Yu Sirong 

Zhang Xinping

He Zhenming

Liu Yaohui

College of Materials Science
and Engineering,
Jilin University,
Changchun 130025, China

FIELDS*

Abstract: Based on continuum theory and moving law of particles, a model is presented to obtain gradient distribution of particles in centrifugal accelerating field, by which the particle distribution in gradient composite material can be predicted. The simulation shows with increases in rotating time, four regions gradually appear from the internal periphery to the external one, they are free region, transition region, steady region and surface reinforced region, and the latest three regions are defined as a rich region. Finally, the steady region disappears, and the rich region only includes transition region and surface reinforced region. The influences of centrifugal acceleration coefficient G, primary volume fraction j₀，pouring temperature q_p and density difference between the particle and the metal matrix on particles gradient distribution are studied in detail. The results of the theoretical analysis agree with experiment ones. Both of analysis and experiment results indicate that with the increase in G and q_p, the particle distribution becomes more centralized and the consistence of particle in the surface periphery becomes larger.