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Comparison of characteristics of two Al based functionally gradient composites reinforced respectively by in situ primary si particles and si/mg2si particles in centrifugal casting

Comparison of characteristics of two Al based functionally g...

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2009重庆市铸造年会

作者： Yanbo Zhai,Changming Liu,Kai Wang,Maohua Zou,Yong Xie College of material science and engineering,Chongqing University,Chongqing 400030,China

Two kinds of Al based functionally gradient composite tubes reinforced by in situ primary si particles alone and primary si/mg2si particles jointly were successfully prepared by centrifugal casting,and their structural and mechanical characters were *** is found,from results of the comparison of structures,that,the former,reinforced with primary si particles,takes a characteristic of particles distribution both in the inner and outer layers,however,the later,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 *** of tests of mechanical property show that 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 *** analysis reveals that existence of mg2si particles is the key factor to form this sudden change of gradient distribution of two kinds of *** mg2si particles with a smaller 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.

关键词： centrifugal casting functionally gradient composites in situ primary si particles in situ mg2si particles

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