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Correlation between energy transfers and solid state reactions induced by mechanical alloying on the Mo33Si66 system

Published online by Cambridge University Press:  31 January 2011

L. Liu  and
M. Magini
L. Liu
Affiliation:
ENEA-INN-NUMA, CRE-CASACCIA, Via Anguillarese 301, Rome, Italy
M. Magini
Affiliation:
ENEA-INN-NUMA, CRE-CASACCIA, Via Anguillarese 301, Rome, Italy
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Abstract

Phase transformations of the Mo33Si66 powder mixture under different milling conditions have been systematically investigated by x-ray diffraction, and scanning and transmission electron microscopy. The effect of the milling conditions on the Mo/Si solid state reactions (SSR) has been examined in detail. The energy transfer from the milling tools to the powder under processing has been quantified by an already assessed collision model. It has been found that the higher energetic input favors the formation of the room temperature stable phase αMoSi2, while the lower energetic input promotes the formation of the metastable phase βMoSi2. In addition, if the energy transfer is high enough, the Mo/Si reaction proceeds in a form of self-propagating high temperature synthesis (SHS). Thermodynamics and kinetics aspects related to the different SSR's are discussed.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 9 , September 1997 , pp. 2281 - 2287
Copyright
Copyright © Materials Research Society 1997

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