

Cao

et al. 2010

Mater. Trans.

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Samples of (A) Mg-6.86Li-3.02Al-1.12Ce-0.7Ca, (B) Mg-8.15Li-3.07Al-1.12Ce-0.72Ca and (C) Mg-10.54Li-3.54Al-1.23Ce-0.94Ca alloys are prepared by casting and extrusion process. The microstructure and mechanical properties of alloys are characterized. The results indicate that the as-cast specimens of (A) and (B) have þ dual phase structure and the as-cast (C) alloy has phase (Li), þ eutectic structure. Bulk and rod-like Al 2 Ce and Al 2 Ca compounds are found in matrix and boundaries in all the alloys. The orientation relationship between a type of Al 2 (Ce, Ca) phase and the phase is confirmed, i.e., ½ " 1 112 == ½7 " 2 2 " 5 53, ð1 " 1 11Þ == ð01 " 1 1 " 1 1Þ. For the extruded alloys, the microstructures are refined and the phase has the effect of coordination during deformation. The long rod-like and bulk compounds become short rods and fine clumps distributing evenly in the extruding direction. The microstructure of extruded Mg-10.54Li-3.54Al-1.23Ce-0.94-Ca alloy testifies the existence of the eutectic structure. The tensile strength and yield strength of Mg-6.86Li-3.02Al-1.12Ce-0.7Ca (UTS: 12.5%, YS: 36%) and Mg-8.15Li-3.07-Al-1.12Ce-0.72Ca (UTS: 24%, YS: 46%) alloys have improved after extruding process.

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“…There are two major melt protection techniques to be developed. One is improvement of ignition resistance of molten magnesium alloys by addition of alloying elements [16][17][18][19] and the other is using other gas such as SO 2 and HFC134a. 20,21) The method of addition of alloying elements has several advantages compared to using protection gas.…”

Section: Introductionmentioning

confidence: 99%

“…There have been many studies about the effects of Ca on ignition resistance and mechanical properties. [14][15][16][17][18][19][20][21][22][23] Although the corrosion resistance is one of important factors in aspects of application, there is little study about the corrosion behavior of magnesium alloys containing Ca. In this study, the effect of Ca on corrosion resistance of gravity cast AZ31+xCa alloys containing 0$5 mass%Ca was investigated experimentally and analyzed in aspects of microstructural change by means of observation of microstructure and measurement of corrosion potential and average corrosion rate.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ca Addition on the Corrosion Resistance of Gravity Cast AZ31 Magnesium Alloy

2007

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The effect of Ca addition on the corrosion resistance of AZ31 magnesium alloys was evaluated by observation of microstructure and measurement of corrosion potential and average corrosion rate. The main mechanism of corrosion of AZ31+xCa (x ¼ 0$5 mass%) alloys was galvanic-corrosion between -Mg and second phase. But the propagation behavior of corrosion was different with Ca content. In the alloy containing below 0.7 mass%Ca, a micro-galvanic cell formed between matrix -Mg and second phase formed semi-continuously at grain boundaries and the corrosion progressed in transgranular mode. The propagation of corrosion was retarded when the corrosion front met the second phase acted as corrosion barrier. But in the alloys containing above 1 mass%Ca, a micro-galvanic cell formed between eutectic -Mg and discontinuous second phase in the eutectic region and the corrosion rapidly progressed along eutectic -Mg formed continuously at grain boundaries because the discontinuous second phase could not prohibit the propagation of corrosion effectively.

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Cited by 183 publications

References 0 publications

Protective Properties of SF<sub>6</sub> under Various Carrier Gases for the Protection of Molten Mg

Protective Properties of SF<sub>6</sub> under Various Carrier Gases for the Protection of Molten Mg

Microstructure and Mechanical Properties of the As-Cast and Extruded Mg-(6-11)Li-3Al-Ce-Ca Alloys

Effect of Ca Addition on the Corrosion Resistance of Gravity Cast AZ31 Magnesium Alloy

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