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Plastic deformation of single crystals with the C11b structure : Effect of the c/a axial ratio

Published online by Cambridge University Press:  21 March 2011

Kazuhiro Ito ,
Hironori Yoshioka  and
Masaharu Yamaguchi
Kazuhiro Ito
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606–8501, JAPAN.
Hironori Yoshioka
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606–8501, JAPAN.
Masaharu Yamaguchi
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606–8501, JAPAN.
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Abstract

MoSi2 has a great potential for very high temperature structural applications. Plastic deformation of MoSi2 single crystals with the C11b structure is extremely anisotropic. It is caused by non-Schmid behavior of slip on {013}<331> with the higher CRSS values for orientations closer to [001]. In order to provide better understanding of key factors on such non-Schmid behavior in MoSi2 (c/a=2.45), we chose PdZr2 with a c/a axial ratio higher than 3 (c/a=3.30) and characterized the plastic deformation. Compression tests were conducted at various temperatures along [001], [010] and [110] axes. Slip on {013}<100> has the shortest Burgers vector and the largest interplanar spacing in PdZr2 and was observed to be activated for [110] with the lowest CRSS. While slip on {013}<331> can be activated even at -196°C for [001]. Although {013}<331> slip has the same Schmid factors for [001] and [010], the yield stress of the [010]-oriented crystals is about twice higher than that of the [001]-oriented crystals. Thus non-Schmid behavior of slip on {013}<331> is also observed in PdZr2, and the manner is opposite to that in MoSi2. Plastic anisotropy in the C11b structure will be discussed in terms of the c/a axial ratio.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N4.6.1
Copyright
Copyright © Materials Research Society 2001

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References

REFERENCES

1. Vasudevan, A.K. and Petrovic, J.J., Mater. Sci. Eng. A, 155, 1 (1992).Google Scholar
2. Ito, K., Inui, H., Shirai, Y. and Yamaguchi, M., Phil. Mag. A, 72, 4, 1075 (1995).Google Scholar
3. Ito, K., Yano, T., Nakamoto, T., Inui, H. and Yamaguchi, M., Intermetallics, 4, S119 (1996).Google Scholar
4. Waghmare, U.V., Bulatov, V., Kaxiras, E. and Duesbery, M.S., Phil. Mag. A, 79, 3, 655 (1999).Google Scholar
5. Waghmare, U.V., Kaxiras, E., Bulatov, V. and Duesbery, M.S., Modelling Simul. Mater. Sci. Eng., 6, 493 (1998).Google Scholar
6. Mithchell, T.E., Baskes, M.I., Chen, S.P., Hirth, J.P. and Hoagland, R.G., Phil. Mag. A, in press.Google Scholar
7. Takeuchi, S., Furubayashi, E. and Taoka, T., Acta Met., 15, 1179 (1967).Google Scholar
8. Feller-Kniepmeier, M. and Hundt, M., Scr. Metall., 17, 905 (1983).Google Scholar
9. Nawaz, M.H.A. and Mordike, B.L., Phys. Stat. Sol. a, 32, 449 (1975).Google Scholar
10. Webb, G.L., Gibala, R. and Mitchell, T.E., Met. Trans., 5, 1581 (1974).Google Scholar
11. Heller, H. and Pearson, W.B., Z. Kristallogr., 168, 273 (1984).Google Scholar
12. Nevitt, M.V. and Koch, C.C., Intermetallic Compounds: vol. 1, Principles, ed. Westbrook, J.H. and Fleischer, R.L. (John Wiley & Sons, 1994) pp.385–401.Google Scholar
13. Maeland, A.J. and Libowitz, G.G., J.Less-Common Met., 74, 295 (1980).Google Scholar