Title
Microstructural Stability Of Fcc-Γ+B2-Β Coatings On Γ Substrate In Ni-Cr-Al System - A Phase Field Model Study
Abstract
A two-dimensional phase field model was employed to examine the evolution of interdiffusion microstructures in ternary Ni-Cr-Al solid-to-solid diffusion couples containing fcc-γ and γ + β (fcc + B2) alloys. Alloys of varying compositions and volume fractions of the second phase (β) were examined to simulate the dissolution kinetics of the β phase (i.e., recession of γ + β two-phase region) observed in γ vs. γ + β diffusion couples. Simulation results showed that the rate of recession of γ + β two-phase region was dependent on the composition of the single-phase γ alloy and the volume fraction of the β phase in the two-phase alloy of the couple. Specifically, the higher the Cr and Al content in the γ alloy and the higher the volume fraction of β in the γ + β alloy lower is the rate of dissolution. Although the volume fraction played a role, the concentration gradients of Al and Cr in the γ phase (e.g., between the matrix of γ + β alloy and single-phase γ alloy) also influenced the recession of the β phase. Simulated results were found to be in good agreement with the experimental observations in ternary Ni-Cr-Al solid-to-solid diffusion couples containing γ and γ + β alloys. © 2008 Elsevier B.V. All rights reserved.
Publication Date
12-25-2008
Publication Title
Surface and Coatings Technology
Volume
203
Issue
5-7
Number of Pages
407-412
Document Type
Article
Personal Identifier
scopus
DOI Link
https://doi.org/10.1016/j.surfcoat.2008.07.023
Copyright Status
Unknown
Socpus ID
55749088389 (Scopus)
Source API URL
https://api.elsevier.com/content/abstract/scopus_id/55749088389
STARS Citation
Mohanty, R. R. and Sohn, Y. H., "Microstructural Stability Of Fcc-Γ+B2-Β Coatings On Γ Substrate In Ni-Cr-Al System - A Phase Field Model Study" (2008). Scopus Export 2000s. 9311.
https://stars.library.ucf.edu/scopus2000/9311