Strain-Hardening and Fracture Behavior of Die Cast Magnesium Alloy AM50

Sun, Zhizhong; Zhou, Ming; Hu, Henry; Li, Naiyi

doi:https://doi.org/10.1155/2007/64195

Advances in Materials Science and Engineering

On this page

Abstract References Copyright Related Articles

Research Letter | Open Access

Volume 2007 | Article ID 064195 | https://doi.org/10.1155/2007/64195

Strain-Hardening and Fracture Behavior of Die Cast Magnesium Alloy AM50

Zhizhong Sun,¹Ming Zhou,¹Henry Hu,¹and Naiyi Li²

Academic Editor: Kwai S. Chan

Received11 Jul 2007

Accepted28 Oct 2007

Published29 Nov 2007

Abstract

Understanding tensile and fracture behaviors of die cast magnesium alloys is of importance for proper design of various emerging automotive applications. In the present study, magnesium alloy AM50 was high pressure die cast into rectangular coupons with section thicknesses of 2, 6, and 10 mm. Effect of section thicknesses on strain-hardening and fracture behaviors of the die cast AM50 was investigated. The results of tensile testing indicate that the tensile properties including yield strength (YS), ultimate tensile strength (UTS), and elongation (Ef) decrease with increasing section thicknesses of die cast AM50. The analysis of true stress versus strain curves shows that the straining hardening rates during the plastic deformation of the alloy increase with decreasing section thicknesses. The observation via SEM fractography illustrates that the fracture behavior of die cast AM50 is influenced by section thicknesses. As the section thickness increases, the fracture of AM50 tends to transit from ductile to brittle mode due to increasing porosity content and coarsening microstructure.

References

B. R. Powell, V. Rezhets, M. P. Balogh, and R. A. Waldo, “Microstructure and creep behavior in AE42 magnesium die-casting alloy,” Journal of the Electrochemical Society, vol. 54, no. 8, pp. 34–38, 2002.
View at: Publisher Site | Google Scholar
M. Zhou, N. Li, and H. Hu, “Effect of section thicknesses on tensile behavior and microstructure of high pressure die cast magnesium alloy AM50,” Materials Science Forum, vol. 475–479, part 1, pp. 463–468, 2005.
View at: Google Scholar
H. T. Gjestland, S. Sannes, H. Westengen, and D. Albright, “Effects of casting temperature, section thickness and die filling sequence on microstructure and mechanical properties of high pressure die castings,” 2003, NADCA Transactions, Indianapolis, Ind, USA, T03–036.
View at: Google Scholar
M. Zhou, An experimental study of die and squeeze cast Mg alloy. AM50, M.S. thesis, University of Windsor, Windsor, Ontario, Canada, 2004.
D. Rodrigo, M. Murray, H. Mao et al., “Effects of section size and microstructural features on the mechanical properties of die-cast Az91d and Am60b magnesium alloy test bars,” 1999, SAE Technical Paper, no. 1999-01-0927.
View at: Google Scholar
G. Schindelbacher and R. Rosch, “Mechanical properties of magnesium die-casting alloys at elevated temperatures and microstructure in dependence of wall thickness,” 1998, Magnesium Alloys and Their Applications, Werkstoff-Informationsgesellschaft mbH, 247–252.
View at: Google Scholar
T. Abbott, M. Easton, and W. Song, “Mechanical behaviour of cast magnesium alloys,” Materials Science Forum, vol. 419–422, part 1, pp. 141–146, 2003.
View at: Google Scholar
W. Sequeira, The microstructure and mechanical properties of high pressure diecast magnesium alloy AZ91D, M.S. thesis, The University of Queensland, Brisbane, Australia, 2000.
J. H. Hollomon, “Tensile deformation,” Transactions of the American Institute of Mining and Metallurgical Engineers, vol. 162, pp. 268–275, 1945.
View at: Google Scholar
R. M. Wang, A. Eliezer, and E. M. Gutman, “An investigation on the microstructure of an AM50 magnesium alloy,” Materials Science and Engineering A, vol. 355, no. 1-2, pp. 201–207, 2003.
View at: Publisher Site | Google Scholar
A. Luo, H. Hu, and S. H. J. Lo, “Microstructure and mechanical properties of squeeze cast AZ91D magnesium alloy,” 1996, Light Metals Symposium, CIM, Montreal, QC, Canada, 375–387.
View at: Google Scholar

Copyright

Copyright © 2007 Zhizhong Sun et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

PDF Download Citation Order printed copies

Views

574

Downloads

2228

Citations