TY - JOUR
T1 - Estimation of γ/γ′ interfacial energy in Ni-Co base superalloy TMW-4M3
AU - Hara, Takaaki
AU - Kobayashi, Shinichi
AU - Ueno, Tomonori
AU - Oikawa, Katsunari
N1 - Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2019/1/15
Y1 - 2019/1/15
N2 - The interfacial energy between the γ and γ′ phase 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 γ′ precipitates 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 75 mJ/m2 between 1373 and 1413 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 76.3 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 γ′, and the γ/γ′ interfacial energy estimation using the EBM is a suitable method for TMW-4M3.
AB - The interfacial energy between the γ and γ′ phase 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 γ′ precipitates 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 75 mJ/m2 between 1373 and 1413 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 76.3 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 γ′, and the γ/γ′ interfacial energy estimation using the EBM is a suitable method for TMW-4M3.
KW - A1. Characterization
KW - A1. Diffusion
KW - A2. Growth from high temperature solutions
KW - B1. Alloys
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U2 - 10.1016/j.jcrysgro.2018.10.014
DO - 10.1016/j.jcrysgro.2018.10.014
M3 - Article
AN - SCOPUS:85054709539
SN - 0022-0248
VL - 506
SP - 91
EP - 96
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
ER -