Hostname: page-component-848d4c4894-cjp7w Total loading time: 0 Render date: 2024-07-07T06:37:55.242Z Has data issue: false hasContentIssue false
  • English
  • Français

Mechanism of plastic deformation of Mn-added TiAl L 10 -type intermetallic compound

Published online by Cambridge University Press:  31 January 2011

T. Hanamura ,
R. Uemori  and
M. Tanino
T. Hanamura
Affiliation:
R & D Laboratories-I, Nippon Steel Corporation, 1618 Ida, Nakahara-ku, Kawasaki, 211 Japan
R. Uemori
Affiliation:
R & D Laboratories-I, Nippon Steel Corporation, 1618 Ida, Nakahara-ku, Kawasaki, 211 Japan
M. Tanino
Affiliation:
R & D Laboratories-I, Nippon Steel Corporation, 1618 Ida, Nakahara-ku, Kawasaki, 211 Japan
Get access

Abstract

Titanium aluminum intermetallic compound is a possible candidate for a high-temperature structural material, except for a problem of lack of room-temperature ductility. Recently, this problem was found to be overcome possibly by the addition of Mn, but this mechanism has not been fully understood yet. In order to understand the fundamental mechanism of the ductility improvement by Mn addition, microanalyses have been carried out. The results are as follows. Twin structures in a TiAl intermetallic compound in the as-cast state can be climinated by high-temperature annealing, while those in Mn-added TiAl are thermally more stable and exist even after annealing for 86.4 ks at 1273 K. The reason for this thermal stabilization of twin structures is considered to be due to the pinning effect of twin dislocations by Mn addition. The enhancement of twin deformation in TiAl by Mn addition is regarded to be caused by two factors. One is the stabilization of twin partial dislocations, becoming the nucleation sites for twin formation. The other is the decrease in stacking fault energy, which makes twin deformation energetically easier.

Type
Articles
Information
Journal of Materials Research , Volume 3 , Issue 4 , August 1988 , pp. 656 - 664
Copyright
Copyright © Materials Research Society 1988

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

1Lipsitt, H. A., Shechtman, D., and Schafrik, R. E., Metall. Trans. A 6, 1991 (1975).CrossRefGoogle Scholar
2Kawabata, T., Kanai, T., and Izumi, O., Acta Metall. 33 (7), 1355 (1985)CrossRefGoogle Scholar
3Kawabata, T. and Izumi, O., Scr. Metall. 21, 433 (1987).Google Scholar
Hug, G., Loiseau, A., and Lasalmonie, A., Philos. Mag. A 54, 47 (1986)CrossRefGoogle Scholar
Tsujimoto, T., in Conference of the Japan lnstitute of Metals, October 1987, Abstracts, p. 163.Google Scholar