Solid solution strengthening in Nb-Ta and Nb-Mo alloy single crystals

On the room temperature deformation mechanisms of a TiZrHfNbTa refractory high-entropy alloy

“…In our study, and taking into account the values of activation volumes, there is no clear evidence that the presence of five elements in equiatomic proportion strongly modify the thermally activated mechanisms. The athermal solid solution strengthening effect is especially highlighted in the yield stress unlike the plastic stage which is finally close to what is observed during the deformation of Ta-Nb solid solutions: activation volumes are not modified whatever the composition so much that the alloy behaving like a pure metal[45]. It should also be mentioned that in a recent publication on the plastic properties of a bcc single phase Ti 17.7 Zr 12.7 Hf 8.0 Nb 30.8 Ta 30.8 HEA, Feuerbacher et al found activation volumes between 0.5 and 2 nm 3 for T < 200°C[46].…”

Solid solution hardening of molybdenum–hafnium alloys: Experiments and Modeling

“…It was determined empirically by linear regression. As mentioned above the atomic size misfit parameter e b has a predominant influence on the solid solution hardening in this type of material [3,4,[22][23][24]. Therefore, the attempt is made to calculate the CRSS from Eq.…”

“…However, in body centered cubic (bcc) alloys, especially in refractory metal alloys, the CRSS show a strong dependence on the atomic misfit parameter e b [3,4,[22][23][24]. Mitchell and Raffo [22] presented a study based on solid solution hardening of tantalum alloys.…”

Solid-Solution Strengthening by Oxygen in Nb-Ta and Nb-Mo Single Crystals

“…There have been several reports on solid-solution strengthening of Nb by substitutional elements (see, e.g. [2][3][4][5][6][7][8][9]). Single crystal investigations below 400 K indicated that Nb is significantly strengthened by Mo, while not by Ta [2].…”

“…[2][3][4][5][6][7][8][9]). Single crystal investigations below 400 K indicated that Nb is significantly strengthened by Mo, while not by Ta [2]. Similar results have been obtained in polycrystals even at high temperatures [3][4][5][6][7][8][9].…”