Observation of Dislocation Microstructures and Simulation of Stress Field during Fatigue Crack Initiation in a Copper Single Crystal

Abstract:

How a crack initiates from the smooth surface of single crystals subjected to uniaxial cyclic loading is unclear. Experiments were conducted to observe in detail the dislocation microstructures during the saturation stage of cyclic deformation in a copper single crystal using scanning electron microscopy and the electron channeling contrast (SEM–ECC) technique. Some dark zones were found in the dislocation microstructures, which were located either at the edge region of the specimen or within the persistent slip bands (PSBs) at the matrix/PSB interfaces. Hence, fatigue cracks will initiate at these sites with high stress concentrations, i.e., the dark zones. Also, dislocation dynamics (DD) simulation was adopted to calculate internal stress distributions induced by dislocations, and finite element analysis (FEA) used to obtain stress distribution at the matrix/PSB interfaces and neighboring micro-regions caused by an externally applied load. Simulation results show that the external shear stresses distribute uniformly in all specimens; while near the free-surface regions, the maximum value of internal stresses not only occurs at interfaces between PSBs and dislocation matrix, but also at locations where these interfaces cross the freesurface. Consequently, the interfaces are most probable sites for nucleated cracks. Finally, the simulation results agree well with experimental observations.

• Periodical: Key Engineering Materials (Volume 312)
• Pages: 71-76
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.312.71
• Online since: June 2006
• Authors: J.H. Yang, Xiao Ping Zhang, Yiu Wing Mai, W. Yan
• Keywords: Copper Single Crystal, Dislocation Microstructures, Fatigue Crack Initiation, Stress Field Simulation

References

[1] S. Suresh: Fatigue of Materials (Cambridge University Press, Cambridge, UK, 1998), p.132.

[2] K.J. Miller and E. R. de los Rios: Short Fatigue Crack (European Structural Integrity Society Publication, London, 1992), p.55.

[3] M. Sauzay and P. Gilormini: Fatigue and Fracture of Engineering Materials and Structures, Vol. 23 (2000), p.573.

[4] B. T. Ma and C. Laird: Acta Metallurgica, Vol. 37 (1989), p.325.

[5] K. Katigirl, A. Omura, K. Koyanagi, J. Awatani, T. Shiraishi and H. Kaneshiro: Metall. Trans. A Vol. 8 (1977), p.1769.

[6] K. Differt, U. Essmann and H. Mughrabi: Phil. Mag. A Vol. 54 (1986), p.237.

[7] J.G. Antonopoulos, L.M. Brown and A.T. Winter: Phil. Mag Vol. 34 (1976), p.549.

[8] U. Essmann, U. Gösele and H. Mughrabi: Phil. Mag. A Vol. 44 (1981), p.405.

[9] M. Kato, S. Onaka, T. Mori and T. Mura: Scrit. Metall Vol. 18 (1984), p.1323.

[10] P. Luk�� and L. Kunz: Mater. Sci. Eng A Vol. 314 (2001), p.75.

[11] E.A. Repetto and M. Ortiz: Acta Mater. Vol. 45 (1997), p.2577.

[12] J.H. Yang, Y. Li, S.X. Li, C.X. Ma and G. Y. Li: Mater. Sci. Eng. A Vol. 299 (2001), p.51.

[13] J.H. Yang, Y. Li, Z. Cai, S.X. Li, C.X. Ma, E. Han and W. Ke: Mater. Sci. Eng. A Vol. 345 (2003), p.164.