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Indexed by:期刊论文

Date of Publication:2008-08-01

Journal:CHINA FOUNDRY

Included Journals:SCIE、Scopus

Volume:5

Issue:3

Page Number:194-198

ISSN No.:1672-6421

Key Words:functionally graded materials (FGM); aluminum alloys; ultrasonic cavitation; acoustic streaming; degassing

Abstract:Functionally graded materials (FGM) have been widely used in many industries such as aerospace, energy and electronics. In this experimental study of fabricating FGM, an approach was developed to prepare Al/Si FGM using power ultrasonic separation method. Material sample with continuously changing composition and performance/properties was successfully produced. Results showed that the microstructure of the FGM sample transited, from its top to bottom, from the hypereutectic structure with a large quantity of primary Si gradually to the eutectic, and finally to the hypoeutectic with numerous primary Al dendrites. The distribution of primary Si and microhardness of the FGM sample also presented graded characteristics, resulting that the wear resistance of the FGM sample decreased from top to bottom. Preliminary discussion was made on the mechanism of the formation of Al/Si FGM.