Abstract
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.
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