Partition of alloying elements between γ(L12), η (DO24), β (B2) and H(L21) phases in the Ni-Al-Ti base systems

R. Kainuma, Ikuo Ohnuma, K. Ishida

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12 Citations (Scopus)

Abstract

Partitioning behaviour of alloying elements (V, Nb, Ta, Cr, Mo, W, Hf, Zr, Mn, Fe, Co, Cu, Al, Si) between the γ' (L12:Ni3Al), η(DO24:Ni3Ti), β1(B2: NiAl), β2(B2: NiTi) and H(L21:Ni2AlTi) phases in the Ni-Al-Ti base systems at 1100°C has been studied mainly by the diffusion couple method. It is confirmed that (1) in the cases of equilibria between the phases H and β1 and H and β2, the elements with large atomic size such as Ta, Nb and Hf prefer to partition to the Ti-rich H phase and, (2) in the cases of equilibria between the H, γ' and η phases, the bcc elements such as Zr, V and Cr prefer to concentrate into the H phase rather than into the γ' or η phases, and (3) in the case of equilibrium between the γ and the η phases, the elements with a large atomic size such as Ta, Zr, W, Hf, Nb and Mo prefer to partition to the η phase rather than to the γ' phase. It is suggested that the size factor and the lattice stability of the component elements have a significant effect on the relative stability of these intermetallic phases. These data on the partition behaviour of alloying elements in the Ni-Al-Ti base system are likely to prove useful for alloy design involving Ni-base superalloys.

Original languageEnglish
Pages (from-to)978-985
Number of pages8
JournalJournal de Chimie Physique et de Physico-Chimie Biologique
Volume94
Issue number5
DOIs
Publication statusPublished - 1997 Jan 1

Keywords

  • Intermetallic compounds
  • Ni-Al-Ti base systems
  • Partition of alloying elements
  • Phase equilibria

ASJC Scopus subject areas

  • Biochemistry

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