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Correlations between surface and interface energies with respect to crystal nucleation
KTH, Superseded Departments, Casting of Metals.
KTH, Superseded Departments, Casting of Metals.
2002 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 255, no 2, 363-374 p.Article in journal (Refereed) Published
Abstract [en]

The energetic chemical and structural properties of interfaces between solid and liquid metals are of great interest in numerous applications. However, solid-liquid interfacial energies of metals are often determined by nucleation experiments, requiring particular attention to the measurements so obtained. The purpose of this paper is to conduct an analysis of the level of liquid undercooling of 3d-, 4d-, and 5d-transition metals, as well as of other common undercooled elements, through a critical survey of thermophysical data and experimental results. As already pointed out for the liquid-vapor surface energy sigma(LV), the solid-liquid interface energy sigma(LS) determined from the maximum amount of liquid undercooling is well connected to the position of the element in the periodic table, leading to the individualization of each behavior, including the size of the critical nucleus. The beta ratio of sigma(LS)/sigma(LV) is demonstrated to be an interesting dimensionless number by which to classify the elements into distinctive groups. No significant unexplained anomaly is identified, except for Co, supporting the belief that Turnbull's classical theory furnishes a robust support to describe the crystal nucleation in pure elements.

Place, publisher, year, edition, pages
2002. Vol. 255, no 2, 363-374 p.
National Category
Physical Chemistry
URN: urn:nbn:se:kth:diva-5511DOI: 10.1006/jcis.2002.8627ISI: 000179263700020PubMedID: 12505085OAI: diva2:9902
Available from: 2006-03-22 Created: 2006-03-22 Last updated: 2011-09-21Bibliographically 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.
Trita-MG, ISSN 1104-7127 ; 2006:02
Solidification, nucleation, inoculation, undercooling, interface energy, refractory metals, latent heat, inclusions, nodular cast iron
National Category
Materials Engineering
urn:nbn:se:kth:diva-3893 (URN)
Public defence
2006-03-24, M3, 43:38, Brinellv.64, Stockholm, 10:15 (English)
QC 20100602Available from: 2006-03-22 Created: 2006-03-22 Last updated: 2010-06-02Bibliographically approved

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