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Indexed by:期刊论文

Date of Publication:2013-05-01

Journal:JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE

Included Journals:SCIE、EI

Volume:22

Issue:5

Page Number:1319-1323

ISSN No.:1059-9495

Key Words:Al-based immiscible alloys; electric current pulse; Marangoni; monotectic; synchrotron radiation

Abstract:The evolution of Bi-rich droplets morphology in a solidifying Al-Bi immiscible alloy was directly observed using a synchrotron microradiography technique. The electric current pulse (ECP) was applied to control the solidification process of Al-Bi immiscible alloy. It was found that the electromagnetic pinch force and Marangoni force induced by ECP and temperature gradient, respectively, can significantly affect the distribution of Bi-rich droplets. The electromagnetic pinch force drove the droplets from the center to side; meanwhile, the Marangoni force lifted the droplets from the bottom to the top. As a result, the droplets finally distributed with a manner of "inverted triangle.".