Hostname: page-component-848d4c4894-sjtt6 Total loading time: 0 Render date: 2024-06-26T02:24:49.187Z Has data issue: false hasContentIssue false
  • English
  • Français

Modeling of the Dislocation Dynamics in Ni3Al and the Flow Stress Anomaly

Published online by Cambridge University Press:  15 February 2011

B. Devincre ,
P. Veyssiere ,
L. Kubin  and
G. Saada Lem
B. Devincre
Affiliation:
CNRS-ONERA, 92322 Chatillon, France
P. Veyssiere
Affiliation:
CNRS-ONERA, 92322 Chatillon, France
L. Kubin
Affiliation:
CNRS-ONERA, 92322 Chatillon, France
G. Saada Lem
Affiliation:
CNRS-ONERA, 92322 Chatillon, France
Get access

Abstract

Ni3Al single crystals are known to exhibit a flow stress anomaly between 200 and 800K. The purpose of our work is to examine such an anomaly by means of a simulation of the dislocation dynamics at a mesoscopic scale. The simulation basic rules are: i) the dislocation glide in {111} octahedral planes, ii) the conditions at which screw lines are locked and unlocked by the formation of Kear-Wilsdorf locks, iii) the mobility of jogs in the {100} cube plane. Our results suggest that two different temperature regimes occur in the domain of the anomaly. At low temperatures, the plastic flow is governed by kink bow-out, itself a function of the kink length. At high temperatures, the plastic flow is governed by the unlocking of the weakest Kear-Wilsdorf locks in the microstructure. These outcomes of the simulation are discussed in relation with the existing theoretical models of the flow stress anomaly.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 535
Copyright
Copyright © Materials Research Society 1997

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] Caillard, D. and Couret, A., in Dislocations in Solids, Vol. 10, ed. Nabarro, F.R.N. (Amsterdam: North-Holland) (1996)Google Scholar
[2] Veyssiere, P. and Saada, G., in Dislocations in Solids, Vol. 10, ed. Nabarro, F.R.N. (Amsterdam: North-Holland) (1996)Google Scholar
[3] Takeuchi, S. and Kuramoto, E., Acta Metall. 21, 415 (1973)Google Scholar
[4] Paidar, V., Pope, D.P. and Vitek, V., Acta Metall., 32 435 (1984)Google Scholar
[5] Mills, M.J., Baluc, N. and Karnthaler, H.P., Mater. Res. Soc. Proc, 133 203 (1989)Google Scholar
[6] Veyssiere, P., Mater. Res. Soc. Proc, 213 175 (1989)Google Scholar
[7] Hirsch, P.B., Phil. Mag. A, 65 569 (1992)Google Scholar
[8] Caillard, D. and Paidar, V., Acta Mater, in press (1996)Google Scholar
[9] Couret, A. and Caillard, D., J. Phys. III, 1 885 (1991)Google Scholar
[10] Mills, M.J. and Chzran, D.C., Acta Metall., 40 3051 (1992)Google Scholar
[11] Devincre, B. and Kubin, L. P., Modelling Simul. Mater. Sci. Engng., 2 559 (1994)Google Scholar
[12] Devincre, B. and Roberts, S. G., Acta Metall, 44 2891 (1996)Google Scholar
[13] Devincre, B.,, in Computer simulation in Materials Science, edited by Kirchner, H.O., H.O., , Kubin, L. and Pontikis, V., NATO ASI Series, Series E Vol. 308 (Dordrecht: Kluwer), p. 309 (1995)Google Scholar
[14] Devincre, B., Veyssiere, P., Kubin, L. P. and Saada, G., Phil Mag A, in pressGoogle Scholar
[15] Saada, G. and Veyssiere, P., Phil. Mag. A, 70 925 (1994)Google Scholar