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Indexed by:期刊论文

Date of Publication:2017-10-01

Journal:JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY

Included Journals:Scopus、SCIE、EI

Volume:33

Issue:10

Page Number:1134-1140

ISSN No.:1005-0302

Key Words:Sn-Pb alloy; Synchrotron X-ray radiography; Solidification; Microstructure; Electric current

Abstract:In situ synchrotron X-ray radiography was used to study the effect of direct current ( DC) on the grain nucleation and growth of Sn-50 wt.% Pb alloy. The results showed that applying DC adequately during solidification could effectively enhance the grain nucleation and inhibit its growth. Imaging of comparative experiments with varying DC intensity indicated that the final grain size, determined by the competition between grain nucleation and growth, was sensitively dependent on the DC intensity. It was found that the average grain size was decreased from 1632 to 567 mu m with DC density of 1.5 A/mm(2) compared to the case without DC. Beyond this value, raising the current density may cause a significant decrease in the nucleation rate, and thus lead to a coarsening of the grain structure. (C) 2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.