Hostname: page-component-cd9895bd7-p9bg8 Total loading time: 0 Render date: 2024-12-30T22:55:51.579Z Has data issue: false hasContentIssue false
  • English
  • Français

Microstructure and Phase Stability Studies on Heusler Phase Ni2AlHf and G-phase Ni16Hf6Si7 in Directionally Solidified NiAl–Cr(Mo) Eutectic Alloyed with Hf

Published online by Cambridge University Press:  31 January 2011

Y. X. Chen ,
C. Y. Cui ,
Z. Q. Liu ,
L. L. He ,
J. T. Guo  and
D. X. Li
Y. X. Chen
Affiliation:
Laboratory of Atomic Imaging of Solids, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, People's Republic of China
C. Y. Cui
Affiliation:
Laboratory of Atomic Imaging of Solids, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, People's Republic of China
Z. Q. Liu
Affiliation:
Laboratory of Atomic Imaging of Solids, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, People's Republic of China, and Institute of Materials and Technology, Dalian Maritime University, Dalian 116026, People's Republic of China
L. L. He
Affiliation:
Laboratory of Atomic Imaging of Solids, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, People's Republic of China
J. T. Guo
Affiliation:
Laboratory of Atomic Imaging of Solids, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, People's Republic of China
D. X. Li
Affiliation:
Laboratory of Atomic Imaging of Solids, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, People's Republic of China
Get access

Abstract

Small additions of Hf to directionally solidified NiAl–Cr(Mo) eutectic resulted in precipitation of a high density of Heusler phase Ni2AlHf along with fine G-phase Ni16Hf6Si7. The Heusler phase was mainly located on the grain boundary region. The fine G-phase formed in the presence of Si, which was a contamination resulting from contact with ceramic shell molds during directional solidification of the alloy. These fine G-phases were cuboidal in shape and coherent with the NiAl matrix. After hot isostatic pressing and aging treatment, the fine G-phases completely disappeared. The density of the Heusler phase was partially reduced, and the Heusler particles precipitated preferentially on the NiAl/Cr(Mo) interfaces and grain boundaries of the NiAl matrix. Some Heusler particles precipitated locally within the NiAl matrix, and small amounts of them precipitated within the Cr(Mo) phase. The structures of the NiAl/Ni2AlHf and NiAl/Ni16Hf6Si7 interfaces were investigated by high-resolution electron microscopy. The habit plane of the fine G-phase was {001}NiAl. This result was in good agreement with calculation based on the linear elastic theory. The misfit dislocation network on the NiAl/Ni2AlHf (110) interface was calculated from the O-lattice model and compared with the observation, which showed good agreement.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 6 , June 2000 , pp. 1261 - 1270
Copyright
Copyright © Materials Research Society 2000

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1.Cline, H.E. and Walter, J.L., Metall. Trans. 1, 2907 (1970).CrossRefGoogle Scholar
2.Cline, H.E., Walter, J.L., Lifshin, E., and Russell, R.R., Metall. Trans. 2, 189 (1971).CrossRefGoogle Scholar
3.Yang, J.M., Jeng, S.M., Bain, K., and Amato, R.A., Acta Metall. Mater. 45, 295 (1997).CrossRefGoogle Scholar
4.Darolia, R., JOM 43, 44 (1991).CrossRefGoogle Scholar
5.Strutt, P.R., Polvani, R.S., and Ingram, J.C., Metall. Trans. 7A, 23 (1976).CrossRefGoogle Scholar
6.Polvani, R.S., Tzeng, W-S., and Srrutt, P.R., Metall. Trans. 7A, 33 (1976).Google Scholar
7.Strutt, P.R. and Kear, B.H., in High Temperature Ordered Intermetallic Alloys, edited by Koch, C.C., Liu, C.T., and Stoloff, N.S. (Mater. Res. Soc. Symp. Proc. 39, Pittsburgh, PA, 1985), p. 279.Google Scholar
8.Yamaguchi, M., Umakoshi, Y., and Yamane, T., Philos. Mag. A 50, 205 (1984).CrossRefGoogle Scholar
9.Umakoshi, Y., Yamaguchi, M., and Yamane, T., Philos. Mag. A 52, 357 (1985).CrossRefGoogle Scholar
10.Whittenberger, J.S., Viswanadham, R.K., Mannan, S.K., and Kumar, K.S., in High Temperature Ordered Intermetallic Alloys III, edited by Liu, C.T., Taub, A.I., Stoloff, N.S., and Koch, C.C. (Mater. Res. Soc. Symp. Proc. 133, Pittsburgh, PA, 1989), p. 621.Google Scholar
11.Takeyama, M. and Liu, C.T., J. Mater. Res. 5, 1189 (1990).CrossRefGoogle Scholar
12.Locci, I.E., Dickerson, R.M., Garg, A., Noebe, R.D., Whittenberger, J.D., Nathal, M.V., and Darolia, R., J. Mater. Res. 11, 3024 (1996).Google Scholar
13.Locci, I.E., Noebe, R.D., Bowman, R.R., Miner, R.V., Nathal, M.V., and Darolia, R., in High Temperature Ordered Intermetallic Alloys IV, edited by Johnson, L.A., Pope, D.P., and Stiegler, J.D. (Mater. Res. Soc. Symp. Proc. 213, Pittsburgh, PA, 1991), p. 1013.Google Scholar
14.Khachaturyan, A.G., Theory of Structural Transformation in Solids (John Wiley & Sons, New York, 1983), Chaps. 7–12.Google Scholar
15.Wen, S.H., Kostlan, E., Hong, M., Khachaturyan, A.G., and Morris, J.W. Jr, Acta Metall. Mater. 29, 1247 (1981).CrossRefGoogle Scholar
16.Wasilewski, R.J., Trans. TMS-AIME 236, 455 (1966).Google Scholar
17.Bollmann, W., Crystal Defects and Crystalline Interfaces (Springer, New York, 1970).CrossRefGoogle Scholar
18.Lu, P. and Cosandey, F., Acta Metall. Mater. 40, S259 (1992).CrossRefGoogle Scholar
19.Li, D.X., Pirouz, P., Heuer, A.H., Yadavalli, S., and Flynn, C.P., Acta Metall. Mater. 40, S237 (1992).CrossRefGoogle Scholar
20.Shieu, F.S. and Sass, S.L., Acta Metall. Mater. 38, 1653 (1990).CrossRefGoogle Scholar
21.Mader, W. and Ruhle, M., Acta Metall. Mater. 37, 853 (1989).CrossRefGoogle Scholar
22.Friedel, J., Dislocations (Addison, Reading, MA, 1964), p. 185.Google Scholar
23.Johnson, D.R., Chen, X.F., Oliver, B.F., Noebe, R.D., and Whittenberger, J.D., Intermetallics 3, 99 (1995).CrossRefGoogle Scholar
24.Friedel, J., Trans. TMS-AIME 236, 221 (1966).Google Scholar
25.Garg, A. and Noebe, R.D., Scr. Metall. 39, 437 (1998).CrossRefGoogle Scholar