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A Thermodynamic Assessment of the Inoculation Process in Al-base Alloys
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2007 (English)In: Transactions of the Indian Institute of Metals, ISSN 0019-493X, Vol. 60, no 2-3, 361-365 p.Article in journal (Refereed) Published
Abstract [en]

The binary Al-Ti and the ternary phase diagrams Al-Ti-B and Al-Ti-C are calculated from normal thermodynamic laws. The calculated phase diagrams are used to discuss the formation of Al3Ti during the cooling process. In the binary Al-Ti phase diagram an undercooling of only 30 K is shown to be necessary to nucleate new crystals of Al3Ti. It is shown that both Al3Ti and TiB2 are formed during cooling of an inoculated Al-melt. TiB2 is more easily nucleated than Al3Ti due to its lower solubility product. Al3Ti is assumed to be nucleated on the TiB2 particles. TiC is not stable at the melting point of aluminium and will decompose into Al4C3 and Al3Ti during cooling. It is suggested that Al3Ti is the active reagent for nucleation of Al.

Place, publisher, year, edition, pages
2007. Vol. 60, no 2-3, 361-365 p.
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-5514ISI: 000208324000053Scopus ID: 2-s2.0-44649187838OAI: oai:DiVA.org:kth-5514DiVA: diva2:9905
Note

QC 20100602

Available from: 2006-03-22 Created: 2006-03-22 Last updated: 2017-11-21Bibliographically approved
In thesis
1. On the Nucleation and Inoculation of Metals
Open this publication in new window or tab >>On the Nucleation and Inoculation of Metals
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Latent heat during recalesence and nucleation and post-recalesence temperature was analysed for refractory metals. An effect on latent heat was found by alloying the pure elements with other refractories. Latent heat was found to be 15-65% of tabulated values. Interface energy was evaluated from undercooling experiments. It was found that the dimensionless numbers β (σLs/ σLv) and α can be used to classify elements into distinctive groups and crystallographic structure.

The phase diagrams for Al-Ti, Al-Ti-B and Al-Ti-C as well as inoculation were analysed. It was found that Al nucleates on Al3Ti which nucleates on TiB2. TiC was found to decompose into Al4C3 and Al3Ti.

The inoculation of nodular cast iron with Mg, Ce; Ca and the formation of sulphides and oxides was analysed. The formation of new inclusions during the solidification as well as the formation of graphite is discussed.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. 13 p.
Series
Trita-MG, ISSN 1104-7127 ; 2006:02
Keyword
Solidification, nucleation, inoculation, undercooling, interface energy, refractory metals, latent heat, inclusions, nodular cast iron
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-3893 (URN)
Public defence
2006-03-24, M3, 43:38, Brinellv.64, Stockholm, 10:15 (English)
Opponent
Supervisors
Note
QC 20100602Available from: 2006-03-22 Created: 2006-03-22 Last updated: 2010-06-02Bibliographically approved

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