Abstract
The purpose of this paper is to quantify the microstructurally small/physically small crack growth behavior in an extruded AZ61 magnesium alloy, Fully-reversed, interrupted load control tests were conducted on notched specimens that were taken from a magnesium alloy extrusion, In order to measure crack growth, replicas of the notch surface were made using a two-part siliconrubber compound at periodic cyclic intervals, Scanning electron microscopy analysis of the replica surfaces revealed multi site crack initiation and subsequent crack coalescence, The crack growth behavior of the small fatigue cracks was shown to have a strong dependence on the material microstructure as the crack was submitted to a tortuous growth path along grain boundaries and crystallographic slip planes, A microstructurally dependent crack growth model that was previously developed for FCC metals was further extended here to HCP metals.
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References
E. Aghion and B. Bronfin, “Magnesium Alloys Development towards the 21st Century,” Materials Science Forum, vol. 350–351, pp. 19–30, 2000.
“Magnesium Vision 2020: A North American Automotive Strategic Vision for Magnesium, U.S. Automotive Materials Partnership, (USAMP) U.S. Council for Automotive Research (USCAR),” Sept. 2010. www.uscar.org.
J. F. King, “Development of magnesium diecasting alloys,” in Magnesium Alloys and their Applications, pp. 37–47, Werkstoff-Infomationsgesellschaft, 1998.
H. R. Mayer, H. Lipowsky, M. Papakyriacou, R. Rösch, A. Stich, and S. E. Stanzl-Tschegg, “Application of ultrasound for fatigue testing of lightweight alloys,” Fatigue Fracture of Engineering Materials and Structures, vol. 22, pp. 591–599, July 1999.
L. J. Chen, J. Shen, W. Wu, F. Li, Y. Wang, and Z. Liu, “Low-Cycle Fatigue Behavior of Magnesium Alloy AZ91,” Materials Science Forum, vol. 488–489, pp. 725–728, 2005.
G. Eisenmeier, B. Holzwarth, H. Hoppel, and H. Mughrabi, “Cyclic deformation and fatigue behaviour of the magnesium alloy AZ91,” Materials Science and Engineering A, vol. 319–321, pp. 578–582, Dec. 2001.
H. El Kadiri, M. Horstemeyer, J. Jordon, and Y. Xue, “Fatigue Crack Growth Mechanisms in High-Pressure Die-Cast Magnesium Alloys,” Metallurgical and Materials Transactions A, vol. 39, pp. 190–205, Jan. 2008.
D. L. Goodenberger and R. I. Stephens, “Fatigue of AZ91E-T6 Cast Magnesium Alloy,” Journal of Engineering Materials and Technology, vol. 115, no. 4, p. 391, 1993.
F. Li, Y. Wang, L. Chen, Z. Liu, and J. Zhou, “Low-cycle fatigue behavior of two magnesium alloys,” Journal of Materials Science, vol. 40, pp. 1529–1531, Mar. 2005.
ASTM B661–06, “Standard practice for heat treatment of magnesium alloys,” ASTM, 2006.
ASTM E606–04, “Standard practice for strain-controlled fatigue testing,” ASTM, 2005.
R. W. Landgraf, J. Morrow, and T. Endo, “Determination of the Cyclic Stress-Strain Curve,” Journal of Materials, vol. 4, no. 1, pp. 176–188, 1969.
ASTM El 12–96, “Standard test methods for determining average grain size,” ASTM, 2006.
J. P. Li, G. W. Lorimer, J. D. Robson, and B. Davis, “The Microstructures of As-Cast Mg-Zr and Mg-Mn Alloys,” Materials Science Forum, vol. 488–489, pp. 329–332, 2005.
H. Patel, D. Chen, S. Bhole, and K. Sadayappan, “Microstructure and tensile properties of thixomolded magnesium alloys,” Journal of Alloys and Compounds, vol. 496, pp. 140–148, Apr. 2010.
M. Horstemeyer, “High cycle fatigue of a die cast AZ91E-T4 magnesium alloy,” Acta Materialia, vol. 52, pp. 1327–1336, Mar. 2004.
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© 2011 TMS (The Minerals, Metals & Materials Society)
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Bernard, J.D., Jordon, J.B., Horstemeyer, M.F. (2011). Small Fatigue Crack Growth Observations in an Extruded Magnesium Alloy. In: Sillekens, W.H., Agnew, S.R., Neelameggham, N.R., Mathaudhu, S.N. (eds) Magnesium Technology 2011. Springer, Cham. https://doi.org/10.1007/978-3-319-48223-1_15
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DOI: https://doi.org/10.1007/978-3-319-48223-1_15
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