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Single Crystal Deformation Experiments for Validation of Dislocation Dynamics Simulations

Published online by Cambridge University Press:  15 February 2011

David H. Lassila ,
Mary M. LeBlanc  and
Moono Rhee
David H. Lassila
Affiliation:
Lawrence Livermore National Laboratory, P.O. Box 808 L-113, Livermore, CA 94551-0808.
Mary M. LeBlanc
Affiliation:
Lawrence Livermore National Laboratory, P.O. Box 808 L-113, Livermore, CA 94551-0808.
Moono Rhee
Affiliation:
Lawrence Livermore National Laboratory, P.O. Box 808 L-113, Livermore, CA 94551-0808.
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Abstract

A new experimental apparatus has been developed for performing compression deformation experiments on high-purity Mo single crystals. These experiments provide data that can validate 3-D dislocation dynamics (DD) simulations. The experiments are performed under conditions that allow unconstrained deformation; thus, a relatively uniform state of axial stress is maintained during deformation. In the following sections, we describe the new experimental apparatus and our results from experiments performed at ambient temperature at a strain rate of s–1. Validation criteria based on the Mo experiments may include comparing the stress-strain response using 3-D strain information, the predicted slip-system yield, and work-hardening behavior.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 779: Symposium W – Multiscale Phenomena in Materials - Experiments and Modeling Related to Mechanical Behavior , 2003 , W2.9
Copyright
Copyright © Materials Research Society 2003

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References

1. Devincre, B., Pontikis, V., Brechet, Y., Canova, G., Condat, M., and Kubin, L., “Three-Dimensional Simulations of Plastic Flow in Crystals,” Microscopic Simulations of Complex Hydrodynamic Phenomena, edited by Mareshal, M. and Holian, B. (Plenum Press, New York, 1992), pp. 413–423.Google Scholar
2. Zbib, H., Rhee, M., and Hirth, J., “3-D Simulation of Curved Dislocations: Discretization and Long-Range Interactions,” Advances in Engineering Plasticity and Its Applications, edited by Abe, T. and Tsuta, T. (New York, Elsevier Science, 1996), pp. 15–20.Google Scholar
3. Schwarz, K. and Tersoff, J., “Interaction of Threading and Misfit Dislocations in a Strained Epiaxial Layer,” Appl. Phys. Lett. 69, 1220–1222 (1996).Google Scholar
4. Ghoniem, N. M. and Bacaloni, M., “Finite Segment Method for 3-D Dislocation Dynamics,” University of California at Los Angeles, Los Angeles, CA, Eng. Report No. UCLA/MATMOD-97-01 (1997).Google Scholar
5. Rhee, M., Lassila, D., Bulatov, V. V., Hsiung, L., and Rubia, T. Diaz de la, “Dislocation Multiplication in bcc Molybdenum: A Dislocation Dynamics Simulation,” Phil. Mag. Letters 81(9), 595–605 (2001).Google Scholar
6. Christian, J. W., “Some Surprising Features of the Plastic Deformation of Body-Centered Cubic Metals and Alloys,” Metall. Trans. (A) 14A, 1237–1255 (1983).Google Scholar
7. Arsenault, R. J., “Low Temperature of Deformation of bcc Metals and Their Solid-Solution Alloys,” Treatise on Mater. Sci. and Tech. 6, 1–99 (1975).Google Scholar
8. Hsiung, L., Lawrence Livermore National Laboratory, Livermore, CA, personal communication (2001).Google Scholar
9. Taylor, G. I., “Plastic Strain in Metals,” J. Inst. Metals 62, 307–324 (1938).Google Scholar
10. Bishop, J. F. and Hill, R., “A Theoretical Derivation of the Plastic Properties of a Polycrystalline Face-Centered Metal,” Phil. Mag. 42, 1298–1307 (1951).Google Scholar
11. Hutchinson, J. W., “Plastic Deformation of bcc Polycrystals,” J. Mech. Phys. Solids 12, 25–33 (1963).Google Scholar
12. Kelly, A. and Groves, G. W., Crystallography and Crystal Defects, (Harlow, U.K.: Longman Group, 1970), pp. 178–184.Google Scholar
13. Tang, M., Kubin, L. P., and Canova, G. R., “Dislocation Mobility and the Mechanical Response of bcc (Ta) Single Crystals: A Mesoscopic Approach,” Acta Mater., 46, 3221–3229 (1998).Google Scholar
14. Bulatov, V., Cai, W., and Rhee, M., Periodic Boundary Conditions for Dislocation Dynamics Simulations in Three Dimensions, edited by Kubin, L. P., Bassani, J. L., Cho, K., Gao, H., and L, R.. Selinger, B. (Mater. Res. Soc. Symp. 653, 2001).Google Scholar