|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||Effect of Ni Addition on the Solidification Process and Microstructure of Al-12%Si-4%Cu-1.2%Mn-x%Ni Heat-resistant Alloys
||Hengcheng Liao, Qu Liu, Guangjin Li, Uday S. Dixit
|On-Site Speaker (Planned)
Based on PandatTM phase diagram simulation calculation and microstructure observation by optical microscope and SEM-EDS, the effect of Ni addition in Al-12%Si-4%Cu-1.2%Mn-x%Ni(in wt.%)(x=0, 0.8, 2.0, 2.4, 3.4) heat-resistant alloys on solidification process and microstructure is discussed in this study. Microstructure observation are in good consistence with the prediction from simulation calculation, except for the constituent of Ni-rich phase. Ni addition considerably changes the solidification course, not only enlarging the crystallization temperature range of the primary Al15Mn3Si2 phase(the main strengthening phase in heat-resistance) but also completely suppress the two-phases eutectic reaction when Ni content is beyond 2wt.%. It also results in an increase in the amount of the primary Al15Mn3Si2 phase and 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.
||Planned: Light Metals