Abstract
The recognised potential of rare earth (RE) additions such as cerium (Ce) and lanthanum (La) for strengthening aluminum alloys has led to an area of research focused on the development of new alloys, targeting powertrain applications that require high temperature strength and creep resistance. In an attempt to further improve the mechanical properties of the Al–Si system, this paper addresses the effects that RE additions have on the microstructure and phase evolution during solidification. This study presents the results of in situ solidification studies using neutron diffraction and microstructural analyses using scanning electron microscopy with energy-dispersive spectroscopy of Al7Si3.5RE and Al18Si8RE alloys, where numerical notation indicates composition in wt%. We find that the RE additions lead to the formation of globular Al20Ti2(Ce6LaNd) and rod-like Si3Al2(Ce 3La2Nd) intermetallics in the Al7Si3.5RE alloy. We also find that Si and Cu additions in the Al18Si8RE alloy transforms the solid structure of the rod-like Si3Al2(Ce 3La2Nd) intermetallic to a fibrous twin-layered material comprised of alternating Si3Ce1Al1(La6Nd3Cu2Pr) and Al5Si4CeCu(La6Nd3Pr) constituents. Furthermore, the high RE content in the Al18Si8RE alloy leads to a prolonged solidification range which may increase the alloy’s susceptibility to porosity formation.
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References
Stroh J, Piche A, Sediako D, Lombardi A, and Byczynski G (2019) The Effects of Solidification Cooling Rates on the Mechanical Properties of an A319 Inline-6 Engine Block, The Minerals, Metals & Materials Society (TMS), vol. Light Metals: 505–512.
Vandersluis E, Lombardi A, Ravindran C, Bois-Brochu A, Chiesa F, and MacKay R (2015) Factors influencing thermal conductivity and mechanical properties in 319 Al alloy cylinder heads. Mater. Sci. Eng. A, 648: 401–411.
Kasprzak W, Sahoo M, Sokolowski J, Yamagata H, and Kurita H (2009) The Effect of the Melt Temperature and the Cooling Rate on the Microstructure of the Al-20%Si Alloy Used for Monolithic Engine Blocks, International Journal of Metal Casting 3(3):55–71.
Yamagata H, Kurita H, Aniolek M, Kasprzak W, and Sokolowski J (2007) Thermal and metallographic characteristics of the Al-20% Si high-pressure die-casting alloy for monolithic cylinder blocks, Journal of Materials Processing Technology 199(2008):84–90.
YU W, YUAN A, GUO Z, and XIONG S (2017) Characterization of A390 aluminum alloy produced at different slow shot speeds using vacuum assisted high pressure die casting Trans. Nonferrous Met. Soc. 27(2017):2529–2538.
Bogdanoff T, Dahle A, and Seifeddine S (2018) Effect of Co and Ni Addition on the Microstructure and Mechanical Properties at Room and Elevated Temperature of an Al–7%Si Alloy, International Journal of Metal Casting 12(3):434–440.
Sediako D, Kasprzak W, Swainson I, and Garlea O (2011) Solidification Analysis of Al-Si Alloys Modified with Addition of Cu Using In-Situ Neutron Diffraction, The Minerals, Metals & Materials Society (TMS) 2(Materials Fabrication, Properties, Characterization, and Modeling):279–289.
Liu W, Xiao W, Xu C, Liu M, and Ma C (2017) Synergistic Effects of Gd and Zr on Grain Refinement and Eutectic Si Modification of Al-Si Cast Alloy, Material Science and Engineering A 693(2017):93–100.
Xu C, Xiao W, Hanada S, Yamagata H, and Ma C (2015) The effect of scandium addition on microstructure and mechanical properties of Al-Si-Mg alloy: A multi-refinement modifier, Materials Characterization, 110(2015):160–169.
Samuel A, Doty H, Valtierra S, and Samuel F (2014) Effect of grain refining and Sr-modification interactions on the impact toughness of Al-Si-Mg cast alloys, Materials and Design 56(2014):264–273.
Elgallad E, Ibrahim M, Doty H, and Samuel F (2018) Microstructural characterisation of Al-Si cast alloys containing rare earth additions Microstructural characterisation of Al-Si cast alloys containing rare earth additions, Philosophical Magazine 98(15):1337–1359.
Samuel A, Samuel F, Doty H and Valtierra S (2017) Porosity formation in Al-Si sand mold castings, International Journal of Metal Casting 11(4):812–822.
Mahmoud M, Elgallad E, Ibrahim M, and Samuel F (2018) Effect of Rare Earth Metals on Porosity Formation in A356 Alloy, International Journal of Metal Casting 12(2):251–265.
Sims Z, Weiss D et al. (2016) Cerium-Based, Intermetallic-Strengthened Aluminum Casting Alloy: High-Volume Co-product Development, JOM 68(7):1940–1947.
Weiss D (2017) Development and Casting of High Cerium Content Aluminum Alloys, Modern Casting 107(12):35–38.
ASTM (009) E8M Standard Test Methods for Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products, ASTM B 1–16.
ASTM (2001) E3-11 Standard Guide for Preparation of Metallographic Specimens 1, ASTM 1–12.
Liss K, Hunter B, Hagen M, Noakes T, and Kennedy S (2006) Echidna-the new high-resolution powder diffractometer being built at OPAL, Phys. B: Condensed Matter 385–386: 1010–1012.
Cooper A (1962) Precise lattice constants of germanium, aluminum, gallium arsenide, uranium, sulphur, quartz and sapphire, Acta Crystallographica 15(6):578–582.
Többens D, Stüßer N, Knorr K, Mayer H, and Lampert G (2001) E9: The New High-Resolution Neutron Powder Diffractometer at the Berlin Neutron Scattering Center, Mater. Sci. Forum 378–381:288–293.
Karlsruhe F (2018) Inorganic Crystals Structures Database, Leibniz Institute for Information Infrastructure [Online]. Available: https://icsd.fiz-karlsruhe.de/search/index.xhtml;jsessionid=BDB6DC046A694F77D5D5C443909832EF.
Kasprzak W, Sediako D, Walker M, Sahoo M, and Swainson I (2010) Characterization of hypereutectic Al-19% Si alloy solidification process using in-situ neutron diffraction and thermal analysis techniques, Light Metals 2010(Advances in Materials and Processes):121–132.
Kasprzak W, Sediako D, Walker M, Sahoo M, and Swainson I (2011) Solidification analysis of an Al-19 Pct Si alloy using in-situ neutron diffraction, Metall. Mater. Trans. A 42(7):1854–1862.
Stroh J, Davis T, McDougall A, and Sediako D (2018) In Situ Study of Solidification Kinetics of Al–Cu and Al–Ce–Mg Alloys with Application of Neutron Diffraction, The Minerals, Metals & Materials Society (TMS) Light Metals 2018:1059–1065.
Sediako D and Kasprzak W (2015) In Situ Study of Microstructure Evolution in Solidification of Hypereutectic Al-Si Alloys with Application of Thermal Analysis and Neutron Diffraction, Metall. Mater. Trans. A 46(9):4160–4173.
Vandersluis E, Elsayed A, D’Elia F, Emadi P, Sediako D, and Ravindran C (2018) Crystalline-Phase Solidification Analysis Using In-Situ Neutron Diffraction, Trans. Indian Inst. Met 71(11):2777–2781.
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Stroh, J., Sediako, D., Weiss, D., Peterson, V.K. (2020). In Situ Neutron Diffraction Solidification Analyses of Rare Earth Reinforced Hypoeutectic and Hypereutectic Aluminum–Silicon Alloys. In: Tomsett, A. (eds) Light Metals 2020. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-36408-3_24
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