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Calorimetric study of the oxidation of Al-Mg alloys for the prediction of healing of the double oxide film defect
Shahid Bahonar Univ Kerman, Dept Met & Mat Sci, Kerman, Iran.;Shahid Bahonar Univ Kerman, Mineral Ind Res Ctr, Kerman, Iran..
Shahid Bahonar Univ Kerman, Dept Met & Mat Sci, Kerman, Iran.;Shahid Bahonar Univ Kerman, Mineral Ind Res Ctr, Kerman, Iran.;Shahid Bahonar Univ Kerman, Dept Met & Mat Sci, Sch Engn, Kerman, Iran..ORCID iD: 0000-0001-9943-106X
Shahid Bahonar Univ Kerman, Dept Met & Mat Sci, Kerman, Iran.;Shahid Bahonar Univ Kerman, Mineral Ind Res Ctr, Kerman, Iran..ORCID iD: 0000-0003-1779-8728
2013 (English)In: Journal of thermal analysis and calorimetry (Print), ISSN 1388-6150, E-ISSN 1588-2926, Vol. 113, no 2, p. 769-777Article in journal (Refereed) Published
Abstract [en]

The oxidation of Al alloys containing 0.3-4.5 wt% Mg in an atmosphere with a very low oxygen partial pressure (< 0.5 ppm, to depict the atmosphere within a double oxide film defect) was studied using differential scanning calorimetry and scanning electron microscopy. The results showed that a newly formed Al2O3 layer held in an Al-Mg melt first transformed to MgAl2O4 spinel and then to MgO. This mechanism was the same for all the Al alloys containing 0.3-4.5 wt% Mg, but the kinetics of the transformations were different and depended on the Mg content of the melt. The results also suggest that the two layers of a double oxide film defect that is held in an Al melt containing 0.3-4.5 wt% Mg can heal (i.e. bond to each other) if held in the liquid metal for a long enough period of time.

Place, publisher, year, edition, pages
Springer, 2013. Vol. 113, no 2, p. 769-777
Keywords [en]
Differential scanning calorimetry, Double oxide film defect, Bifilm, Al-Mg alloys, Healing, MgAl2O4, MgO
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-263995DOI: 10.1007/s10973-012-2810-8ISI: 000321784900045Scopus ID: 2-s2.0-84880506206OAI: oai:DiVA.org:kth-263995DiVA, id: diva2:1371601
Note

QC 20191120

Available from: 2019-11-20 Created: 2019-11-20 Last updated: 2019-11-20Bibliographically approved

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