The Ni−V (Nickel−Vanadium) system

Thermodynamic assessment of the Co–V and Co–V–C system

“…The main features of the Co-V system (see Fig. 3) show a qualitative similarity with the Ni-V system [12,13]. For both systems, there is a first-order congruent transformation near 25 at.% V from a high temperature terminal fcc solution phase to an ordered intermediate Co 3 M phase with a cubic AuCu 3 structure, a sigma phase with an extensive composition range in the central part of the system that is formed peritectically, an eutectic reaction between the sigma phase and the Co-rich or Ni-rich terminal solution fcc, and an intermediate CoM 3 phase with Cr 3 Si-type structure near 75 at.% V that forms by peritectoid reaction of the sigma phase and the V-rich terminal bcc solution phase.…”

“…All the binary intermediate phases; Co 3 M, CoM 3 , sigma, V 3 C 2 , V 2 C, and VC are adopted in the Co-V-C system in the present evaluation. In the Co-V system, the Co 3 M and CoM 3 phases are treated as stoichiometric compounds with a molar Gibbs energy given by: The sigma phase in the Co-V system is similar to the phase in the Ni-V [12,13] and Fe-V [23] systems, with a significant composition range. According to Andersson et al [24], the sigma phase can be modeled with three sublattices, one sublattiee with fcc-like co-ordination and two sublattices with bcc-like co-ordination, i.e.…”

Alloying effect on stability of multi-variant structure of Ni3V at elevated temperatures

“…First, development of wrought alloys with high volume fraction of the compound is possible, because Ni 3 V belongs to Kurnakov type compound with a D0 22 $ A1(fcc) ordering/disordering temperature, T c ; at 1318 K in the stoichiometric composition [1]. Secondly, control of the coherent morphology of the D0 22 phase in the A1 matrix is highly possible, because the lattice parameter, a and c; of Ni 3 V is respectively smaller and larger than that of A1 phase ða D022 , a A1 , c D022 =2Þ [2 -3], unlike the same type of metastable compound Ni 3 Nb-g 00 ða A1 , a D022 , c D022 =2Þ; which only shows disc shape [4].…”

Phase Equilibria of the Sn–Ni–V System: The 980°C Isothermal Section and the Sn-Rich Corner at 600°C and 300°C

“…The Ni-V phase diagram is well described for the whole range of composition in several key publications. [33][34][35] It is characterized by a large FCC phase field which extends almost half-way across the diagram. There is also appreciable dissolution of Ni in a-V, up to a maximum of 24 at.% Ni at 1280°C.…”