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Three-Dimensional Microstructure Reconstruction and Finite Element Simulation of Gas Pores in the High-Pressure Die-Casting AZ91 Mg Alloy

Published online by Cambridge University Press:  11 September 2015

Wei Jiang ,
Zhanyi Cao ,
Xu Sun  and
Haifeng Liu
Wei Jiang
Affiliation:
Key Laboratory of Automobile Materials, Department of Materials Science and Engineering, Ministry of Education, Jilin University, Changchun, Jilin 130025, China
Zhanyi Cao*
Affiliation:
Key Laboratory of Automobile Materials, Department of Materials Science and Engineering, Ministry of Education, Jilin University, Changchun, Jilin 130025, China
Xu Sun
Affiliation:
Key Laboratory of Automobile Materials, Department of Materials Science and Engineering, Ministry of Education, Jilin University, Changchun, Jilin 130025, China
Haifeng Liu
Affiliation:
FAW Foundry Co., Ltd., Heping Street, Changchun, Jilin 130062, China
*
*Corresponding author. [email protected]
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Abstract

High-pressure die-casting (HPDC) AZ91 tensile specimens were used to investigate characteristics of gas pores and their effects on mechanical properties of HPDC AZ91 magnesium (Mg) alloy. Combining the stereoscopic morphology of gas pores obtained from a three-dimensional (3D) reconstruction technique with the experimental data from uniaxial tensile testing, we worked on finite element simulation to find the relationship between gas pores and the mechanical properties of HPDC AZ91 Mg alloy. Results indicate that the 2D metallography images have one-sidedness. Moreover, gas pores >100 µm in the center region have a remarkable negative influence on the ultimate tensile strength (UTS) and elongation. With an increase in the size of large gas pores in the center region, the UTS and elongation of the material decreases. In addition, the distribution of gas pores in the specimens and the areal fraction of gas pores >100 µm on cross sections can also affect the UTS and elongation to some extent.

Keywords

three-dimensional reconstructionfinite element methodmagnesium alloymechanical characterization
Type
Materials Applications and Techniques
Information
Microscopy and Microanalysis , Volume 21 , Issue 6 , December 2015 , pp. 1420 - 1425
Copyright
© Microscopy Society of America 2015 

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References

Balasundaram, A. & Gokhale, A.M. (2001). Quantitative characterization of spatial arrangement of shrinkage and gas (air) pores in cast magnesium alloys. Mater Charact 46, 419–426.Google Scholar
Biswas, S., Sket, F., Chiumenti, M., Gutiérrez-Urrutia, I., Molina-Aldareguía, J.M. & Pérez-Prado, M.T. (2013). Relationship between the 3D porosity and β-phase distributions and the mechanical properties of a high pressure die cast AZ91 Mg alloy. Metall Mater Trans A 44, 4391–4403.Google Scholar
Cáceres, C.H. (1995). On the effect of macroporosity on the tensile properties of the Al-7%Si-0.4%Mg casting alloy. Scripta Mater 32, 1851–1856.Google Scholar
Cáceres, C.H., Griffiths, J.R., Pakdel, A.R. & Davidson, C.J. (2005). Microhardness mapping and the hardness-yield strength relationship in high-pressure diecast magnesium alloy AZ91. Mater Sci Eng A 402, 258–268.Google Scholar
Cáceres, C.H. & Selling, B.I. (1996). Casting defects and the tensile properties of an Alsingle bond Si single bond Mg alloy. Mater Sci Eng A 220, 109–166.CrossRefGoogle Scholar
Laukli, H.I., Gourlay, C.M. & Dahle, A.K. (2005). Migration of crystals during the filling of semi-solid castings. Metall Mater Trans A 36, 805–818.Google Scholar
Lee, C.D. (2007a). Tensile properties of high-pressure die-cast AM60 and AZ91 magnesium alloys on microporosity variation. J Mater Sci 42, 10032–10039.Google Scholar
Lee, C.D. (2007b). Dependence of tensile properties of AM60 magnesium alloy on microporosity and grain size. Mater Sci Eng A 454–455, 575–580.CrossRefGoogle Scholar
Lee, S.G. & Gokhale, A.M. (2006). Formation of gas induced shrinkage porosity in Mg-alloy high-pressure die-castings. Scripta Mater 55, 387–390.Google Scholar
Lee, S.G., Gokhale, A.M., Patel, G.R. & Evans, M. (2006a). Effect of process parameters on porosity distributions in high-pressure die-cast AM50 Mg-alloy. Mater Sci Eng A 427, 99–111.Google Scholar
Lee, S.G., Gokhale, A.M. & Sreeranganathan, A. (2006b). Reconstruction and visualization of complex 3D pore morphologies in a high-pressure die-cast magnesium alloy. Mater Sci Eng A 427, 92–98.CrossRefGoogle Scholar
Lee, S.G., Patel, G.R., Gokhale, A.M., Sreeranganthan, A. & Horstemeyer, M.F. (2005). Variability in the tensile ductility of high-pressure die-cast AM50 Mg-alloy. Scripta Mater 53, 851–856.Google Scholar
Shan, Z.H. & Gokhale, A.M. (2003). Utility of micro-indentation technique for characterization of the constitutive behavior of skin and interior microstructures of die-cast magnesium alloys. Mater Sci Eng A 361, 267–274.Google Scholar
Sun, X., Choi, K.S. & Li, D.S. (2013). Predicting the influence of pore characteristics on ductility of thin-walled high pressure die casting magnesium. Mater Sci Eng A 572, 45–55.Google Scholar
Weiler, J.P. & Wood, J.T. (2009). Modeling fracture properties in a die-cast AM60B magnesium alloy I—Analytical failure model. Mater Sci Eng A 527, 25–31.CrossRefGoogle Scholar
Weiler, J.P., Wood, J.T., Klassen, R.J., Maire, E., Berkmortel, R. & Wang, G. (2005). Relationship between internal porosity and fracture strength of die-cast magnesium AM60B alloy. Mater Sci Eng A 395, 315–322.Google Scholar
Wu, M.W. & Xiong, S.M. (2011). Microstructure characteristics of the eutectics of die cast AM60B magnesium alloy. J Mater Sci Technol 27(12), 1150–1156.Google Scholar