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
,
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