Phase stability of the X2AlTi (X: Fe, Co, Ni and Cu) Heusler and B2-type intermetallic compounds

K. Ishikawa, R. Kainuma, I. Ohnuma, K. Aoki, K. Ishida

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45 Citations (Scopus)

Abstract

Ordering and phase separation between the B2 and L21 phases in the X2AlTi (X: Fe, Co, Ni, Cu) intermetallic compounds were investigated. The B2/L21 continuous ordering was determined using the diffusion couple technique in the temperature range of 1273-1573 K. It was found that the substitution of Co for Fe results in raising the B2/L21 ordering temperature and that of Cu for Ni brings about widening of the B2+L21 two-phase region on both the NiAl and NiTi sides. It is shown that the maximum temperatures of B2/L21 order-disorder transition (TcmaxB2/L2(1)), the tricritical temperatures (TtB2/L2(1)) and the phase boundaries of the miscibility gap between the B2 and L21 phases in the XAl-XTi pseudobinary systems can be well described by the 3d+4s electron concentration of the elements occupying the X site. On the basis of this finding, the phase stability and the interchange energies between Al and Ti in the next nearest neighbors of X-Al-Ti (X: Ti, V, Cr, Mn, Fe, Co, Ni and Cu) system are discussed.

Original languageEnglish
Pages (from-to)2233-2243
Number of pages11
JournalActa Materialia
Volume50
Issue number9
DOIs
Publication statusPublished - 2002 May 24

Keywords

  • Intermetallic compounds
  • Ordering
  • Phase equilibria
  • Thermodynamics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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