Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2009-06-01

Journal: MATERIALS CHARACTERIZATION

Included Journals: EI、SCIE

Volume: 60

Issue: 6

Page Number: 482-486

ISSN: 1044-5803

Key Words: Magnesium alloy; Sub-rapid solidification; Microstructure; Microdistribution

Abstract: AZ61 magnesium alloy foils of 0.5-3.0 mm thick were successfully produced by using sub-rapid solidification technique. Microstructures of conventionally solidified (CS) and sub-rapidly solidified (sub-RS) alloys were examined by optical microscope (OM) and scanning electron microscope (SEM). The results showed that the cellular grain of 1.8-13.5 mu m can be obtained during sub-rapid solidification process. Phase compositions and microdistribution of the alloying elements in the foils were analyzed by X-ray diffraction (XRD) and electron probe microanalyzer (EPMA), respectively. The eutectic transformation L ->alpha-Mg+beta-Mg(17)Al(12) and microsegregation in conventionally solidified AZ61 alloy were remarkably suppressed in sub-rapid solidification process. As a consequence, the alloying elements Al, Zn, Mn showed much higher solid solubility and the sub-rapid solidification microstructures dominantly consisted of supersaturated alpha-Mg solid solution. Meanwhile, the beta-Mg(17)Al(12) phases located in the alpha-Mg grain boundaries are largely decreased due to high solidification cooling rate. (C) 2008 Elsevier Inc. All rights reserved.