Microstructural characteristics and high temperature compressive properties at 1623K of a directionally solidified Nb-silisides based in-situ composite

Microstructure characterization of high temperature mechanisms in a Nb–Ti–Si alloy

“…Many efforts have been undertaken to improve the properties of these materials by alloying them with several elements (Cr, Hf, Y, Al, B…), notably to address the question of the resistance to oxidation, which remains problematic [9][10][11][12]; depending on the nature and content of these alloying elements, more intermetallic phases can appear, like NbCr2 and Nb5Si2B. Numerous works have concentrated on the mechanical properties of various Nb-silicides [1,9,10,13,14]. These studies showed that the Nb5Si3 phase exhibits a marked brittle behavior, whereas the Nbss matrix provides ductility and toughness to the material [1,13].…”

Effect of Zr and Mg on microstructure and fracture toughness of Nb-Si based alloys

“…For various purpose, Dy, Hf, Ti, Sn, Cr, Al, Mo, W, Ge, Ta, V, B, Fe and some other elements have been separately added in to Nb-Sibased composites [8][9][10][11][12][13][14][15], and it reported that the adding Zr and Mg at the same time can make significant impact to the microstructure of Nb-18Si binary alloy [16]. The effect of macro alloying element Zr and micro alloying element Mg on the microstructure, phases and fracture toughness at room temperature of Nb-Si based multiple alloy have been studied in this investigation.…”