Abstract
Interpenetrating-phase composites have certain advantages compared to discontinuous-phase composites. Among these are stability against microstructural coarsening and enhanced fracture resistance. However, it is difficult to fabricate IPCs in a controllable manner. Infiltration of porous performs, chemical vapor infiltration, directed metal oxidation, colloidal methods, and analogs to spinodal decomposition are all methods that have been used. Of particular interest are methods, such as the one presented here, that produce IPCs in situ without expensive lay-up processing. For the work presented here, synthesis of two composites, NiAl/Al[sub 2]O[sub 3] and NiAl+Ni[sub 3]Al+[gamma]-Ni/Al[sub 2]O[sub 3], exhibiting an interconnected cellular-phase structure by means of displacement reactions in situ is demonstrated.
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