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The Nb/Nb 5 Si 3  based composites were fabricated by conventional casting (CC) and directional solidification (DS) methods. Micro structural characteristics, compressive properties and fracture toughness of the CC and DS composites were investigated by SEM, XRD, TEM, bending and compression tests. The results demonstrate that in the CC Nb/Nb 5 Si 3  based composite, the intergrowth of fine (Nb,Ti)ss and α-(Nb,Ti) 5 Si 3  phases leads to the formation of eutectic structure and the coarse α-(Nb,Ti) 5 Si 3  dendritic phase prefers to grow along eutectic cell boundary. The (Nb,Ti) 3 Si, (Ti,Nb) 5 Si 3  and Dy 2 O 3  phases mainly segregate along the eutectic cell boundary and moreover there is an orientation relationship between the (Nb,Ti) 3 Si and (Nb,Ti)ss phases: [001]  (Nb,Ti)3Si //[112] (Nb,Ti)ss  and (110) (Nb,Ti)3Si //(110) (Nb,Ti)ss . The DS processing promotes the formation of coarse primary α-(Nb,Ti) 5 Si 3  phase, (Ti,Nb) 5 Si 3 /(Nb,Ti)ss eutectic and α-(Nb,Ti) 5 Si 3 /(Nb,Ti)ss eutectic in the DS Nb/Nb 5 Si 3  based composite. Moreover, the (Nb,Ti)ss and α-(Nb,Ti) 5 Si 3  phases are aligned paralleling to the DS direction and exhibits strong crystal orientation preference. In addition, an orientation relationship between the (Nb,Ti) ss and α-(Nb,Ti) 5 Si 3  phases is observed: [310] α(Nb,Ti)5Si3 //[110] (Nb,Ti)ss . Compared with the CC Nb/Nb 5 Si 3  based composite, the DS Nb/Nb 5 Si 3  based composite possesses the higher yield strength and fracture toughness, which should be ascribed to the microstructure optimization.

advanced composites letters

Microstructural Characteristics and Mechanical Properties of a Nb/Nb<sub>5</sub>Si<sub>3</sub> based Composite with and without Directional Solidification

Microstructural Characteristics and Mechanical Properties of a Nb/Nb5Si3 based Composite with and without Directional Solidification

Microstructural Characteristics and Mechanical Properties of a Nb/Nb₅Si₃ based Composite with and without Directional Solidification