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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.42  No.8 (2001)  >  pp.1710-1716

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Microstructural Stability of Gas-Atomized Al-Based Nanophase Composites

Jian Qiang Wang1)2) and Sie Chin Tjong1)
1) Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue
2) State Key Laboratory for Rapidly Solidified Nonequilibrium Alloys, Institute of Metal Research, Chinese Academy of Sciences

The microstructure evolution and grain growth behavior, of gas-atomized Al88Ni9Ce2Fe1 nanocomposite materials, were studied by means of the X-ray diffraction, transmission electron microscopy, and differential scanning calorimetry. The results showed that the microstructure of as-atomized powders are affected by the degree of solute supersaturation in matrix, the microstrain contained, the size, distribution and volume fraction of nanophase precipitated, and these are essentially sensitive to the powder particle sizes. Moreover, there appeared to be a two-stage phase transformation during thermal crystallization, i.e., the precipitation of α-Al and the growth of Al3(Ni, Fe) nanophase in preference to Al11Ce3 nanophase, respectively. Finally, the grain growth kinetics of α-Al at temperatures of 250 to 300°C, revealed that the volume-diffusion grain growth mechanism with an activation energy of 1.3 eV is controlling in the nanophase materials.

nanocomposite, rapid quenching, microstructure, grain growth

Received: March 21, 2001
Accepted: June 04, 2001 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals



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