Effect of microstructure on the high-temperature deformation behavior of Nb–Si alloys

Vacancy induced brittle-to-ductile transition of Nb5Si3 alloy from first-principles

“…The material exhibits brittle behavior when B/G b 1.75, and vice versa, a material demonstrates ductile when B/G N 1.75. From Table 2, the calculated B/G ratio of Nb 5 Si 3 (1.54) is lower than 1.75, implying that it exhibits intrinsic brittle behavior, which is consistent with the experimental result [27][28][29]. It is clear that the calculated B/G ratio of Nb -va1 , Nb -va2 and Si -va2 is lower than 1.75, but the calculated B/G ratio is gradually close to 1.75.…”

Nb-Based Nb-Al-Fe Alloys: Solidification Behavior and High-Temperature Phase Equilibria

“…[1][2][3][4][5][6][7][8][9][10][11][12][13] The basic concept relies on obtaining a multiphase microstructure consisting of the Nb solid solution and a high-melting, strengthening intermetallic phase (or phases). The aluminides Nb 3 Al and Nb 2 Al have been reported as interesting candidates due to both high-temperature strength and the potential to form a protective alumina scale, but respective alloys with further additions of Ti, V, Cr, or Hf were found to suffer from microstructural instability or internal oxidation with precipitation of alumina.…”

Effects of Al addition on the microstructure and properties of Nb/Nb5Si3 in situ composites fabricated via spark plasma sintering

“…Alloying elements such as Ti, Cr, Al, Hf [8][9][10] , Mo [11][12][13] , Zr, Ta [14] and W [15] have been added to Nb-Si alloys at Si concentrations ranging from 12 at% to 22 at%. Nb/Nb 5 Si 3 composites have usually been fabricated from the Nb-Si system via vacuum arc-melting technology, yielding end products composed of primary Nbss and (Nb + Nb 3 Si) eutectic compositions.…”