Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 20    No. 3    March 2010

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Characteristics of two Al based functionally gradient
composites reinforced by primary Si particles and Si/
in situ Mg2Si particles in centrifugal casting
ZHAI Yan-bo(翟彦博), LIU Chang-ming(刘昌明), WANG Kai(王 开), ZOU Mao-hua(邹茂华), XIE Yong(谢 勇)

College of Material Science and Engineering, Chongqing University, Chongqing 400030, China

Abstract:Two kinds of Al based functionally gradient composite tubes reinforced by primary Si particles alone and primary Si/ in situ Mg2Si particles jointly were successfully prepared by centrifugal casting, and their structural and mechanical characters were compared. It is found that the composite reinforced with primary Si particles takes a characteristic of particles distribution both in the inner and outer layers. However, composite reinforced with primary Si/Mg2Si particles jointly takes a characteristic of particles distribution only in the inner layer and shows a sudden change of particles distribution across the section of inner and outer layers. The hardness and wear resistance of Al-19Si-5Mg tube in the inner layer are greatly higher than that in the other layers of Al-19Si-5Mg tube and Al-19Si tube. Theoretical analysis reveals that the existence of Mg2Si particles is the key factor to form this sudden change of gradient distribution of two kinds of particles. Because Mg2Si particles with a lower density have a higher centripetal moving velocity than primary Si particles, in a field of centrifugal force, they would collide with primary Si particles and then impel the later to move together forward to the inner layer of the tube.

 

Key words: centrifugal casting; functionally gradient composites; in situ primary Si particles; in situ Mg2Si particles

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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