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Estimation of Interdiffusivities of the Pseudo NiAl Binary Phase Formed in a Nickel-based Superalloy by Pack Cementation

Published online by Cambridge University Press:  03 March 2011

H. Wei*
Affiliation:
State Key Laboratory for Corrosion and Protection, Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
X.F. Sun
Affiliation:
State Key Laboratory for Corrosion and Protection, Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
Q. Zheng
Affiliation:
State Key Laboratory for Corrosion and Protection, Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
H.R. Guan
Affiliation:
State Key Laboratory for Corrosion and Protection, Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
Z.Q. Hu
Affiliation:
State Key Laboratory for Corrosion and Protection, Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
G.C. Hou
Affiliation:
State Key Laboratory for Corrosion and Protection, Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

The pseudo NiAl binary phase was formed in a nickel-based superalloy by pack cementation. Scanning electron microscopy, transmission electron microscopy, x-ray diffraction, electron probe microanalysis, and positron annihilation technique were used to characterize the pseudo NiAl binary phase. Based on reasonable assumptions, the chemical interdiffusivities of the pseudo NiAl binary phase were then assessed by means of the modified Wagner’s method. The results showed that the chemical interdiffusivities of the pseudo NiAl binary phase were about two orders of magnitude lower than those reported by others. The analysis indicated that the change in thermodynamic properties due to the additions of the microalloying atoms originally present in a superalloy could be responsible mainly for a decrease in chemical interdiffusivities.

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Copyright
Copyright © Materials Research Society 2005

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References

REFERENCES

1Lopez, G.A., Sommadossi, S., Gust, W. and Mittemeijer, E.J.: Phase characterization of diffusion soldered Ni/Al/NI interconnections. Interface Sci. 10, 13 (2002).CrossRefGoogle Scholar
2Shankar, S. and Seigle, L.L.: Interdiffusion and intrinsic diffusion in the NiAl (δ) phase of the Al–Ni system. Metall. Trans. 9A, 1467 (1978).CrossRefGoogle Scholar
3Robert, B. and Robert, A.R.: Pack cementation aluminide coatings on superalloys: Codeposition of Cr and reactive elements. J. Electrochem. Soc. 140, 1181 (1993).Google Scholar
4Xiong, L.Y.: Positron Annihilation Technique (Institute of Metal Research, Chinese Academy of Sciences, Shenyang,China, 1986).Google Scholar
5Kirkaldy, J.S. and Young, D.J.: Diffusion in the Condensed State (The Institute of Materials, London, U.K., 1987).Google Scholar
6Wagner, C.: The evaluation of data obtained with diffusion couples of binary single-phase and multiphase systems. Acta Mater. 17, 99 (1969).CrossRefGoogle Scholar
7Garg, S.P., Kale, G.B., Patil, R.V. and Kundu, T.: Thermodynamic interdiffusion coefficient in binary systems with intermediate phases. Intermetallics 7, 901 (1999).CrossRefGoogle Scholar
8Mehrer, H.: Diffusion in intermetallics. Mater. Trans JIM 37, 1259 (1996).CrossRefGoogle Scholar
9Darken, L.S.: Diffusion, mobility and their interrelation through free energy in binary metallic systems. Trans. AIME 175, 184 (1948).Google Scholar
10Hecht, U., Gránásy, L., Pusztai, T., Böttger, B., Apel, M., Witusiewicz, V., Ratke, L., DeWilde, J., Froyen, L., Camel, D., Drevel, B., Faivre, G., Fries, S.G., Legendre, B. and Rex, S.: Multiphase solidification in multicomponent alloys. Mater. Sci. Eng. 1, R46 (2004).Google Scholar
11Manning, J.R.: Diffusion and the Kirkendall shift in binary alloys. Acta Metall. 15, 817 (1967).CrossRefGoogle Scholar
12Ansara, I., Dupin, N., Leo, L.H. and Sundman, B.: Thermodynamic assessment of the Al–Ni system. J. Alloys Compd. 247, 20 (1977).CrossRefGoogle Scholar
13Sundman, B., Jansson, B. and Andersson, J.O.: The Thermo-Calc databank system. CALPHAD 9, 153 (1985).CrossRefGoogle Scholar
14Helander, T. and Ågren, J.: A phenomenological treatment of diffusion in Al-Fe and Al-Ni alloys having B2-B.C.C. ordered structure. Acta Mater. 27, 1141 (1999).CrossRefGoogle Scholar
15Wei, H., Sun, X.F., Zheng, Q., Guan, H.R. and Hu, Z.Q.: Estimation of interdiffusivity of the NiAl Phase in Ni–Al binary system. Acta Mater. 52, 2645 (2004).CrossRefGoogle Scholar
16Josef, T.: Thermodynamic activities of alloys. Thermochim. Acta. 314, 145 (1998).Google Scholar
17Kovalev, A.I., Barskaya, R.A. and Wainstein, D.L.: Effect of alloying on electronic structure, strength and ductility characteristics of nickel aluninide. Surf. Sci. 532–535, 35 (2003).CrossRefGoogle Scholar
18Song, Y., Guo, Z.Y., Yang, Y. and Li, D.: First principles study of site substitution of ternary elements in NiAl. Acta Mater. 49, 1647 (2001).CrossRefGoogle Scholar
19Börnsen, N., Bester, G., Meyer, B. and Fähnle, M.: Analysis of the electronic structure of intermetallic compounds, and application to structural defects in B2 phases. J. Alloys Compd. 308, 1 (2000).CrossRefGoogle Scholar
20Bin, B., Jiawen, F. and Collins, G.S. in Diffusion Mechanism in Crystalline Materials, edited by Mishin, Y., Cowan, N.E.B., Catlow, G.R.A., Farkas, D., and Vogl, G. (Mater. Res. Soc. Symp. Proc. Warrendale, PA, 1998), p. 527.Google Scholar
21Lin, W., Xu, J.H. and Freeman, A.J.: Cohesive properties, electronic structure, and bonding characteristics of RuAl—A comparison to NiAl. J. Mater. Res. 7, 592 (1992).CrossRefGoogle Scholar
22Dey, G.K.: Physical metallurgy of nickel aluminides. Sãdhanã. 28, 247 (2003).Google Scholar
23Chen, R.S., Guo, J.T., Zhou, W.L. and Xiong, L.Y.: A study of vacancy-like defects in the single-phase NiAl by positron annihiliation. Scripta Mater. 43, 789 (2000).CrossRefGoogle Scholar
24Hao, Y.L., Yang, Y., Hu, Q.M., Li, D., Song, Y. and Niinomi, M.: Bonding characteristics of micro-alloyed B2 NiAl in relation to site occupancies and phase stability. Acta Mater. 51, 5545 (2003).CrossRefGoogle Scholar