Abstract
Al8Mn5 is crucial for impurity control and corrosion resistance of AZ91. We study the growth morphology of primary and eutectic Al8Mn5 after the equiaxed solidification of AZ91 cooled at ~1 K/s. Primary Al8Mn5 grew as ~10 μm equiaxed faceted crystals with multiple growth facets. The eutectic Al8Mn5 grew with a complex faceted morphology ranging from rod to sheet and folded plate-like, often with growth steps on the largest facets. The results are compared with the AZ91 solidification path predicted by PanDat with the PanMg8 database.
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References
B.C. Oberlander, C.J. Simensen, J. Svalestuen, A. Thorvaldsen, Phase diagram of liquid magnesium–aluminium-manganese alloys. Magnes. Technol. 133–137 (1986)
Y. Wang, M. Xia, Z. Fan, X. Zhou, G.E. Thompson, The effect of Al8Mn5 intermetallic particles on grain size of as-cast Mg-Al-Zn AZ91D alloy. Intermetallics 18, 1683–1689 (2010)
C.J. Simensen, B.C. Oberlander, J. Svalestuen, A. Thorvaldsen, Phase diagram for magnesium-aluminium-manganese above 650 °C. Zeitschrift Fuer 79, 696–699 (1988)
C. Simensen, N. Hansen, The effect of silicon upon alloys of Mg-2. 2 wt%Al-Mn. Zeitschrift Fuer Met. 79, 541–543 (1988)
V.Y. Gertsman, J. Li, S. Xu, J.P. Thomson, M. Sahoo, Microstructure and second-phase particles in low- and high-pressure die-cast magnesium alloy AM50. Metall. Mater. Trans. A 36, 1989 (2005)
G. Han, X. Liu, Phase control and formation mechanism of Al–Mn(–Fe) intermetallic particles in Mg–Al-based alloys with FeCl3 addition or melt superheating. Acta Mater. 114, 54–66 (2016)
S. Lun Sin, D. Dubé, R. Tremblay, Characterization of Al-Mn particles in AZ91D investment castings. Mater. Charact. 58, 989–996 (2007)
A. Maltais, D. Dubé, F. Roy, M. Fiset, Optical anisotropy of a color-etched AZ91 magnesium alloy. Mater. Charact. 54, 315–326 (2005)
A. Maltais, D. Dubé, M. Fiset, G. Laroche, S. Turgeon, Improvements in the metallography of as-cast AZ91 alloy. Mater. Charact. 52, 103–119 (2004)
C.M. Gourlay, B. Meylan, A.K. Dahle, Shear mechanisms at 0–50% solid during equiaxed dendritic solidification of an AZ91 magnesium alloy. Acta Mater. 56, 3403–3413 (2008)
A.V. Nagasekhar, C.H. Cáceres, C. Kong, 3D characterization of intermetallics in a high pressure die cast Mg alloy using focused ion beam tomography. Mater. Charact. 61, 1035–1042 (2010)
W.B. Pearson, P.W. Riley, Gamma-brasses with R cells. Acta Crystallogr. Sect. B. 33, 1088 (1977)
C. Corby, N. Ricketts, M. Qian, Investigation of intermetallics in magnesium die-casting sludge. Magnes. Technol. 209–214 (2004)
M.D. Vaudin, Pseudosymmetry in EBSD patterns. Microsc. Microanal. 11, 510–511 (2005)
G. Nolze, A. Winkelmann, Progress in dynamic EBSD pattern simulation. Microsc. Microanal. 16, 62–63 (2010)
P.G. Callahan, M. De Graef, Dynamical electron backscatter diffraction patterns. Part I: pattern simulations. Microsc. Microanal. 19, 1255–1265 (2013)
G. Nolze, A. Winkelmann, A.P. Boyle, Pattern matching approach to pseudosymmetry problems in electron backscatter diffraction. Ultramicroscopy 160, 146–154 (2015)
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The research was conducted within EPSRC Future LiME Hub with grant number EP/N007638/1.
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© 2017 The Minerals, Metals & Materials Society
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Zeng, G., Xian, J.W., Gourlay, C.M. (2017). Growth of Al8Mn5 Intermetallic in AZ91. In: Solanki, K., Orlov, D., Singh, A., Neelameggham, N. (eds) Magnesium Technology 2017. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-52392-7_15
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DOI: https://doi.org/10.1007/978-3-319-52392-7_15
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