Microstructure and mechanical behavior of in-situ directional solidified NiAl/Cr(Mo) eutectic composite

NiAl-based composites reinforced with refractory metals in-situ by the directional solidification technique have been recognized as promising candidate materials for high temperature structural applications. An in-situ NiAl/Cr(Mo) eutectic composite has been successfully fabricated using an edge-def...

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Bibliographic Details
Published in:Acta materialia 1997, Vol.45 (1), p.295-308
Main Authors: Yang, J.-M., Jeng, S.M., Bain, K., Amato, R.A.
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Deformation, plasticity, and creep
Exact sciences and technology
Materials science
Metals. Metallurgy
Physics
Treatment of materials and its effects on microstructure and properties
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Summary:NiAl-based composites reinforced with refractory metals in-situ by the directional solidification technique have been recognized as promising candidate materials for high temperature structural applications. An in-situ NiAl/Cr(Mo) eutectic composite has been successfully fabricated using an edge-defined film-fed growth technique. The purpose of adding Mo into the NiAl/Cr eutectic system is to control the morphology of the Cr from a fibrous to a lamellar structure. Microstructure and chemical compositions were analysed using a scanning electron microscope with energy dispersive spectroscopy and a transmission electron microscope. The mechanical behavior of the composite, including fracture resistance and tensile properties at room and elevated temperatures, was studied. Damage evolution and fracture characteristics at room and elevated temperatures were also investigated.
ISSN:1359-6454
1873-2453
DOI:10.1016/S1359-6454(96)00124-3