Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Nano-Scale Observation of Fatigue Striations for Aluminum Alloy

알루미늄 합금 피로 스트라이에이션의 나노 스케일 관찰

  • Published : 2001.07.01
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Abstract

Atomic Force Microscope (AFM) was used to study cross sectional profiles and dimensions of fatigue striations in 2017-T351 aluminum alloy. Their widths(SW) and heights (SH, SH(sub)h, SH(sub)ι) were measured from the cross sectional profiles of three-dimension AFM images. The following results that will be helpful to understand the fatigue crack growth mechanism were obtained. (1) The relation of SH=$\alpha$(SW)(sup)1.2 was obtained. (2) The ratio of the striation height to its width SH/SW, SH(sub)h/SW and SH(sub)ι/SW did not depend on the stress intensity factor range ΔK and the stress ratio R( =P(sub)min/P(sub)max = K(sub)min/K(sub)max). (3) Effect of precipitate on the morphology of striation was changed by the relative dimensional difference between the striation width SW and the precipitates. From these results, the applicability of the AFM to nano-fractography is discussed.

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References

  1. Koterazawa, R., 1981, Fractography and its application, Nikkan Kogyo Shinbunsha
  2. Laird, C., 1967, 'The Influence of Metallurgical Structure on the Mechanisms of Fatigue Crack Propagation,' ASTM STP., Vol. 415, pp. 131-168
  3. McMillan, J. C. and Pelloux, R.M.N., 1967, 'Fatigue Crack Propagation Under Program and Random Load,' ASTM STP, Vol. 415, pp. 505-532
  4. Kitsunai, Y. and Maeda, Y., 1987, 'Fatigue Failure Analysis of Machine Parts by means of Fractography,' J. Soc. Mater. Science, Japan, Vol. 36, pp. 431-436
  5. Jono, Y., Song, J. H., Mikami, S. and Ohgakai, M., 1984, 'Fatigue Crack Growth and Crack Closure Behavior of Structural Materials,' J. Soc. Mater. Science, Japan, Vol. 33, pp. 468-474
  6. Hurukawa, K., Murakami, Y. and Nishida, S., 1998, 'A Method for Determining Stress Ratio of Fatigue Loading from The Width and Height of Striation,' Int. J. Fatigue., Vol. 20, pp. 509-516 https://doi.org/10.1016/S0142-1123(98)00016-4
  7. Sarid, D., 1991, Oxford Series on Optical Science - Scanning Force Microscopy, Oxford University Press
  8. Ching, S. and Wilson, R. J., 1991, 'Surface Imaging by Scanning Tunneling Microscopy,' in Images of Materials., Edited by Wilson, D. B., Pelton, A. R. and Grosky, R., pp. 241-265
  9. Sriram, T. S., Fine, M. E. and Chung, Y. W., 1992, 'The Application of Surface Science to Fatigue: The Role of Surface Chemistry and Surface Modification in fatigue Crack Initiation in Silver Single Crystals,' Acta Metall. Mater., Vol. 40, pp. 2769-2780 https://doi.org/10.1016/0956-7151(92)90347-H
  10. Nakai, Y., Fukuhara, S. and Ohnishi, K., 1996, 'Microscopic Observation of Fatigue Slip Bands and Fatigue Cracks by Scanning Atomic Force Microscopy,' Proc. 73rd JSME, Annual Meeting, II, pp. 418-419
  11. Komai, K., Minoshima, K. and Miyawaki, T., 1996, 'In-Situ Observation of Stress Corrosion Cracking of High-Strength Aluminum Alloy by Scanning Atomic Force Microscopy and Influence of Vacuum,' Trans. JSME, A-62, pp. 1827-1833
  12. 최성종, 권재도, Hitoshi ISHII, 2000, '원자력 현미경(AFM)에 의한 알루미늄 합금의 피로 스트라이에이션 관찰,' 대한기계학회 논문집, 제24권, 제4호, pp. 955-962
  13. John, R. N., 1992, ASM Handbook Volume 8-Mechanical Testing, pp. 377-402
  14. Magonov, S. N. and Whangbo, M. H., 1996, Surface Analysis with STM and AFM, VCH, pp. 21-46
  15. Rice, J. R., 1967, 'Mechanics of Crack Tip deformation and Extension by Fatigue,' ASTM STP, 415, pp. 247-309
  16. Elber, W., 1971, 'The Significance of Fatigue Crack Closure,' ASTM STP, 486, pp. 230-242
  17. Choi, S. J., Ishii, H. and Tohgo, K., 1996, 'Nano-Scale Surface Observation of Cyclically Deformed Copper and Cu-Al Single Crystals,' APCFS'96, pp. 683-688