Abstract
Double oxide films (bifilms) have been held responsible for the variability in mechanical properties of aluminium castings. It has been suggested that the air entrapped inside a bifilm can react with the surrounding melt leading to its consumption, which might improve the mechanical properties of the castings. In this work, the effect of the holding time of the melt before solidification on the distribution of mechanical properties, and by implication, on entrained double oxide films, was investigated for different aluminium alloys. The Weibull moduli of the plate castings were determined under tensile conditions, and their fracture surfaces examined for evidence of oxide films. The results suggested the occurrence of two competing mechanisms during the holding treatment. The consumption of air inside the bifilms due to reaction with the surrounding molten metal may lead to improvements in mechanical properties, but this may be accompanied by hydrogen passing into the bifilms, which has a deleterious effect on properties.
Original language | English |
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Title of host publication | TMS Annual Meeting |
Pages | 149-156 |
Number of pages | 8 |
Publication status | Published - 2011 |
Event | Shape Casting: 4th International Symposium 2011 in Honor of Prof. John T. Berry - Held During the TMS 2011 Annual Meeting and Exhibition - San Diego, CA, United States Duration: 27 Feb 2011 → 3 Mar 2011 |
Conference
Conference | Shape Casting: 4th International Symposium 2011 in Honor of Prof. John T. Berry - Held During the TMS 2011 Annual Meeting and Exhibition |
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Country/Territory | United States |
City | San Diego, CA |
Period | 27/02/11 → 3/03/11 |
Keywords
- Aluminium
- Casting
- Double oxide film defects
- Mechanical properties
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys