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Decrease in the rate of diffusion of hydrogen through layers of bifilm defects in Al melt in the presence of Sr
Shahid Bahonar Univ Kerman, Sch Engn, Dept Met & Mat Sci, Jomhoori Eslami Blvd, Kerman, Iran..
Shahid Bahonar Univ Kerman, Sch Engn, Dept Met & Mat Sci, Jomhoori Eslami Blvd, Kerman, Iran..ORCID-id: 0000-0003-1779-8728
Shahid Bahonar Univ Kerman, Sch Engn, Dept Met & Mat Sci, Jomhoori Eslami Blvd, Kerman, Iran..ORCID-id: 0000-0001-9943-106X
2016 (Engelska)Ingår i: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 29, nr 3, s. 179-185Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The change in the diffusion rate of H through layers of bifilm defects in Al-0.05 wt% Sr melt was investigated by studying the change in the porosity of samples that were held in furnace for different times, subjected to vibration and then solidified under reduced pressure. The results showed that the vibration accelerated the rate of formation of cracks on the layers of the defects, the rate of diffusion of H into their atmosphere and the rate of consumption of Sr in the melt. These rates decreased gradually as the melt was held in the furnace before applying the vibration. This decrease was attributed to the transformation of alumina to Sr-containing oxides, which caused the strength of the layers to increase and the rate of formation of cracks on them to decrease. This behaviour may have an impact on the increase in porosity of Al castings modified by Sr.

Ort, förlag, år, upplaga, sidor
Taylor & Francis, 2016. Vol. 29, nr 3, s. 179-185
Nyckelord [en]
Oxide film defect, Bifilm, Aluminium, Strontium, Healing, Modification
Nationell ämneskategori
Materialteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-263989DOI: 10.1080/13640461.2015.1125645ISI: 000378064700007Scopus ID: 2-s2.0-84978496398OAI: oai:DiVA.org:kth-263989DiVA, id: diva2:1371595
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QC 20191120

Tillgänglig från: 2019-11-20 Skapad: 2019-11-20 Senast uppdaterad: 2019-11-20Bibliografiskt granskad

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