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

Socpus ID

55749088389 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/55749088389

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