Partition of alloying elements between [gamma] (A1), [gamma][prime] (L1[sub 2]), and [beta] (B2) phases in Ni-Al base systems

Journal Article · Tue Mar 01 04:00:00 EST 1994 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

OSTI ID:7284341

Jia, C C; Ishida, K; Nishizawa, T ^[1]

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1. Tohoku Univ., Sendai (Japan). Dept. of Materials Science

Phase equilibria between [gamma] (A1), [gamma][prime] (L1[sub 2]), and [beta] (B2) phases in the Ni-rich portions of the Ni-Al-X ternary systems were investigated over a temperature range of 800 C to 1300 C. The tie lines and phase boundaries were accurately determined by the diffusion couple technique. It was established that Co, Cu, Mn, Fe, and Cr concentrated more into the y phase than into the [gamma][prime] phase, while Ta, Nb, Ti, V, and Si mostly partitioned to the [gamma][prime] phase. The partition coefficients for alloying elements between [gamma] and [gamma][prime] phases varied as a function of temperature for most of the elements and also as a function of concentration for some of the elements, such as Mo, W, and V. In the equilibrium between [gamma][prime] and [beta] phases, Mn, Fe, Co, and Cu partitioned to the [beta] phase rather than to the [gamma][prime] phase, whereas Nb, Mo, Ta, Ti, W, V, Cu, and Si concentrated into the [gamma][prime] phase. The partition of alloying elements in the metastable equilibrium between [gamma] and [beta] phases, in the Ni-Al binary system, was estimated from the data on [gamma]/[gamma][prime] and [gamma][prime]/[beta] equilibria. Based on these data, the relative stabilizing effects of alloying elements on [gamma], [gamma][prime], and [beta] phases are also discussed.

• OSTI ID: 7284341
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 25:3; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOY SYSTEMS
ALLOYS
ALUMINIUM ALLOYS
CHROMIUM
COBALT
COPPER
ELEMENTS
IRON
MANGANESE
METALLURGICAL EFFECTS
METALS
MOLYBDENUM
NICKEL ALLOYS
NIOBIUM
PHASE STUDIES
SEMIMETALS
SILICON
TANTALUM
TERNARY ALLOY SYSTEMS
TITANIUM
TRANSITION ELEMENTS
TUNGSTEN
VANADIUM