TY - JOUR
T1 - Formation of γ′/β interface morphologies in Ni-A1-X ternary diffusion couples
AU - Kainuma, R.
AU - Ichinose, M.
AU - Ohnuma, I.
AU - Ishida, K.
N1 - Funding Information:
The authors wish to thank Dr L. Chandrasekaran of DERA, UK for help in critical reading and preparation of this manuscript for presentation. This work was supported by the grant-in-aids for Scientific Research from the Ministry of Education, Science, Sports and Culture, Japan.
PY - 2001/8/15
Y1 - 2001/8/15
N2 - The effect of alloying elements on the morphological stability of the interface between γ' (LI2,) and β (B2) phases in the Ni-Al-X system was investigated using the Ni-Al-X ternary diffusion couples annealed at temperatures ranging from 1173 to 1573 K. Planar interfaces were observed in the Ni-Al-X couples with X=Co, Cr, Cu, Fe, Mn, Si and V, while nonplanar interfaces with the Widmanstätten-like structure were formed in the couples with X = Mo, Nb, Ta, Ti and W. The roughness of the unstable interface was found to depend not only on the kind of alloying element, but also on the annealing time and temperature. Such a dependency of interface morphological stability on the alloying element X is related to the thermodynamic properties and the diffusivities of the element AI and the particular alloying element X.
AB - The effect of alloying elements on the morphological stability of the interface between γ' (LI2,) and β (B2) phases in the Ni-Al-X system was investigated using the Ni-Al-X ternary diffusion couples annealed at temperatures ranging from 1173 to 1573 K. Planar interfaces were observed in the Ni-Al-X couples with X=Co, Cr, Cu, Fe, Mn, Si and V, while nonplanar interfaces with the Widmanstätten-like structure were formed in the couples with X = Mo, Nb, Ta, Ti and W. The roughness of the unstable interface was found to depend not only on the kind of alloying element, but also on the annealing time and temperature. Such a dependency of interface morphological stability on the alloying element X is related to the thermodynamic properties and the diffusivities of the element AI and the particular alloying element X.
KW - Diffusion
KW - Morphological stability
KW - NiAl
KW - NiAl
KW - Phase equilibria
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U2 - 10.1016/S0921-5093(00)01873-6
DO - 10.1016/S0921-5093(00)01873-6
M3 - Article
AN - SCOPUS:0035882721
SN - 0921-5093
VL - 312
SP - 168
EP - 175
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
IS - 1-2
ER -