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THEORETICAL ANALYSIS OF PARTICLE DISTRIBUTION IN GRADIENT COMPOSITE BY CENTRIFUGAL CASTING

LIU Qingmin , JIAO Yuning , YANG Yuamheng , HU ZhuangqiInstitute of Metal Research. Chinese Academy of Sciences , Shenyang , China Manuscript received 26 April , 1994

金属学报(英文版)

A theoretical analysis was presented to produce gradient composite by centrifugal casting. Particle movement in liquid metal is described and gradient distribution of particles in composite is calculated in a centrifugal field. The factors affected the gradient distribution are discussed in detail. There exist composite zone and blank zone in gradient composite, which was proved by experiments. Finally, a theoretical analysis is given to explain the above mentioned particle distribution.

关键词: gradient composite , null

INVESTIGATION ON MECHANICALLY ALLOYED SUPERSATURATED NANOCRYSTALLINE Al-Ti ALLOYS

FAN Guojiang , QUAN Mingxiu , HU ZhuangqiInstitute of Metal Research. Chinese Academy of Sciences , Shenyang , China Manuscript received 6 May , 1994

金属学报(英文版)

The Al_(100-x)Ti_(x)(x = 5,10,15,35) mixed powders were mechanically alloyed in a planetary bull mill. It was found that the initial composition strongly affects the final productsi a mixture of supersaturated solid solution Al(Ti) and a fee phase for x = 5 and 10; and a single supersaturated solid solution Al(Ti)for x=15 and 35. With inereasing Ti contents from 5at% to 35at%, the grain size of solid solution Al(Ti) decreased from 40nm to 10nm. The results suggest that fast diffusion along nanocrystalline grain boundary is the main alloying process. DSC curves and TEM observation indicate that the solute atom segregation can thermally stabilize the nanocrvstalline solid solutions.

关键词: mechanical alloy ing. fast diffusion , null

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