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Survey of key parameters of impurities in aluminium: diffusion coefficients, solubility, and liquidus slopes.

Pearce, J V (2016) Survey of key parameters of impurities in aluminium: diffusion coefficients, solubility, and liquidus slopes. Int. J. Thermophysics, 37 (12). p. 123.

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Abstract

Impurities represent in many cases the largest contribution to the uncertainty associated with fixed points of the International Temperature Scale of 1990 (ITS-90). The effect of impurities on the solidification temperature of ITS-90 metals can be characterised by the liquidus slope, the values of which have recently been characterised for a large number of systems. Two other key parameters are the diffusion coefficient, which provides information on how rapidly diffusion, and hence mixing, proceeds, as well as on the validity of the Scheil model of solidification; and the solubility, which provides information on how much impurity is actually dissolved and hence participates in affecting the solidification temperature. In this study, a comprehensive survey of liquidus slopes, together with a survey of 237 diffusion coefficients and 274 solubilities of impurities in both liquid and solid Al.

Item Type: Article
Keywords: ITS-90, impurities, Aluminium, liquidus slope, diffusion coefficient, solubility
Subjects: Engineering Measurements
Engineering Measurements > Thermal
Identification number/DOI: 10.1007/s10765-016-2128-z
Last Modified: 02 Feb 2018 13:13
URI: http://eprintspublications.npl.co.uk/id/eprint/7337

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