Effect of Extrusion Ratio on Microstructure and Mechanical Properties of As-Cast AZ91D Magnesium Alloy

Abstract:

In order to study the effect of deformation extent on microstructure and mechanical properties of as-cast AZ91D magnesium alloy, experiments of direct extrusion were performed at temperature of 420 and different extrusion ratios. The microstructure and mechanical properties of billets and extrudates were measured. Experimental results show that the grain size of as-cast AZ91D magnesium alloy can be dramatically refined by extrusion. Direct extrusion can obviously improve the mechanical properties of as-cast AZ91D magnesium Alloy, comparing with the pre-extruded billet, the tensile strength, yield strength and elongation of extrudate can be improved by at least 83%, 154% and 150% respectively. As the extrusion ratio increases, the tensile strength and yield strength of extrudate will increase at first and then fall.

• Periodical: Advanced Materials Research (Volume 445)
• Pages: 237-240
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.445.237
• Online since: January 2012
• Authors: Bao Hong Zhang, Zhi Min Zhang
• Keywords: As-Cast AZ91D Magnesium Alloy, Direct Extrusion, Extrusion Ratio, Mechanical Property, Microstructure

References

[1] B.T. Zi and H. Wang: Chin. J. Rare Met. Vol. 28 (2004), p.229.

[2] I.J. Polmer: Mater. Sci. Technol. Vol. 10 (1994), p.1.

[3] L.A. Dobrzanski, T. Tanski, L. Cizek and Z. Brytan: J. Mater. Process. Technol. Vol. 192-193 (2007), p.567.

[4] K. Mueller and S. Mueller: J. Mater. Process. Technol. Vol. 187-188 (2007), p.775.

[5] B.L. Mordike and T. Ebert: Mater. Sci. Eng. A Vol. 302 (2001), p.37.

[6] A. Yamashita, Z. Horita and T.G. Langdon: Mater. Sci. Eng. Vol. 300 (2001), p.142.

[7] N. Ogawa, M. Shiomi and K. Osakada: Int. J. Mach. Tools Manuf. Vol. 42 (2002), p.607.

[8] R.F. Decker: Adv. Mater. Process. Vol. 9 (1998), p.31.

[9] S.I. Wang, M.K. Seo, J.R. Cho and W.B. Bae: J. Mater. Process. Technol. Vol. 130-131 (2002), p.294.

[10] B.H. Zhang, X. Zhang, Q. Wang, Z.M. Zhang and B.C. Li: J. Mater. Eng. Vol. 5 (2005), p.45.