Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
12018897 | Journal of Crystal Growth | 2019 | 21 Pages |
Abstract
The interfacial energy between the γ and γⲠphase in Ni-Co base superalloy TMW-4M3 was investigated using both a kinetic analysis of experimental data and a thermodynamic analysis. The coarsening rate of γⲠprecipitates during the aging treatment process was analyzed using extended Lifshitz-Slyozov-Wagner theory, including the contribution of a full diffusion matrix with a thermodynamic calculation. The interfacial energies calculated from the coarsening kinetics using only the diagonal components were half as large as those using the off-diagonal contributions as well. The interfacial energy with full diffusion matrix contributions is about 75â¯mJ/m2 between 1373 and 1413â¯K. In addition, the interfacial energy was also analyzed on the basis of the extended Becker's model (EBM), and the results, which ranged from 73.9 to 76.3â¯mJ/m2, showed good agreements with those from the coarsening kinetics. A comparison of the interfacial energy between TMW-4M3 and several Ni base superalloys indicated an identical tendency of higher interfacial energy with a larger Ti/Al ratio. The off-diagonal terms of a diffusion matrix are very important in analyzing the coarsening kinetics of γâ², and the γ/γⲠinterfacial energy estimation using the EBM is a suitable method for TMW-4M3.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Takaaki Hara, Shinichi Kobayashi, Tomonori Ueno, Katsunari Oikawa,