Abstract
By PandatTM phase diagram calculations based on Equilibrium and Scheil Models and microstructure observation by optical microscope, XRD and SEM-EDS, the effect of Ni addition in Al-12%Si-4%Cu-1.2%Mn-x%Ni heat-resistant alloys (in wt%; x = 0, 0.8, 2.0, 2.4, 3.4) on solidification process and microstructure is discussed in this study. Microstructure observation are in good consistence with the prediction from phase diagram calculation, except for the constituent of Ni-rich phase. Ni addition considerably changes the solidification process, not only enlarging the crystallization temperature range of primary Al15Mn3Si2 phase but also completely suppressing the two-phases eutectic reaction when Ni content is beyond 2 wt%. And it also results in an increase in the amount of primary Al15Mn3Si2 phase, and makes its morphology change from coarse dendrites to slender rods. In Ni1 (x = 0.8) and Ni2 (x = 2.0) alloys, fish-skeleton δ-Al3CuNi is found to be partially in coupled growth with blocky γ-Al7Cu4Ni phase, and in Ni3 (x = 2.4) and Ni4 (x = 3.4) alloy, new short-rod ε-Al3Ni is formed.
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This work is supported by Jiangsu Key Laboratory of Advanced Metallic Materials (grant number BM2007204) and the Fundamental Research Funds for the Central Universities (grant number 2242016K40011).
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Liao, H., Liu, Q., Li, G., Dixit, U.S. (2018). Effect of Ni Addition on the Solidification Process and Microstructure of Al-12%Si-4%Cu-1.2%Mn-x%Ni Heat-Resistant Alloys. In: Martin, O. (eds) Light Metals 2018. TMS 2018. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-72284-9_37
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DOI: https://doi.org/10.1007/978-3-319-72284-9_37
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