Micro-mechanical analysis and TEM study of crack initiation in dislocation free zone
Source abstract
Abstract
Dislocation emission, dislocation-free zone (DFZ) formation and crack initiation in the DFZ and/or at the crack tip were analyzed by micromechanics. The results show that a DFZ is formed after dislocation emission under constant load. The DFZ size decreases with increase in the applied stress intensity factor KIa or lattice friction stress τf. There are two stress peaks ahead of the crack tip. The first one is located at the blunt crack tip and the second one in the DFZ. With increasing in the applied stress intensity factor KIa, the peak stress at the crack tip may decrease while the peak stress in the DFZ increases monotonically. Microcrack will initiate when the peak stress is equal to the cohesive strength. In situ tensile tests in a transmission electron microscope (TEM) show that microcrack initiates in DFZ or/and at a blunt crack tip after dislocation emitting and DFZ formation.
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Research context
OpenAlex topics: Semiconductor materials and interfaces · Electronic Packaging and Soldering Technologies · Advanced ceramic materials synthesis
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References (24)
Show source-provided references
1. Bilby, B.A., Cottrell, A.H. and Swinden, K.H. (1963). Proc. R. Soc 272, 304–-.
2. Chen, Q.Z., Chu, W.Y. and Hsiao, C.M. (1995). Acta Metall. Mater. 43, 4371–?.10.1016/0956-7151(95)00122-C ↗
3. Chen, Q.Z., Gao, K.W., Zhang, Y. and Chu, W.Y. (1998). Fatigue Frac Eng Mater Struc. 21, 981–-.
4. Dai, S.H. and Li, J.C.M. (1982). Scr. Metall. 16, 183–-.10.1016/0036-9748(82)90382-9 ↗
5. Dundurs, J. and Mura, T. (1964). J. Mech. Phys. Solids 12, 177–-.10.1016/0022-5096(64)90017-1 ↗
6. Fischer, L.L. and Beltz, G.E. (2001). J. Mech. Phys. Solids 49, 635–-.10.1016/S0022-5096(00)00042-9 ↗
7. Gao, K.W., Chu, W.Y., Gu, B., Zhang, T.Z. and Qiao, L.J. (2000). Corrosion 56, 515–-.10.5006/1.3280556 ↗
8. Lakshmanan, V. and Li, J.C.M. (1988). Mater. Sci. Eng. A104, 95–-.10.1016/0025-5416(88)90410-7 ↗
9. Lii, M.J., Chen, X.F., Katz, Y. and Gerberich, W.W. (1990). Acta Metall. 38, 2435–-.10.1016/0956-7151(90)90255-F ↗
10. Lu, H., Li, M.D., Zhang, T.C. and Chu, W.Y. (1997). Science in China E 40, 530–-.10.1007/BF02917169 ↗
11. Marsh, P.G., Zielinski, W., Huang, H. and Gerberich, W.W. (1992). Acta Metall. 40, 2883–-.10.1016/0956-7151(92)90453-L ↗
12. Muskhelishvili, N.I. (1963). Some basic problens of mathematical theory of elasticity. P. Noordhoff Ltd., Groningen, The Netherlands.
13. Ohr, S.M. (1983). Mater. Sci. Eng. 59, 1–-.10.1016/0025-5416(83)90085-X ↗
14. Ohr, S.M. (1985). Mater. Sci. Eng. 72, 1–-.10.1016/0025-5416(85)90064-3 ↗
15. Qiao, L.J., Mao, X. and Chen, Q.Z. (1995). Metall. Mater. Trans. A 26, 1461–-.10.1007/BF02647597 ↗
16. Rice, J.R. (1992). J. Mech. Phys. Solids 40, 239–-.10.1016/S0022-5096(05)80012-2 ↗
17. Santare, M.H. (1995). J. Appl. Mech. ASME 62, 537–-.10.1115/1.2895965 ↗
18. Stagni, L. and Lizzio, R. (1983). J. Appl. Phys. A30, 217–-.10.1007/BF00614769 ↗
19. Su, Y.J., Wang, Y.B. and Chu, W.Y. (1997). Scripta Mater 36, 1239–-.10.1016/S1359-6462(97)00020-1 ↗
20. Yen, W.J. and Hwu, C. (1994). J. Appl. Mech., ASME 61, 548–-.10.1115/1.2901494 ↗
21. Zhang, T.Y. and Qian, C.F. (1996). Acta Mater. 44, 4513–-.10.1016/1359-6454(96)00066-3 ↗
22. Zhang, Y., Wang, Y.B. and Chu, W.Y. (1994). Scripta Metall Mater 30, 541–-.10.1016/0956-716X(94)90426-X ↗
23. Zhang, T.Y. and Li, J.C.M. (1991). Acta Metall Mater 39, 2739–-.10.1016/0956-7151(91)90091-E ↗
24. Zhu, T., Yang, W. and Gao., T. (1996). Acta Mater. 44, 3049–-.10.1016/1359-6454(95)00436-X ↗