Microstructure and mechanical properties of Nb/Nb5Si3 in situ composites in Nb–Mo–Si and Nb–W–Si systems

Study of the role of Mo and Ta additions in the microstructure of Nb–18Si–5Hf silicide based alloy

“…Furthermore, the level of Mo addition in Nbe18Si was reported to affect the true stressestrain curves in compression of directionally solidified and arc-melted Nbe18SiexMo (x ¼ 5, 15) alloys deformed at an initial strain rate of 3 Â 10 À4 s À1 at 1773 K with different type of 5-3 silicides (i.e., a or b Nb 5 Si 3 ) in their microstructure [11]. Addition of 5 at.% Mo in Nbe16Si significantly improved the ductility at room temperature [12]. To the authors' knowledge, there is no data on the effect of Ta additions on the mechanical properties of NbeSi alloys.…”

Experimental study on the as-cast solidification of the Si-rich alloys of the Nb–Si–Mo ternary system

“…The addition of Mo element in the Nb-Si based alloys can inhibit the eutectic reaction leading to the formation of (Nb)ss (Nb-based solid solution) and Nb 3 Si phases and obtain a wide range of two-phase region (Nb)ss þ bNb(Mo) 5 Si 3 . The in-situ composite with the fine two-phase microstructure and the strong solid solution-hardening effect of Mo on those appropriate phases can strengthen the composite and improve its melting point as well [5][6][7][8].…”

Investigation on the as-cast microstructure of Nb–Nb silicide based multicomponent alloys

“…Appropriate amount of addition of B has a potential to improve room-temperature toughness and high-temperature strength simultaneously [12]. The Mo addition to the Nb-Si alloys has been reported to limit the eutectic reaction L / (Nb) þ Nb 3 Si and promote the formation of (Nb) þ b-Nb 5 Si 3 eutectic microstructure [13], which is suggested to be desirable for the production of in situ reinforced refractory intermetallic composites via a liquid-solid process.…”