Effect of Cooling Rate on β-Al5FeSi and Eutectic Silicon Morphologies in Al-Si-Fe Cast Alloys by Adding Al-5%Cr-3%Mn-1%Sr Master Alloy
Article Sidebar
Main Article Content
Abstract
The effects of the cooling rate and the addition of the Al-5%Cr-3%Mn-1%Sr (5Cr3Mn1Sr) master alloy on the intermetallic compound and eutectic silicon morphology in aluminum-silicon-iron (Al-Si-Fe) cast alloys were investigated. The Fe content was set to 0.5%, 1.0%, and 1.5% (wt.%). Two cooling rates were used to analyze the modification of the Al-Si-Fe cast alloys. The experimental results showed that a low cooling rate in aluminum-silicon-1.5%Fe led to the formation of the phase (
-Al5FeSi) and porosity during the solidification process. In contrast, aluminum-silicon containing 1.5% Fe treated with 4 wt% of 5Cr3Mn1Sr master alloy can change the shape of
phase to
phase (Al15(Fe,Cr,Mn)3Si2) morphology, while significantly reducing porosity size. The rapid cooling rate reduced the SDAS (Secondary dendrite arm spacing) phase and refined the eutectic Si morphology in the microstructures. The combination of the rapid cooling rate and the addition of the master alloy fully modified both the intermetallic compounds and eutectic Si, especially in the A356 and aluminum-silicon-0.5%Fe alloys. Fraction analysis revealed that the
phases in aluminum-silicon alloys with 1%Fe and 1.5%Fe, treated with master alloys, decreased to 75.80% and 55.36%, respectively. It can be concluded that the combination of the cooling rate and the addition of 5Cr3Mn1Sr master alloys can enhance the quality and modification efficiency of castings.
Article Details
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Journal of Technology and Engineering Progress is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence, unless otherwise stated. Please read our Policies page for more information
References
John L. Jorstad, Donna L. Zalensas and Wayne M. Rasmussen, American Foundrymen's Society, 1993.
Lennart Bäckerud, Guocai Chai and Jarmo Tamminen, Solidification Characteristics of Aluminum Alloys: Foundry alloys Volume 2 of Solidification Characteristics of Aluminum Alloys, Skanaluminium, 1990.
Mahta. M, Emamy, M, Cao. X and Campbell. J, “Overview of -Al5FeSi phase in Al-Si alloys,” Materials Science Research Trends, 2008, pp. 251-271.
M.H. Abdelaziz, A.M. Samuel, H.W. Doty and F.H. Samuel, “Effect of extended thermal exposure and alloying elements on the morphology of eutectic Si in Al–Si Cast Alloys,” Inter Metal cast, 2020, pp. 1013–1024.
Rui CHEN, Yu-feng SHI, Qing-yan XU and Bai-cheng LIU, “Effect of cooling rate on solidification parameters and microstructure of Al-7Si-0.3Mg -0.15Fe alloy,” Trans. Nonferrous Met. Soc. China, vol. 24, 2014, pp.1645−1652.
Qing Cai , Ewan Lordan, Shihao Wang, Guangyu Liu, Chamini L. Mendis , Isaac T.H. Chang and Shouxun Ji, “Die-cast multicomponent near-eutectic and hypoeutectic Al–Si–Ni–Fe–Mn alloys: Microstructures and mechanical properties,” Materials Science & Engineering A, vol. 872, 2023, pp. 144977.
Ossama Elsebaie, Agnes M. Samuel, F.H. Samuel and H.W. Doty, “Impact toughness of Al–Si–Cu–Mg–Fe cast alloys: Effects of minor additives and aging conditions,” Materials and Design, vol. 60, 2014, pp. 496–509.
M. AMNE ELAHI and S. G. SHABESTARI, “Effect of various melt and heat treatment conditions on impact toughness of A356 aluminum alloy,” Trans. Nonferrous Met. Soc. China, vol. 26, 2016, pp. 956−965.
Krittee eidhed and Phisith muangnoy, “Effect of cooling rates of production process of Al-3%B-3%Sr master alloy on grain refinement and eutectic modification efficiency in cast A356 alloy,” MATEC Web of Conferences, 192, 2018, pp. 01036.
D. Gagnon, A. M. Samuel, F. H. Samuel, M. H. Abdelaziz, and H. W. Doty, “Melt Treatment-Porosity Formation Relationship in Al-Si Cast Alloys, Casting Processes and Modelling of Metallic Materials. 2021.
Witthaya Eidhed, “Modification of -Al5FeSi Compound in Recycled Al-Si-Fe Cast Alloy by Using Sr, Mg and Cr Additions,” J Mater Sci Technol, vol. 24, 2008, pp. 45-47.
P. Muangnoy, “The Development of Al-10%Mn-1%Sr Master Alloy to Modify -phase and Eutectic Silicon in Cast Al-7% Si-1% Fe Alloys,” Industrial Engineering (IE) Network Conference, 2011, pp. 1255-1263.
