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Investigations on NiAl composites fabricated by matrix coated single crystalline Al2O3-fibers with and without hBN interlayer
Authors:Weiping Hu  Hao Chen  Yunlong Zhong  Jia Song and Günter Gottstein
Affiliation:(1) Institute of Physical Metallurgy and Metal Physics, RWTH Aachen University, Aachen, Germany;(2) Present address: Federal-Mogul Friction Products GmbH, Technik-Zentrum Bad Camberg, D-65220 Bad Camberg, Germany;(3) Present address: Institute for Materials Research II, Karlsruhe Research Center, D-76344 Eggenstein-Leopoldshafen, Germany
Abstract:The intermetallic compound NiAl has excellent potential for high temperature structural applications but suffers from low temperature brittleness and insufficient high temperature strength. One way to remove these deficiencies is the reinforcement by high strength ceramic fibers. Such intermetallic matrix composites can be conveniently fabricated by the hot pressing of matrix coated fibers. Al2O3 single crystal fibers show excellent chemical stability with the NiAl matrix, but the residual thermal compressive stresses during cool down dramatically degrades the fiber strength and thus, renders the composite useless for structural applications. We report on an experimental and computational study to mitigate this problem and to fabricate Al2O3/NiAl composites with sufficient high temperature strength. Analytical TEM, mechanical testing and push-out tests were employed to characterize chemistry, microstructure and mechanical properties of the composites. It will be shown that a processing window exists that allows producing intermetallic matrix composites with promising mechanical properties.
Keywords:NiAl composite  interface structure  mechanical property  Al2O3 fiber
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