Dislocation-Stacking Fault Tetrahedron Interactions in Cu

Journal of Engineering Materials and Technology - Tập 124 Số 3 - Trang 329-334 - 2002
Brian D. Wirth1, Vasily V. Bulatov1, T. Dı́az de la Rubia1
1Chemistry and Materials Science Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550

Tóm tắt

In copper and other face centered cubic metals, high-energy particle irradiation produces hardening and shear localization. Post-irradiation microstructural examination in Cu reveals that irradiation has produced a high number density of nanometer sized stacking fault tetrahedra. The resultant irradiation hardening and shear localization is commonly attributed to the interaction between stacking fault tetrahedra and mobile dislocations, although the mechanism of this interaction is unknown. In this work, we present results from a molecular dynamics simulation study to characterize the motion and velocity of edge dislocations at high strain rate and the interaction and fate of the moving edge dislocation with stacking fault tetrahedra in Cu using an EAM interatomic potential. The results show that a perfect SFT acts as a hard obstacle for dislocation motion and, although the SFT is sheared by the dislocation passage, it remains largely intact. However, our simulations show that an overlapping, truncated SFT is absorbed by the passage of an edge dislocation, resulting in dislocation climb and the formation of a pair of less mobile super-jogs on the dislocation.

Từ khóa


Tài liệu tham khảo

Mansur, L. K., and Bloom, E. E., 1982, “Radiation Effects in Reactor Structural Alloys,” J. Met., 34, pp. 23–31.

Lucas, G. E. , 1993, “The Evolution of Mechanical Property Change in Irradiated Austenitic Stainless Steels,” J. Nucl. Mater., 206, pp. 287–305.

Singh, B. N., and Zinkle, S. J., 1993, “Defect Accumulation in Pure FCC Metals in the Transient Regime: A Review,” J. Nucl. Mater., 206, pp. 212–229.

Trinkaus, H., Singh, B. N., and Foreman, A. J. E., 1997, “Segregation of Cascade Induced Interstitial Loops at Dislocations: Possible Effect on Initiation of Plastic Deformation,” J. Nucl. Mater., 251, pp. 172–187.

Victoria, M., Baluc, N., Bailat, C., Dai, Y., Luppo, M. I., Schaublin, R., and Singh, B. N., 2000, “The Microstructure and Associated Tensile Properties of Irradiated FCC and BCC Metals,” J. Nucl. Mater., 276, pp. 114–122.

Dai, Y., and Victoria, M. , 1997, “Defect Cluster Structure and Tensile Properties of Copper Single Crystals Irradiated With 600 MeV Protons,” Mat. Res. Soc. Symp. Proc., Vol. 439, pp. 319–324.

Ghoniem, N. M., Tong, S.-S., and Sun, L. Z., 2000, “Parametric Dislocation Dynamics: A Thermodynamics-Based Approach to Investigations of Mesoscopic Plastic Deformation,” Phys. Rev. B, 139(1), pp. 913–927.

Diaz de la Rubia, T., Zbib, H. M., Khraishi, T. A., Wirth, B. D., Victoria, M., and Caturla, M. J., 2000, “Plastic Flow Localization in Irradiated Materials: A Multiscale Modeling Approach,” Nature (London), 406, pp. 871–874.

Wirth, B. D., Caturla, M. J., Diaz de la Rubia, T., Khraishi, T., and Zbib, H., 2001, “Mechanical Property Degradation in Irradiated Materials: A Multiscale Modeling Approach,” Nuclear Instruments and Methods B, 180, pp. 23–31.

Diaz de la Rubia, T., and Guinan, M. W., 1992, “New Mechanism of Defect Production in Metals: a Molecular-Dynamics Study of Interstitial-Dislocation-Loop Formation in High-Energy Displacement Cascades,” Phys. Rev. Lett., 66, pp. 2766–2769.

Phythian, W. J., Stoller, R. E., Foreman, A. J. E., Calder, A. F., and Bacon, D. J., 1995, “A Comparison of Displacement Cascades in Copper and Iron by Molecular Dynamics and Its Application to Microstructural Evolution,” J. Nucl. Mater., 223, pp. 245–261.

Averback, R. S., and Diaz de la Rubia, T., 1998, “Displacement Damage in Irradiated Metals and Semiconductors,” Solid State Phys., 51, pp. 281–402.

Osetsky, Y. N., Bacon, D. J., Serra, A., Singh, B. N., and Golubov, S. I. Y., 2000, “Stability and Mobility of Defect Clusters and Dislocation Loops in Metals,” J. Nucl. Mater., 276, pp. 65–77.

Wirth, B. D., Bulatov, V., and Diaz de la Rubia, T., 2000, “Atomistic Simulation of Stacking Fault Tetrahedra Formation in Cu,” J. Nucl. Mater., 283–287, pp. 773–777.

Caturla, M. J., Soneda, N., Alonso, E. A., Wirth, B. D., and Diaz de la Rubia, T., 2000, “Comparative Study of Radiation Damage Accumulation in Cu and Fe.” J. Nucl. Mater., 276, pp. 13–21.

Rodney, D., and Martin, G., 2000, “Dislocation Pinning by Glissile Interstitial Loops in a Nickel Crystal: A Molecular-Dynamics Study,” Phys. Rev. B, 61, pp. 8714–8725.

Silcox, J., and Hirsch, P. B., 1959, “Direct Observations of Defects in Quenched Gold,” Philos. Mag., 4, pp. 72–89.

Osetsky, Y. N., and Bacon, D. J., 2001, “Defect Cluster Formation in Displacement Cascades in Copper,” Nuclear Instruments and Methods B, 180, pp. 85–90.

Diaz de la Rubia, T., and Guinan, M. W., 1990, “Progress in The Development of a Molecular Dynamics Code for High-Energy Cascade Studies,” J. Nucl. Mater., 174, pp. 151–157.

Foiles, S. M., Baskes, M. I., and Daw, M. S., 1986, “Embedded-Atom-Method Functions for the FCC Metals Cu, Ag, Au, Ni, Pd, Pt, and Their Alloys,” Phys. Rev. B, 33, pp. 7983–7991.

M. Ghaly and R. S. Averback, personal communication.

Thông tin
Thông tin xuất bản

Journal of Engineering Materials and Technology

Tập 124 Số 3

329-334

Thông tin tác giả