Title

Site Preference And Diffusion In Ni3Al Alloyed With Ir, Ta Or Re At 1200°C

Keywords

Interdiffusion coefficients; L1 ordered structure 2; Ni3al intermetallic

Abstract

Diffusion in L12-Ni3Al with ternary alloying additions of Ir, Ta and Re was investigated at 1200°C using solid-to-solid diffusion couples, and examined with respect to site preference in ordered intermetallic compound. In addition to determination of average ternary interdiffusion coefficients [1-3], average effective interdiffusion coefficients were determined directly from the experimental concentration profiles. Ni has the largest magnitude of average effective interdiffusion coefficient, followed by Al, Ir, Re and Ta. The average effective interdiffusion coefficients for Ir, Re and Ta are much smaller than those for Ni and Al. Tracer diffusion coefficients determined by extrapolation technique, and available literature also followed the same trend. The relative tendency of Ni, Al, Ir, Re and Ta to occupy the α-Ni and β-Al sites are correlated to these diffusion coefficients, with due consideration for diffusion mechanisms and coordination of atoms. © (2010) Trans Tech Publications.

Publication Date

1-1-2010

Publication Title

Defect and Diffusion Forum

Volume

297-301

Number of Pages

1322-1327

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.4028/www.scientific.net/DDF.297-301.1322

Socpus ID

77952280599 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/77952280599

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