Investigations on NiAl composites fabricated
by matrix coated single crystalline AlO-fibers with and without hBN interlayer

doi:10.1007/s11706-008-0031-7

2008, Vol. 2

Issue (2) : 182-193 https://doi.org/10.1007/s11706-008-0031-7

Investigations on NiAl composites fabricated by matrix coated single crystalline AlO-fibers with and without hBN interlayer

HU Weiping, CHEN Hao, ZHONG Yunlong, SONG Jia, GOTTSTEIN Günter

Institute of Physical Metallurgy and Metal Physics, RWTH Aachen University, ;

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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.

Issue Date: 05 June 2008

Cite this article:

CHEN Hao,HU Weiping,ZHONG Yunlong, et al. Investigations on NiAl composites fabricated by matrix coated single crystalline AlO-fibers with and without hBN interlayer[J]. Front. Mater. Sci., 2008, 2(2): 182-193.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-008-0031-7
https://academic.hep.com.cn/foms/EN/Y2008/V2/I2/182

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