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Dislocation patterning in fatigued silicon single crystals

  • M. Legros (a1), O. Ferry (a2), J.-P. Feiereisen (a2), A. Jacques (a2) and A. George (a2)...

Abstract

Tension compression fatigue tests and subsequent TEM observations were conducted on single crystalline silicon in a temperature and strain rate domain where lattice friction is still effective: 800-900°C and 1.5 to 6x10-4s-1. Samples oriented for single slip conditions were cyclically loaded under plastic strain amplitude control. For amplitudes ranging from 6x10-4 to 10-2, cyclic stress-strain curves exhibit two different stages of hardening and pass through a maximum before saturation is reached. TEM observations suggest that strain localization takes place near the maximum cyclic stress and beyond. Before mechanical saturation, edge dislocation dipoles sit mainly in thick rectilinear walls. Once the maximum stress is reached, these thick walls “condense” in much thinner walls that seem to carry out the imposed deformation while other regions become inactive. In this case, the dislocation structure anneals out and a loop structure is created from the dipolar walls.

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1. Grosskreutz, J.C. and Mughrabi, H., “Description of the work-hardened structure at low temperature in cyclic deformation”, Constitutive equations in plasticity, ed. Argon, A.S.., (The MIT Press, 1975). 251326.
2. Laird, C., in Treatise on Materials Science and Technology, Arsenault, R.J., Editor. 1975, Academic Press: New York. p. 101.
3. Magnin, T., Mem. Etud. Sci. Rev. Metall. 88 3348 (1991).
4. Pedersen, O.B., Acta Metall. Mater. 38 12211239 (1990).
5. Pedersen, O.B., Phil. Mag. A 73 829858 (1996).
6. Brown, L.M., Mat. Sci. Eng. A 285 3542 (2000).
7. Inui, H., Hong, S.I., and Laird, C., Acta Metall Mater 38 22612274 (1990).
8. Laird, C. in Deformation-Induced Microstructures: Analysis and Relation to Properties. Proceeding of the 20th Risöe International Symposium on Materials Science, 1999.
9. George, A., Mat. Sci. Eng. A 233 88102 (1997).
10. Louchet, F., “Plasticité des métaux de structure cubique centrée”, Dislocations et déformation plastique-Yravals 1979, ed. Groh, P., Kubin, L., and Martin, J.-L.., (Editions de Physique, 1980). 149159.
11. Scoble, W.R.J. and Weissmann, S., Crystal Lattice Defects 4 123136 (1973).
12. Legros, M., Jacques, A., and George, A., Mat. Sci. Eng. A 309-310 233236 (2001).
13. Legros, M., Jacques, A., and George, A., Phil. Mag. A 82 32753288 (2002).
14. Legros, M., Ferry, O., Feiereisen, J.-P., Jacques, A., and George, A., J. Phys.: Condens. Matter 14 1287112882 (2002).
15. Mughrabi, H., Mat. Sci. Eng. 33 207223 (1978).
16. Mecke, K. and Blochwitz, C., Crystal Res. & Technol. 17 743758 (1982).

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