Interdiffusion in Ni-Rich, Ni-Cr-Al alloys at 1100 and 1200 °C: Part I. Diffusion paths and microstructures
Document Type
Article
Publication Date
1-12-1987
Department
Department of Materials Science and Engineering
Abstract
Interdiffusion in Ni-rich, Ni-Cr-Al diffusion couples was studied after annealing at 1100 and 1200 °C. Recession of γ′ (Ni 3Al structure), β (NiAl structure), or α (bcc) phases was also measured. Aluminum and chromium concentration profiles were measured in the γ (fcc) phase for most of the diffusion couples. The amount and location of Kirkendall porosity suggests that Al diffuses more rapidly than Cr which diffuses more rapidly than Ni in the γ phase of Ni-Cr-Al alloys. The location of maxima and minima in the concentration profiles of several of the diffusion couples indicates that both cross-term diffusion coefficients for Cr and Al are positive and that D CrAl has a greater effect on the diffusion of Cr than does D A1Cr on the diffusion of Al. The γ/γ + β phase boundary has also been determined for 1200 °C through the use of numerous γ/γ+ β diffusion couples.
Publication Title
Metallurgical Transactions A
Recommended Citation
Nesbitt, J.,
&
Heckel, R.
(1987).
Interdiffusion in Ni-Rich, Ni-Cr-Al alloys at 1100 and 1200 °C: Part I. Diffusion paths and microstructures.
Metallurgical Transactions A,
18(12), 2061-2073.
http://doi.org/10.1007/BF02647078
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/4412
Publisher's Statement
© 1987 The Metallurgical of Society of AIME. Publisher’s version of record: https://doi.org/10.1007/BF02647078