Comparison of the М1(IV)–M2(IV)–{Fe,Co,Ni,Cu} phase diagrams (М–Ti, Zr, Hf)

DOI: 10.62564/M4-AS1327

Anastasiia Storchak, Marina Bulanova

Frantsevich Institute for Problems of Materials Science National Academy of Science of Ukraine


Phase relations in Zr-Ti-{Fe,Co,Ni,Cu}, Hf-Ti-{Fe,Co,Ni,Cu} and Hf-Zr-{Fe,Co,Ni,Cu} are discussed based on the results of our research [1, 2] and literature data. The common features and peculiarities of the systems are revealed. The main common feature is the formation of Laves phases. In the systems with Ni and Cu they base on ternary compounds, and in systems with Fe and Co these are binary-based phases. Based on generalizations made and crystallographic data, phase relations in unstudied Hf-Zr-{Co,Ni,Cu} systems are predicted. It is shown that the complexity of the topology of phase diagrams decreases in the following order: Zr-Ti-based > Hf-Ti-based > Hf-Zr-based. In each row, the most complex are Ni-containing systems. By “complexity” we mean the number of three-phase regions. It is shown that this correlates with the number of d-electrons, that is natural, since in transition metal systems it is d-electrons that define the thermodynamic stability of the phases.

Keywords
Ternary system, phase relations

Acknowledgments
Not provided

References
[1] A.M. Storchak, T.Y. Velikanova, L.V. Artyukh, A.V. Grytsiv, M.A. Turchanin, P.G. Agraval, V.M. Petuykh, Phase Equilibria and Phase Transformations at High Temperatures in Ternary Alloys of the Ni–Ti–Zr System at 50–100 Ni at.%, Powder Metall. Met. Ceram., 2019, V. 58, P. 210-221. [2] A. Storchak, V. Petuykh, V. Sobolev, I. Tikhonova, M. Bulanova, Phase Equilibria in the Zr-Ti-Cu System, JPED, 2023, V. 44, No. 5, P. 608-630.