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Evidence for self-sustained MoSi2 formation during room-temperature high-energy ball milling of elemental powders

Published online by Cambridge University Press:  31 January 2011

E. Ma ,
J. Pagán ,
G. Cranford  and
M. Atzmon
E. Ma
Affiliation:
Department of Nuclear Engineering, University of Michigan, Ann Arbor, Michigan 48109-2104
J. Pagán
Affiliation:
Department of Nuclear Engineering, University of Michigan, Ann Arbor, Michigan 48109-2104
G. Cranford
Affiliation:
Department of Nuclear Engineering, University of Michigan, Ann Arbor, Michigan 48109-2104
M. Atzmon
Affiliation:
Department of Nuclear Engineering, University of Michigan, Ann Arbor, Michigan 48109-2104
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Abstract

We present evidence indicating that rapid, self-sustained, high-temperature reactions play an important role in the formation of tetragonal MoSi2 during room-temperature high-energy ball milling of elemental powders. Such reactions appear to be ignited by mechanical impact in an intimate, fine-grained, Mo–Si physical mixture formed after an initial milling period. Under certain conditions, limited propagation of self-sustained reactions in these uncompacted powder mixtures renders the compound formation seemingly gradual in bulk-averaged analysis. It is suggested that this type of reaction is an important mechanism in the mechanical alloying of highly exothermic systems. Results are discussed in comparison with similar reactions we observed in ball-milled Al–Ni powders, with self-sustained combustion synthesis previously reported for Mo–Si powders, and with interfacial diffusional reactions in Mo–Si powders or thin-film diffusion couples.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 8 , August 1993 , pp. 1836 - 1844
Copyright
Copyright © Materials Research Society 1993

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