Hostname: page-component-586b7cd67f-r5fsc Total loading time: 0 Render date: 2024-11-25T19:46:33.616Z Has data issue: false hasContentIssue false
  • English
  • Français

Tem and Computer Image Simulation Studies on the Dissociation of Superdislocations in Ll2 Al3Ti Alloy

Published online by Cambridge University Press:  22 February 2011

Yonghua Rong ,
Xiaohua Wu ,
Xiaofu Chen ,
Shipu Chen  and
Gengxiang Hu
Yonghua Rong
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, China
Xiaohua Wu
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, China
Xiaofu Chen
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, China
Shipu Chen
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, China
Gengxiang Hu
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, China
Get access

Abstract

TEM investigation associated with computer image simulations were conducted to determine the dislocation core structure in the Ll2 Al67MnsTi25 alloy deformed at room temperature. It is identified that the a<110> superdislocations dissociated into pairs of a/3<112> superpartials with SISF between them. The theoretical and experimental micrographs are in good agreement under various diffraction conditions. The unusual temperature dependence of flow stress at low temperature can be related to the SISF-type dissociation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 1221
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

1. Kumar, K.S. and ABrown, S., Phil. Mag. A 65, 91 (1992)Google Scholar
2. Chen, Xiaofu, Wu, Xiaohua, Chen, Shipu and Hu, Gengxiang, Scnpta Metall et Mater 26,1775 (1992)Google Scholar
3. Zhang, S., Nic, J.P., Milligan, W.W. and Mikkola, D.E., Scnpta Metall 24, 1441(1990)Google Scholar
4. Wu, Z.L., Pope, D.P. and Vitek, V. in High-Temperature Ordered Intermetallic Alloys, edited by Johnson, L., Pope, D.P. and Stiegler, J.O. (Mater.Res. Soc. Symp. Proc. 213, Pittsburgh, PA, 1991) pp.487 Google Scholar
5. Wu, Xiaohua, Chen, Shipu, Rong, Yonghua, Chen, Xiaofu and Hu, Gengxiang in High-Temperature Ordered Intermetallic Alloys, edited by Baker, I., Darolia, R. Whittenberger, J.D. and Yoo, M.H. (Mater.Res. Soc. Symp. Proc. 288, Pittsburgh, PA, 1993) pp.605 Google Scholar
6. Tuner, C.D., Powers, W.O. and Wert, J.A., Acta Metall 37, 2635 (1989)Google Scholar
7. Lerf, R. and Morns, D.G., Acta Metall 39, 2419(1991)Google Scholar
8. George, E.P., AHorton, J., Porters, W.D. and Schneibel, J.H., J. Mater Res. 5, 1639 (1990)Google Scholar
9. Inoue, H.R.P., Cooper, C.V., Favrow, L. H., Hanada, Y. and Wayman, C.M. in High-Temperature Ordered Intermetallic Alloys, edited by Johnson, L., Pope, D.P. and Stiegler, J.O. (Mater Res. Soc. Symp. Proc. 213, Pittsburgh, PA 1991) pp.493 Google Scholar
10. Morris, D.G., J.Mater. Res. 7, 303 (1992)Google Scholar
11. Gengxiang, Hu, Shipu, Chen, Xiaohua, Wu and Xiaofu, Chen, J. Mater. Res. 6, 957 (1991)Google Scholar
12. Wu, Xiaohua, Rong, Yonghua, Chen, Shipu and Hu, Gengxiang, Scnpta Metall. Mater. 28, 1519 (1993)Google Scholar
13. Inui, H., Luzzi, D.E., Porters, W.D., Pope, D.P., Vitek, V. and Yamaguchi, M.. Phil Mag. A 65, 1245 (1992)Google Scholar
14. Zhang, S., Milligan, W.W. and Mikkola, D.E.. J.Mater.Res. 9, 553 (1994)Google Scholar
15. Veyssiere, P. and Morris., D.G. Phil. Mag. A 67, 491(1993)Google Scholar
16. Head, A.K., Humble, P., Clarebrough, L.M. and Forward, C.T.. Computed Electron Micrographs and Defect Identification, North Hollad, Amsterdam, (1973) pp.309 Google Scholar
17. Schaublin, R. and Stadelmann, P., Mater. Sci. Eng. A 164, 373 (1993)Google Scholar
18. Hemker, K.J. and Mills, M.J., Phil. Mag. A 68, 305 (1993)Google Scholar
19. Drabik, W. and Torun, J., Phy. Stat. Sol. (a) 77, 513 (1983)Google Scholar
20. Yoo, M.H. and Fu, C.L., Advanced High Temperature Intermetallics, 31, 1048(1991)Google Scholar