Hostname: page-component-586b7cd67f-tf8b9 Total loading time: 0 Render date: 2024-11-29T09:18:28.820Z Has data issue: false hasContentIssue false
  • English
  • Français

Environmental Effects on the Room Temperature Ductility of Polysynthetically Twinned (PST) Crystals of Binary and Some Ternary TiAl Compounds

Published online by Cambridge University Press:  01 January 1992

M. H. Oh ,
H. Inui ,
M. Misaki ,
M. Kobayashi  and
M. Yamaguchi
M. H. Oh
Affiliation:
Department of Metal Science and Technology, Kyoto University, Sakyo-ku, Kyoto 606, Japan.
H. Inui
Affiliation:
Department of Metal Science and Technology, Kyoto University, Sakyo-ku, Kyoto 606, Japan.
M. Misaki
Affiliation:
Department of Metal Science and Technology, Kyoto University, Sakyo-ku, Kyoto 606, Japan.
M. Kobayashi
Affiliation:
Department of Metal Science and Technology, Kyoto University, Sakyo-ku, Kyoto 606, Japan.
M. Yamaguchi
Affiliation:
Department of Metal Science and Technology, Kyoto University, Sakyo-ku, Kyoto 606, Japan.
Get access

Abstract

Environmental effects on the room temperature ductility of polysynthetically twinned (PST) crystals of binary and some ternary TiAl compounds have been investigated through tensile tests conducted in four different atmospheres. The tensile ductility of TiAl PST crystals is sensitive to test environment. It is higher when tested in vacuum or in dry air than in air or in hydrogen gas. The environmental loss in ductility of PST crystals decreases with increasing strain rate. The environmental embrittlement of binary TiAl PST crystals can be interpreted in terms of hydrogen embrittlement. The ternary TiAl PST crystals containing Cr, Mo or Mn exhibit higher ductility than the binary TiAl PST crystals when tested in air, while the ternary ones show lower ductility than the binary ones in vacuum. Additions of alloying elements such as Cr, Mo and Mn seem to be effective in reducing the environmental loss in ductility of TiAl PST crystals.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 1001
Copyright
Copyright © Materials Research Society 1995

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] Kim, Y.W. and Dimiduk, D.W., JOM 43 (8), 40 (1991).Google Scholar
[2] Huang, S.C. and Shih, D.S. in Microstructure/Property Relationships in Titanium Aluminides and Alloys, edited by Kim, Y.W. and Boyer, R.R. (TMS, Warrendale, Pa, 1991) pp.105–122.Google Scholar
[3] Yamaguchi, M. and Inui, H. in Ordered Intermetallics-Physical Metallurgy and Mechanical Behavior, edited by Liu, C.T., Cahn, R.W. and Sauthoff, J.O. (Kluwer Academic Publishers, Dordrecht, 1992) pp. 217–235.Google Scholar
[4] for example, Liu, C.T. and McKamey, C.G. in High Temperature Aluminides and Intermetallics, edited by Whang, S.H., Liu, C.T., Pope, D.P. and Stiegler, J.O. (TMS, Warrendale, Pa, 1990) pp. 133–151.Google Scholar
[5] Liu, C.T. and Kim, Y.W., Scripta metall. mater. 27, 599 (1992).Google Scholar
[6] Takasugi, T., Hanada, S. and Yoshida, M., J. Mater. Res. 7, 2739 (1992).Google Scholar
[7] Kane, R.D. and Chakachery, E.A. in Environmental Effects on Advanced Materials, edited by Jones, R.H. and Ricker, R.E. (TMS, Warrendale, Pa, 1991) pp. 35–43.Google Scholar
[8] Meyn, D.A. in Microstructure/Property Relationships in Titanium Aluminides and Alloys, edited by Kim, Y.W. and Boyer, R.R. (TMS, Warrendale, Pa, 1991) pp. 275–281.Google Scholar
[9] Chu, W. Y. and Thomson, A. W., Scripta metall. mater. 25, 2133 (1991).Google Scholar
[10] Fujiwara, T., Nakamura, A., Hosomi, M., Nishitani, S.R., Shirai, Y. and Yamaguchi, M., Phil. Mag. A 61, 591 (1990).Google Scholar
[11] Inui, H., Nakamura, A., Oh, M.H. and Yamaguchi, M., Phil. Mag. A 66, 557 (1992).Google Scholar
[12] Inui, H., Oh, M.H., Nakamura, A. and Yamaguchi, M., Acta metall. mater. 40, 3095 (1992).Google Scholar
[13] Oh, M.H., Inui, H., Misaki, M. and Yamaguchi, M., Acta metall. mater., in press (1992).Google Scholar
[14] Chu, W.Y., Thomson, A.W. and Williams, J.C. in Hydrogen Effects on Material Behavior, edited by Moody, N.R. and Thomson, A.W. (TMS, Warrendale, Pa, 1990) pp. 543–554.Google Scholar
[15] Inui, H., Nakamura, A., Oh, M.H. and Yamaguchi, M., Ultramicroscopy 39, 298 (1991).Google Scholar
[16] Inui, H., Oh, M.H., Nakamura, A. and Yamaguchi, M., Phil. Mag. A 66, 539 (1992).Google Scholar
[17] Fu, C.L. and Yoo, M.H., Phil. Mag. Lett., 62, 159 (1990).Google Scholar
[18] Woodward, C., MacLaren, J.M. and Lao, S. in High-Temperature Ordered Intermetallic Alloys IV, edited by Johnson, L.A., Pope, D.E. and Stiegler, J.O. (Mater. Res. Soc. Proc. 213, Pittsburgh, Pa, 1991) pp. 715–720.Google Scholar
[19] Hug, G., Loiseau, A. and Veyssiere, P., Phil. Mag. A57, 499 (1988).Google Scholar
[20] Hazzledine, P.M., Kad, B.K., Fraser, H.L. and Dimiduk, D.M., presented at the 1992 MRS Spring Meeting, San Francisco, CA, 1992, in press.Google Scholar