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http://dx.doi.org/10.14346/JKOSOS.2012.27.3.015

Fatigue Behavior of Fine Grained AM60 Magnesium Alloy Produced by Severe Plastic Deformation  

You, In-Dong (Graduate School of Railroad, Seoul National University of Science and Technology)
Lee, Man-Suk (Graduate School, Seoul National University of Science and Technology)
Kim, Ho-Kyung (Department of Automotive Engineering, Seoul National University of Science and Technology)
Publication Information
Journal of the Korean Society of Safety / v.27, no.3, 2012 , pp. 15-19 More about this Journal
Abstract
The fatigue behavior of AM60 magnesium alloy produced by equal channel angular pressing(ECAP) process was investigated through fatigue lifetime and fatigue crack propagation rate tests. The grain structure of the material was refined from 19.2 ${\mu}m$ to 2.3 ${\mu}m$ after 6 passes of ECAP at 493 K. The yield strength(YS) and ultimate tensile strength (UTS) increase after two passes but decrease with further pressing, although the grain size becomes finer with increasing pass number. The softening effect due to texture anisotropy overwhelmed the strengthening effect due to grain refinement after 2 passes. A large enhancement in fatigue strength was achieved after two ECAP passes. The current finding suggests that two passed material is better than the multi-passed material in view of the static strength and fatigue performance.
Keywords
AM60 magnesium alloy; ECAP; microstructure; fatigue crack propagation rate; fatigue lifetime;
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1 B. L. Mordike, and T. Ebert. "Magnesium Propertiesapplications- potentials", Mater Sci. Eng., Vol. A302, pp. 37-45, 2001.   DOI   ScienceOn
2 R. Z. Valiev, and T. G. Langdon, "Principles of Equalchannel Angular Pressing as a Processing Tool for Grain Refinement", Progress in Materials Science, Vol. 51, No. 7, pp. 881-981, 2006.   DOI   ScienceOn
3 S. M. Masoudpanah, and R. Mahmudi "The Microstructure, Tensile, and Shear Deformation Behavior of an AZ31 Magnesium Alloy after Extrusion and Equal Channel Angular Pressing", Materials & Design, Vol. 31, No. 7, pp. 3512-3517, 2010.   DOI   ScienceOn
4 H. K. Kim, and W. J. Kim, "Microstructural Instability and Strength of an AZ31 Mg Alloy After Severe Plastic Deformation", Materials Science and Engineering A, Vol. 385, No. 1-2, pp. 300-308, 2004.   DOI
5 Y. Iwahashi, Z. Horita, M. Nemoto, and T. G. Langdon, "The Process of Grain Refinement in Equal-channel Angular Pressing", Acta Materialia, Vol. 46, No. 9, pp. 3317-3331, 1998.   DOI   ScienceOn
6 W. J. Kim, S. I. Hong and Y. S. Kim, "Texture Development and its Effect on Mechanical Properties of an AZ61 Mg Alloy Fabricated by Equal Channel Angular Pressing", Acta Materialia, Vol. 51, No. 11, pp. 3293-3307, 2003.   DOI   ScienceOn
7 A. Vinogradov, S. Nagasaki, V. Patlan, K. Kitagawa and M. Kawazoe, "Fatigue Properties of 5056 Al-Mg Alloy Produced by Equal-channel Angular Pressing", NanoStruct. Mater. Vol.11 No.7, pp. 925-934, 1999.   DOI   ScienceOn
8 D. S. Dugdale, "Yielding of Steel Sheets Containing Slots", Journal of Mechanics and Physics of Solid, Vol. 8, pp. 100-104, 1960.   DOI   ScienceOn