Effect of alloying elements on the ignition resistance of magnesium alloys

Kumar, Navneet; Blandin, J.J.; Suéry, M.; Grosjean, Elise

doi:10.1016/s1359-6462(03)00263-x

Cited by 168 publications

(54 citation statements)

References 5 publications

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“…(Table II), the outer layer (symbol 2) is the mixture of Y 2 O 3 and Ce 0.202 Y 0.798 O 1.601 , and the inner layer (symbol 3) is mainly Mg and MgO with a little Y 2 O 3 . Ravi Kumar [27] found analogous results in WE43 alloy with 4 wt pct Y addition. In his experiments, the WE43 alloy did not burn up to 1020 K, and the oxide layer is mainly composed of Y, Mg, and O.…”

Section: X-ray Diffraction Examinationmentioning

confidence: 57%

Surface oxidation behavior of Mg-Y-Ce alloys at high temperature

Fan

Cheng

Xie

et al. 2005

Metall Mater Trans A

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After the Mg-Y-Ce magnesium alloy was exposed to air at a temperature up to 1173 K for 0.5 hours, the dense and compact oxide film formed on the surface. Accordingly, oxidation and ignition of magnesium alloys at elevated temperature was successfully retarded by the Y and Ce additions. Thermogravimetric measurements in air revealed that the oxidation dynamics curves measured at 673 and 773 K followed the parabolic-line law and the curve investigated at 873 K followed the complicate quartic law. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis indicated that the oxide film on the surface of Mg-Y-Ce alloys exhibited a duplex structure, which agreed with the results of thermodynamic analysis. The oxidation film included two layers: the outer layer was a multiple structure of Ce 0.202 Y 0.798 O 1.601 and Y 2 O 3 , and the inner layer mainly consisted of metal Mg and MgO.

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Section: X-ray Diffraction Examinationmentioning

confidence: 57%

Surface oxidation behavior of Mg-Y-Ce alloys at high temperature

Fan

Cheng

Xie

et al. 2005

Metall Mater Trans A

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“…Ca was more effective than CaO in improving resistance, which was reasonable considering the dissociation of CaO during melting. The ignition temperature of the AZ91 alloy reported elsewhere was 858 K. 10) This difference in temperature is attributed to the fact that ignition strongly depends on the heating rate, alloy chemistry, and specimen geometry because high specific area promotes ignition. It is noted that the EPMA analyses indicated that Zn was incorporated throughout the scale as the minor element.…”

Section: Resultsmentioning

confidence: 93%

Effect of Ca and CaO on the High Temperature Oxidation of AZ91D Mg Alloys

2008

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Magnesium alloys of AZ91D, AZ91D + (1, 3, 5) mass% Ca, and AZ91D + (0.5, 1) mass% CaO were cast and oxidized at high temperature in atmospheric air in order to study the effect of Ca and CaO on the oxidation. The microstructure of the CaO-added alloys was similar to that of the Ca-added alloys. Ca and CaO both formed Al 2 Ca in the alloys, but Ca was more effective than CaO in increasing the oxidation resistance of Mg alloys. The microstructure and composition of the scale formed on the CaO-added alloys were similar with those on the Ca-added alloys.

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“…Therefore, two major melt protection techniques are under development. The first involves improving the ignition resistance of molten magnesium alloys with an addition of alloying elements [5][6][7], and the second involves the use of alternative protecting gases such as SO 2 or HFC-134a [8]. A method of such an addition of alloying elements has many advantages compared to the use of a protecting gas.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Ca content on the microstructural evolution of Ca containing AZ31 cast alloys

2011

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Microstructural changes with varying amounts of Ca in cast AZ31-xCa (x: 0.7 wt.%, 2.0 wt.%, 5.0 wt.%) alloys were investigated. According to transmission electron microscopy (TEM) analyses, it was experimentally confirmed that the C36-(Mg,Al)2Ca phase with a di-hexagonal structure formed at interdendritic regions in as-cast AZ31 alloys with no more than 2 wt.% Ca. On the other hand, as the Ca content exceeded 2 wt.%, the lamellar structure consisting of the α-Mg phase and the Mg2Ca phase with a C14 structure formed at interdendritic regions instead of C36 phase. Plate-like Al2Ca precipitates with a C15 structure also formed on the basal plane inside the α-Mg grains.

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Effect of alloying elements on the ignition resistance of magnesium alloys

Cited by 168 publications

References 5 publications

Surface oxidation behavior of Mg-Y-Ce alloys at high temperature

Surface oxidation behavior of Mg-Y-Ce alloys at high temperature

Effect of Ca and CaO on the High Temperature Oxidation of AZ91D Mg Alloys

Effect of the Ca content on the microstructural evolution of Ca containing AZ31 cast alloys

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