Hostname: page-component-745bb68f8f-5r2nc Total loading time: 0 Render date: 2025-01-26T05:05:27.909Z Has data issue: false hasContentIssue false
  • English
  • Français

The Deformation Microstructure in NI3Si Polycrystals Strained Over the Range of Temperature of Flow Stress Anomaly

Published online by Cambridge University Press:  26 February 2011

B. Tounsia ,
P. Beauchamp ,
Y. Mishima ,
T. Suzuki  and
P. Veysslière
B. Tounsia
Affiliation:
Laboratoire de Métallurgie Physique, Faculté des Sciences, 40 Avenue du Recteur Pineau, 86022 Poitiers, France.
P. Beauchamp
Affiliation:
Laboratoire de Métallurgie Physique, Faculté des Sciences, 40 Avenue du Recteur Pineau, 86022 Poitiers, France.
Y. Mishima
Affiliation:
Research Laboratory of Precision Machinery and Electronics, Tokyo Institute of Technology, Nagatsuta, Midori-Ku, Yokohama 227, Japan.
T. Suzuki
Affiliation:
Research Laboratory of Precision Machinery and Electronics, Tokyo Institute of Technology, Nagatsuta, Midori-Ku, Yokohama 227, Japan.
P. Veysslière
Affiliation:
LEM, CNRS-ONERA, B.P. 72,92322 Châtillon Cedex. France.
Get access

Abstract

In order to correlate the flow stress anomaly of Ni3Si with dislocation properties, a weakbeam study ofpolycrystalline samples deformed between ambient and the peak temperature was carried out. Samples with two extreme Ni/Si ratios were tested.The most frequently activated slip system changes progressively from octahedral to cubic with increasing temperature. The transformation of superdislocations into Kear-Wilsdorf configurations gives rise to screw dislocations that are rectilinear only after deformation at room temperature. The effect of temperature is to gradually promote bending of Kear-Wisdorf configurations in the cube plane, from a few nanometers at 230°C to several tenths of micrometers at intermediate temperature. Cube slip begins to be massively activated a little below the peak temperature. It is suggested that the flow stress anomaly is controlled by progressive exhaustion of octahedral slip by thermally-activated expansion of superdislocations on the cube cross-slip plane.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 133: Symposium H – High-Temperature Ordered Intermetallic Alloys III , 1988 , 731
Copyright
Copyright © Materials Research Society 1989

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] Suzuki, T., Oya, Y. and Ochiai, S., Metall. Trans. A, 15A (1984) 173.CrossRefGoogle Scholar
[2] Noguchi, O., Oya, Y. and Suzuki, T., Metall. Trans. A, 12A (1981) 1647.Google Scholar
[3] Tounsi, B., PhD Thesis, University of Poitiers, 1988.Google Scholar
[4] Tounsi, B. and Veyssière, P., in preparation.Google Scholar
[5] Cockayne, D.J.H., J. Physique, 35 (1974) C7–141.Google Scholar
[6] Edington, J. W., Practical Electron Microscopy in Materials Science, Philips Technical Library (MacMillan, London, 1975), vol.3.Google Scholar
[7] Veyssière, P., Phil. Mag. A, 50 (1984) 189.CrossRefGoogle Scholar
[8] Veyssière, P., in High Temperature Ordered Intermetallic Alloys III, edited by Koch, C.C., Liu, C.T., Stoloff, N.S. and Taub, A.I., (Mater. Res. Soc. Proc. 133, Pittsburg, PA 1988).Google Scholar
[9] Veyssière, P., Guan, D.L. and Rabier, J., Phil. Mag. A, 49 (1984) 45.Google Scholar
[10] Douin, J., Veyssière, P. and Beauchamp, P., Phil. Mag. A, 54 (1986) 375.Google Scholar
[11] Kear, B.H. and Wilsdorf, H.G.F., Trans. Metall. Soc. A.I.M.E., 224 (1962) 382.Google Scholar
[12] Sun, Y.Q. and Hazzledine, P.M., Phil. Mag. A, 58 (1988) 603.Google Scholar
[13] Korner, A., Phil. Mag. A, 58 (1988) 507.CrossRefGoogle Scholar