Abstract
This work is aimed to conclude the effect of section thickness, position and long term annealing (LTA) on the microstructure and its influences on the tensile properties such as yield strength (YS), ultimate tensile strength (UTS), ductility and fracture strain (FS) of high pressure die cast (hpdc) AZ91 Mg alloy. The variations in tensile properties with respect to different castings are explained using the microstructural quantities; average size, area fraction, number density and clustering tendency (CT) of microporosity, massive (βm) continuous (βc) and discontinuous (βd) Mg17Al12 particles, and grain size. Evidence of different micro failure modes of the material are presented to explain the influence of different micro features on failure. The extend effects of shrinkage porosity and β(βm,βc and βd) particles on the deformation and failure of the material are discussed.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Mordike, B.L., Ebert, T.: Magnesium properties-applications-potential. Mater. Sci. Eng. A 302, 37–45 (2001)
Bowles, A.L., Bastow, T.J., Davidson, C.J., et al.: The effect of low-temperature ageing on the tensile properties of high-pressure die-cast Mg-Al alloys. In: Magnesium Technology 2000, The Minerals, Metals and Materials Society, Nashville, USA, pp. 295–300 (2000)
Schindelbacher, G., Rösch, R.: Mechanical properties of magnesium die casting alloys at elevated temperatures and microstructure independence of wall thickness. In: Mordike, B.L., Kainer, K.U. (eds.) Magnesium alloys and their applications, Wolfsburg, Germany, pp. 247–252 (1998)
Sequeira, W.P., Dunlop, G.L.: Effect of section thickness and microstructure on the me-chanical properties of high pressure die cast magnesium alloy AZ91D. In: Proceedings of the 3rd International magnesium conference, Institute of materials, Manchester, pp. 63–73 (1996)
Orchan, W.L., Gruzleski, J.E.: Grain refinement, modification and melt hydrogen-their effects on microporosity, shrinkage and impact properties in A356 alloy. Trans. Am. Foundry Soc. 100, 415–424 (1992)
Couture, A., Meier, J.W.: The effect of wall thickness on the tensile properties of Mg-Al-Zn castings. Trans. Am. Foundry Soc. 74, 164–173 (1966)
Rodrigo, D., Murray, M., Mao, H., et al.: Effects of section size and microstructural features on the mechanical properties of die cast AZ91D and AM60B magnesium alloy test bars. In: SAE International congress and exposition, SAE International, Detroit, USA, pp. 785–789 (1999); Paper No.1999-01-0927
Stich, A., Haldenwanger, H.G.: Dimension strategy for high-stress cast magnesium components. In: Magnesium 2000, 2nd International conference on magnesium science and technology, Dead Sea, Israel, pp. 27–34 (2000)
Suman, C.: Heat treatment of magnesium die casting alloys AZ91D and AM60B. In: SAE International congress and exhibition, SAE technical paper series, Paper no. 890207 (1989)
Basner, T.G., Evans, M., Sakkinen, D.J.: The effect of extended time aging on the me-chanical properties of vertical vacuum cast aluminium-manganese and aluminium-rare earth magnesium alloys. In: Magnesium properties and applications for automobiles, society of automotive engineers, Detroit, USA, pp. 59–64 (1993)
Sakkinen, D.J., Evans, M.: The effect of aging on magnesium die casting alloys. In: Proceedings of the 17th International die casting congress and exposition, Cleveland, USA, pp. 305–313 (1993)
Song, G., Bowles, A.L., StJohn, D.H.: Corrosion resistance of aged die cast magnesium alloy AZ91D. Mater. Sci. Eng. A 366, 74–86 (2004)
Leo Prakash, D.G., Regener, D., Vorster, W.J.J.: Effect of long term annealing on the microstructure of hpdc AZ91 Mg alloy: A quantitative analysis by image processing. Comput. Mater. Sci. (2008) doi:10.1016/j.commatsci.2008.01.040
Leo Prakash, D.G., Regener, D.: 2D quantitative characterization of microstructural in-homogeneities in the pressure die cast AZ91 magnesium alloy. Prakt. Metallogr. 42, 555–575 (2005)
Anson, J.P., Gruzleski, J.E.: The quantitative discrimination between shrinkage and gas microporosity in cast aluminum alloys using spatial data analysis. Mater. Charact. 43, 319–335 (1999)
Anson, J.P., Gruzleski, J.E.: Effect of hydrogen content on the relative amounts of shrinkage and gas microporosity in a cast Al-7% Si foundry alloy. Trans. Am. Foundry. Soc 107, 135–142 (1999)
Baudhuin, P., Leroy-Houyet, M.A., Quintart, J., et al.: Application of cluster analysis for characterization of spatial distribution of particles by stereological methods. J. Microsc. 115, 1–17 (1979)
Leo Prakash, D.G., Regener, D.: Quantitative characterization of Mg17Al12 phase and grain size in HPDC AZ91 magnesium alloy. J. Alloys Compd. (2007) doi:10.1016/j.jallcom.2007.07.017
Form, G.W., Ahearn, P.J., Wallace, F.J.: Mass effect on castings tensile properties. Trans Amer. Foundarymen’s Soc. 67, 64–69 (1959)
Starink, M.J.: Kinetic equations for diffusion-controlled precipitation reactions. J. Mater. Sci. 32, 4061–4070 (1997)
Celotto, S.: TEM study of continuous precipitation in Mg-9%Al-I%Zn alloy. Acta Mater. 48, 1775–1787 (2000)
Leo Prakash, D.G., Regener, D., Vorster, W.J.J.: Microscopic failure modes of hpdc AZ91HP Magnesium alloy under monotonic loading. Mater. Sci. Eng. A (2007) doi:10.1016/j.msea.2007.11.011
Regener, D., Schick, E., Wagner, I., et al.: Strength and deformation behaviour of magnesium die casting alloys. Materialwiss. Werkst. 30, 525–532 (1999)
Yoo, M.S., Kim, Y.C., Ahn, S., et al.: Tensile and creep properties of squeeze cast Mg alloys with various second phases. Mater. Sci. Forum, 419–424 (2003)
Weiler, J.P., Wood, J.T., Klassen, R.J., et al.: Relationship between internal porosity and fracture strength of diecast magnesium AM60B alloy. Mater. Sci. Eng. A 419, 297–305 (2006)
Westengen, H., Wei, L.Y., Aune, T., et al.: Effect of intermediate temperature aging on mechanical properties and microstructure of die cast AM alloys. In: Mordike, B.L., Kainer, K.U. (eds.) Magnesium alloys and their applications, Wolfsburg, Germany, pp. 209–214 (1998)
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2008 Springer-Verlag Berlin Heidelberg
About this chapter
Cite this chapter
Prakash, D.G.L., Regener, D. (2008). Microstructural Influences on Tensile Properties of hpdc AZ91 Mg Alloy. In: Bertram, A., Tomas, J. (eds) Micro-Macro-interaction. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-85715-0_2
Download citation
DOI: https://doi.org/10.1007/978-3-540-85715-0_2
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-85714-3
Online ISBN: 978-3-540-85715-0
eBook Packages: EngineeringEngineering (R0)