Title

Interdiffusion in L1(2)-Ni3Al Alloyed with Re

Authors

Authors

N. Garimella; M. Ode; M. Ikeda; H. Murakami;Y. H. Sohn

Comments

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Abbreviated Journal Title

J. Phase Equilib. Diffus.

Keywords

high-temperature alloys; intermetallics; L1(2); Ni3Al; Re; ternary; interdiffusion; ZERO-FLUX PLANES; MULTICOMPONENT DIFFUSION COUPLES; MODIFIED ALUMINIDE; COATINGS; CRYSTAL SUPERALLOY TMS-82+; NI-AL SYSTEM; CONCENTRATION-DEPENDENCE; IRREVERSIBLE-PROCESSES; RECIPROCAL RELATIONS; OXIDATION BEHAVIOR; TERNARY ADDITIONS; Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy &; Metallurgical Engineering

Abstract

Ternary interdiffusion in L1(2)-Ni3Al with ternary alloying addition of Re was investigated at 1473 K using solid-to-solid diffusion couples. Interdiffusion flux of Ni, Al, and Re were directly calculated from experimental concentration profiles and integrated for the determination of average ternary interdiffusion coefficients. The magnitude of main interdiffusion coefficients <(<(D)over tilde>)over bar>(Al)((N) under bar(iN) under bar(i) under bar) and <(<(D)over tilde>)over bar>(Ni)((A) under bar(l) under bar(A) under bar(l) under bar) was determined to be much larger than that of the main interdiffusion coefficient <(<(D)over tilde>)over bar>(Al(orNi))(ReRe). A moderate tendency for Re to substitute for Al sites was reflected by its influence on interdiffusion of Al, quantified by large and positive <(<(D)over tilde>)over bar>(Ni)(AlRe) coefficients. Similar trends were observed from ternary interdiffusion coefficients determined by Boltzmann-Matano analysis. Profiles of concentrations and interdiffusion fluxes were also examined to estimate binary interdiffusion coefficients in Ni3Al, and tracer diffusion coefficients of Re (5.4x10(-16) +/- 2.33x10(-16) m(2)/s) in Ni3Al.

Journal Title

Journal of Phase Equilibria and Diffusion

Volume

30

Issue/Number

3

Publication Date

1-1-2009

Document Type

Article

Language

English

First Page

246

Last Page

253

WOS Identifier

WOS:000266453400006

ISSN

1547-7037

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