Effect of Mo addition on the phase stability of β-Nb5Si3 phase

Study of the role of Hf, Mo and W additions in the microstructure of Nb–20Si silicide based alloys

“…This is consistent with Ref. [23] and Li et al [34], who have reported that Mo stabilises the bNb 5 Si 3 , but not with Chattopadhyay et al [35] who reported that the aNb 5 Si 3 was formed in the Nbe19Sie5Mo and Nbe13Sie4Mo alloys. Our data for the concentration of W in Nb 5 Si 3 is not in agreement with Ma et al [23] who reported that the average composition of bNb 5 Si 3 in the alloy Nbe16Sie10Moe15W was Nbe37Sie2.5Moe1.2W.…”

“…One in which no Si was detected by EPMA and another in which the Si concentration was in the range reported for the Nb ss in other silicide based alloys [4e15, 23,32,34,35]. This was also the case for the Nb ss in the alloy Nbe18Sie5Hfe3Tae2Mo [5].…”

Interdiffusion behavior between Nb and MoSi2 intermetallic compound

“…From Fig. 3, it can be seen thatD Si NbNb ,D Nb SiSi andD Nb MoMo are the main coefficients for Nb, Si and Mo in the Mo alloyed Nb 5 Si 3 phase in which Nb is partially replaced by the solution element Mo [30]. Fig.…”

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].…”