Evidence for the formation and transformation of ordered oxlgen domains in Nb

Dislocation morphology in deformed and irradiated niobium

“…A survey of the literature published in the past decade revealed that, of the 16 inter actions proposed, only four (Hartley's reactions (2), (3) and (11) quoted in references (49), (50) and (51), respectively and one of Lindroo's (48)) have been confirmed and two others (Hartley's reactions (4) and (10) quoted in references (52) and (53), respectively) might have been established in con nection with the initiation of fine twins or cracks.…”

“…Interstitial impurities are known to exert pronounced effects on properties of bcc metals. Numer ous studies have been conducted on various bcc metals by a variety of methods (1)(2)(3)(4)(5)(6)(7)(8). For this reason, the effect of interstitial impurity was not included in the present study.…”

On the oxidation of niobium in “pure” hydrogen atmospheres

“…Suboxides form as precursors to stable oxides either in the early reaction times or at low 0 2 (or 11 2 0) partial pressures [ 7].…”

Dispersed barrier hardening in irradiated metals

“…But it is also known that in the bcc metals, the IIA tend to cluster (88) so whether the rapid hardening observed is an actual solution hardening or an ordering effect is difficult to ascertain. These ordered clusters are also observed with oxygen in niobium at concentrations [=200 wt ppm) well below their solubility limits (89) and in vanadium (90). They appear to be bet zones which would produce strain <XQ is too high by a factor of about 3 but the and could well be in the range of an .…”