Determination of the solute diffusion coefficient by the droplet migration method

TitleDetermination of the solute diffusion coefficient by the droplet migration method
Publication TypeJournal Article
Year of Publication2007
AuthorsLiu S, Teng J, Choi JY
Journal TitleMetallurgical and Materials Transactions a-Physical Metallurgy and Materials Science
Volume38A
Pages1555-1562
Date PublishedJul
Type of ArticleProceedings Paper
ISBN Number1073-5623
Accession NumberISI:000248511300021
Keywordsbinary-alloys, CELLULAR DENDRITES, FORCED VELOCITY, LIQUID DROPLETS, solidification, SUCCINONITRILE, system
Abstract

Further analysis of droplet migration in a temperature gradient field indicates that different terms can be used to evaluate the solute diffusion coefficient in liquid (DL) and that there exists a characteristic curve that can describe the motion of all the droplets for a given composition and temperature gradient. Critical experiments are subsequently conducted in succinonitrile (SCN)-salol and SCN-camphor transparent alloys in order to observe dynamic migration processes of a number of droplets. The derived diffusion coefficients from different terms are the same within experimental error. For SCN-salol alloys, D-L = (0.69 +/- 0.05) x 10(-1) mm(2)/s, and for SCN-camphor alloys, D-L = (0.24 +/- 0.02) x 10(-3) mm(2)/s.

DOI10.1007/s11661-007-9164-x
Alternate JournalMetall. Mater. Trans. A-Phys. Metall. Mater. Sci.