Evaluation of unusual change in contact angle between MgO and molten magnesium

Fujii, Hidetoshi; Izutani, Shun; Matsumoto, Taihei; Kiguchi, Shoji; Nogi, Kiyoshi

doi:10.1016/j.msea.2005.10.055

Cited by 29 publications

(9 citation statements)

References 11 publications

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“…22, 204 also shown in Ref. 205. At melting temperature of magnesium of 650uC, its vapour pressure reaches 360 Pa and is about eight orders of magnitude higher than Al and seven orders higher than Zn, measured at their melting points (Table 5).…”

Section: Rate Of Mg Evaporationsupporting

confidence: 54%

“…224 In this process, wetting of MgO by molten Mg is of importance because it prevents pore formation by forming a sound metal–oxide interface. 205 The morphology of entrapped oxide in an Mg alloy depends on its chemistry and covers equiaxed, granular, nodular or platelike shapes. 225 The higher aluminium content results in an increase in plate-like shapes at the expense of equiaxed ones, as detected based on an acoustic impedance technique.…”

Section: Liquid-state Oxidationmentioning

confidence: 99%

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The reactive element effect on high-temperature oxidation of magnesium

Czerwiński

2015

International Materials Reviews

101

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It was discovered over 75 years ago that minor additions of elements with high affinity to oxygen exert a profound effect on oxidation resistance of many metals and alloys. In this report, progress in understanding the 'reactive element effect' (REE) and opportunities created for controlling the high-temperature oxidation of magnesium alloys were reviewed. Magnesium, the lightest structural metal, exhibits high affinity to oxygen and, as opposed to heat-resistant materials, does not form a dense, slow-growing and protective oxide layer. However, additions of small amounts of reactive elements (REs) to magnesium alloys produce a number of positive effects in improving their oxidation resistance. What is of crucial importance for magnesium is that RE benefits are also extended to its ignition, flammability, evaporation and liquid-state reactivity. The mechanism by which these elements influence oxidation and other related behaviour remains, so far, unclear. Although no specific theory explaining the REE on magnesium has been developed, growth kinetics, surface morphology and internal microstructure of magnesia films and scales, doped with REs show characteristics typical for high-temperature materials that form protective oxides.

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Section: Rate Of Mg Evaporationsupporting

confidence: 54%

Section: Liquid-state Oxidationmentioning

confidence: 99%

The reactive element effect on high-temperature oxidation of magnesium

Czerwiński

2015

International Materials Reviews

101

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“…The sessile drop method [17] was used to study the wetting behavior of molten pure Mg droplets on pure Ti substrate. The contact angle for an Mg droplet, indicating its wettability, is calculated using Young's equation as mentioned above.…”

Section: Methodsmentioning

confidence: 99%

Wettability of pure Ti by molten pure Mg droplets

et al. 2010

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“…[1][2][3] Surface oxidation of LMs can dramatically change the surface tension which will have a significant effect on the way LMs wet different surfaces. 4,5 This is important for the process, such as soldering, brazing, casting and so on. There are considerable differences between the ways oxidation develops in various LMs.…”

Section: Introductionmentioning

confidence: 99%

“…Oxide films easily form on the free surface of LMs even under high vacuum conditions, especially for reactive elements such as Al and Mg. For example, an atomic scale oxide free aluminium surface in thermodynamic equilibrium is not easy to achieve because the maximum oxygen partial pressure that is in equilibrium with physically dissolved oxygen is very low (up to 10 −4 bar) 1 – 3. Surface oxidation of LMs can dramatically change the surface tension which will have a significant effect on the way LMs wet different surfaces 4,5. This is important for the process, such as soldering, brazing, casting and so on.…”

Section: Introductionmentioning

confidence: 99%

Transition of amorphous to crystalline oxide film in initial oxide overgrowth on liquid metals

Men

Fan

2011

Materials Science and Technology

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It is important to understand the mechanism of oxidation in the initial stage at free surface on liquid metals. Mittemeijer and co-workers recently developed a thermodynamic model to study the oxide overgrowth on a solid metal surface. Based on this model, we have developed a thermodynamic model to analyze the thermodynamic stability of oxide overgrowth on liquid metals. The thermodynamic model calculation revealed that the amorphous oxide phase is thermodynamically preferred up to 1.3 and 0.35nm, respectively, in the initial oxide overgrowth on liquid Al and Ga at the corresponding melting point. However, the amorphous phase is thermodynamically unstable in the initial oxide overgrowth on liquid Mg. The thermodynamic stability of amorphous phase in the Al and Ga oxide systems is attributed to lower sums of surface and interfacial energies for amorphous phases, compared to that of the corresponding crystalline phases. AbstractIt is important to understand the mechanism of oxidation in the initial stage at free surface on liquid metals. Mittemeijer and co-workers recently developed a thermodynamic model to study the oxide overgrowth on a solid metal surface. Based on this model, we have developed a thermodynamic model to analyze the thermodynamic stability of oxide overgrowth on liquid metals. The thermodynamic model calculation revealed that the amorphous oxide phase is thermodynamically preferred up to 1.3 and 0.35 nm, respectively, in the initial oxide overgrowth on liquid Al and Ga at the corresponding melting point. However, the amorphous phase is thermodynamically unstable in the initial oxide overgrowth on liquid Mg. The thermodynamic stability of amorphous phase in the Al and Ga oxide systems is attributed to lower sums of surface and interfacial energies for amorphous phases, compared to that of the corresponding crystalline phases.

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Evaluation of unusual change in contact angle between MgO and molten magnesium

Cited by 29 publications

References 11 publications

The reactive element effect on high-temperature oxidation of magnesium

The reactive element effect on high-temperature oxidation of magnesium

Wettability of pure Ti by molten pure Mg droplets

Transition of amorphous to crystalline oxide film in initial oxide overgrowth on liquid metals

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