A model of liquid metals and its relation to the solidification process
2005 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, Vol. 413, 455-459 p.Article in journal (Refereed) Published
X-ray analysis shows that a liquid is build up of clusters of atoms with a certain number of nearest neighbours. The X-ray analysis shows that 8-11 nearest neighbours surround each atom. Each cluster has a crystal-like structure. Between the clusters there are some free atoms and free electrons. The enthalpy of fusion is according to Richard's rule around the gas constant times the temperature of melting and the heat capacity in the liquid state is normally constant and for some metals lower than that in the solid state. For metals with low melting points it will decrease further with increasing temperature. This behaviour of the metals can be explained by the use of statistical mechanics and by assuming that the clusters, observed by X-ray analysis are rotating around a centre of its mass. The cluster model is applied to explain the diffusion rate in liquid metals. The effect of the experimental set upon measurements of diffusion constants is discussed as well as its effect on crystal growth.
Place, publisher, year, edition, pages
2005. Vol. 413, 455-459 p.
liquid, metal, structure, heat capacity, diffusion, solidification
IdentifiersURN: urn:nbn:se:kth:diva-15278DOI: 10.1016/j.msea.2005.09.024ISI: 000234202900075ScopusID: 2-s2.0-29444432773OAI: oai:DiVA.org:kth-15278DiVA: diva2:333319
QC 20100525 QC 201110122010-08-052010-08-052011-10-12Bibliographically approved