Tailoring structure and properties of composites synthesized in situ using displacement reactions

Displacement reactions can produce in situ intermetallic and ceramic matrix composites in a process where an intermetallic or ceramic phase(s) and a potential reinforcing phase(s) are grown together during a reactive phase transformation. Various forms of interpenetrating-phase and dispersed-phase m...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 1995-06, Vol.195 (1-2), p.65-74
Main Authors: Henager, C.H., Brimhall, J.L., Brush, L.N.
Format: Article
Language:English
Subjects:
Applied sciences
Composites
Cross-disciplinary physics: materials science
rheology
Displacement
Exact sciences and technology
Materials science
Materials synthesis
materials processing
Metals. Metallurgy
Methods of materials synthesis and materials processing
Physics
Tailoring structure
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Summary:Displacement reactions can produce in situ intermetallic and ceramic matrix composites in a process where an intermetallic or ceramic phase(s) and a potential reinforcing phase(s) are grown together during a reactive phase transformation. Various forms of interpenetrating-phase and dispersed-phase microstructures are produced by means of these reactions. It is also apparent that both composition and morphology can be manipulated to some degree in order to tailor composite structures. The composition and morphology of MoSi 2 reinforced with SiC particles was explored over a wide range by controlling starting reactant compositions and hot-pressing conditions. Preliminary results of a model for the formation of the MoSi 2/SiC composite are presented in which both diffusion and interfacial reactions are included. Strength in bending and chevron-notch fracture toughness were determined as a function of temperature and composition and the measured properties are discussed with regard to the observed microstructures. A novel, graded composite structure in the NiAl/Ni 3Al/Ni:Al 2O 3 system is also discussed.
ISSN:0921-5093
1873-4936
DOI:10.1016/0921-5093(94)06506-3