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Article
Determination of liquid diffusion coefficients along a liquidus phase boundary
Metallurgical Transactions B
  • Thomas A. Lograsso, Iowa State University
  • A. Hellawell, Michigan Technological University
Document Type
Article
Disciplines
Publication Date
2-1-1991
DOI
10.1007/BF02672522
Abstract

A method for determination of liquid phase diffusion coefficients along the liquidus curve in a binary alloy is presented. The technique is similar to that proposed by Watson and Hunt [1] but is more applicable to a larger selection of alloy systems. The technique utilizes temperature gradient zone melting (TGZM) to produce compositional adjustments along the length of a stationary sample placed in a temperature gradient. Diffusion coefficients as a function of position and, hence, temperature in the sample are calculated from measurement of the compositional changes occurring during TGZM and the temperature profile in the alloy. Since coefficients can be measured over a wide range of temperatures, the activation energy for diffusion can also be determined. The technique is demonstrated for a Cu-85 wt pct Sn alloy.

Comments

Copyright 1991 ASM International. This paper was published in Metallurgical Transactions B 22 (1991): 21–26, and is made available as an electronic reprint with the permission of ASM International. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplications of any material in this paper for a fee or for commercial purposes, or modification of the content of this paper are prohibited.

Copyright Owner
ASM International
Language
en
Date Available
2013-09-27
File Format
application/pdf
Citation Information
Thomas A. Lograsso and A. Hellawell. "Determination of liquid diffusion coefficients along a liquidus phase boundary" Metallurgical Transactions B Vol. 22 Iss. 1 (1991) p. 21 - 26
Available at: http://works.bepress.com/thomas_lograsso/196/