Hostname: page-component-8448b6f56d-c4f8m Total loading time: 0 Render date: 2024-04-19T06:40:38.076Z Has data issue: false hasContentIssue false
  • English
  • Français

Compression Deformation of Single-Crystal Pt3Al with the L12 Structure.

Published online by Cambridge University Press:  18 March 2013

Yoshihiko Hasegawa ,
Norihiko L. Okamoto  and
Haruyuki Inui
Yoshihiko Hasegawa
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
Norihiko L. Okamoto
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
Haruyuki Inui
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
Get access

Abstract

The plastic deformation behaviour of single crystals of Pt3Al with a chemical composition of Pt-27 at.%Al was investigated in compression from 77K to 1,273K. The L12 structure is not stable below around 220 K, transforming into either D0c, D0c’ or Pt3Ga structures. {001} slip system was operative for most loading axis orientations while {111} slip system was operative for a narrow orientation region close to [001]. The CRSS for {111} slip gradually decreases in the temperature range where the L12 structure is stable, followed by a sharp decrease above 1,073 K, without showing positive temperature dependence. On the other hand, the CRSS for {001} slip gradually decreases below 673 K and moderately increases above 673 K. Dislocations on {111} tend to align along their screw orientation, suggesting high Peierls stress for their motion, while those on {001} are edge-oriented and fairly curved on a local scale, suggesting relatively low Peierls stress. Dislocations on both {111} and {001} with a Burgers vector b = [$\bar 1$01] dissociate into two collinear superpartials with b = 1/2[$\bar 1$01] separated by an anti-phase boundary.

Keywords

dislocationstransmission electron microscopy (TEM)phase transformation
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1516: Symposium JJ – Intermetallic-Based Alloys―Science, Technology and Applications , 2013 , pp. 177 - 182
Copyright
Copyright © Materials Research Society 2013 

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

Westbrook, J. H., in Dislocations in Solids Vol. 10, edited by Nabarro, F. R. N. and Duesbery, M. S. (Elsevier, Amsterdam, 1996), p. 1.Google Scholar
Takasugi, T., Watanabe, S., Izumi, O. and Fat-Halla, N. K., Acta Metall. 37 (1989) p.3425.CrossRefGoogle Scholar
Takasugi, T., Hirakawa, S., Izumi, O., Watanabe, S., Acta metall. 35(1987) p.2015.CrossRefGoogle Scholar
Wee, D. M., Pope, D. P. and Vitek, V., Acta Metall. 32 (1984) p.829.10.1016/0001-6160(84)90019-1CrossRefGoogle Scholar
Heredia, F. E., Tichy, G., Pope, D. P. and Vitek, V., Acta metal. 37 (1989) p.2755.CrossRefGoogle Scholar
Vitek, V. and Paidar, V., in Dislocations in Solids Vol. 14, edited by Hirth, J. P. (Elsevier. Amsterdam, 2008), p. 441.Google Scholar
Gornostyrev, Y. N., Kontsevoi, Y., Freeman, A. J., Katsnelson, M. I., Trefilov, A.V. and Lichtensthtein, A.I., Phys. Rev. B 70 (2004) p.014102.CrossRefGoogle Scholar
Paxton, A. T., in Electron Theory in Alloy Design, edited by Pettifor, D. G. and Cottrell, A. H. (Institute of Materials, London, 1992), p. 158.Google Scholar
Chauke, H. R., Minisini, B., Drautz, R., Nguyen-Manh, D., Ngoepe, P.E. and Petiffor, D. G., Intermtallics 18 (2010) p.417.10.1016/j.intermet.2009.08.016CrossRefGoogle Scholar
Vitek, V., Pope, D. P. and Yamaguchi, M., Scripta Metall. 15 (1981) p.1029.Google Scholar
Yamaguchi, M., Paidar, V., Pope, D. P. and Vitek, V., Philos. Mag. A 45 (1982) p.867.CrossRefGoogle Scholar
Paidar, V., Yamaguchi, M., Pope, D. P. and Vitek, V., Philos. Mag. A 45 (1982) p.883.CrossRefGoogle Scholar