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A model of liquid metals and its relation to the solidification process
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Materialens processteknologi.
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Materialens processteknologi.
2005 (engelsk)Inngår i: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 413, s. 455-459Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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.

sted, utgiver, år, opplag, sider
2005. Vol. 413, s. 455-459
Emneord [en]
liquid, metal, structure, heat capacity, diffusion, solidification
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-15278DOI: 10.1016/j.msea.2005.09.024ISI: 000234202900075Scopus ID: 2-s2.0-29444432773OAI: oai:DiVA.org:kth-15278DiVA, id: diva2:333319
Merknad

QC 20100525 QC 20111012

Tilgjengelig fra: 2010-08-05 Laget: 2010-08-05 Sist oppdatert: 2017-12-12bibliografisk kontrollert

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