Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2013-05-01

Journal: JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE

Included Journals: EI、SCIE

Volume: 22

Issue: 5

Page Number: 1319-1323

ISSN: 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.".