Effect of Melt Treatment on Fe-Rich Phase in Al–25Si–2Fe–2Mn Alloy
The Al–25Si–2Fe–2Mn alloy melt was treated by using electromagnetic stirring, cooling slope and spray deposition technologies, respectively. By using various methods including SEM, EDS, XED and TEM, the solidification microstructure of Al–25Si–2Fe–2Mn alloys and the separation behavior and crystal structure of Fe-rich phase under different treatment modes of melts were analyzed. The result showed that under the three treatment modes, the hard phases in the microstructure of Al–25Si–2Fe–2Mn were all refined at different degrees. Among them, spray deposition yielded had the best refining effect, where the primary Si with the average diameter of about 5 μm were shown as tiny particles while granular Fe-rich phases with the average diameter of about 7 μm were dispersed into the microstructure. For the microstructure treated by cooling slope, the primary Si particles and the blocky Fe-rich phase exhibited the average diameters of about 30 and 40 μm, respectively and some Fe-rich phases were centered on the primary Si particles. In comparison, the electromagnetic stirring presented the worst refining effect. The primary Si particles, mainly appeared as blocks, showed an average diameter of about 50 μm and the blocky Fe-rich phase exhibited an average diameter of about 30 μm. In addition, some Fe-rich phases were bonded with the primary Si particles to distributed in the neighbor of latter. When the two materials were regarded as a whole, the average diameter were measured to be about 100 μm. Fe-rich phases treated by using the three treatment modes of melts were all stable α-Al15(Fe,Mn)3Si2 phases, but their in the alloys undergoing different treatments shows significantly different morphologies and distributions.
KeywordsElectromagnetic stirring Cooling slope Hypereutectic Al–Si alloys Fe-rich phase Crystal structure
The authors acknowledge funding for the research from National Science Foundation of China (51505205) and (E050802), Science and Technology Project Foundation of Yunnan Province of China (KKZ3201532005). This work is supported by the Advanced Solidification forming and Equipment Technology National Joint Local Engineering Laboratory, Kunming University of Science and Technology, Kunming, China.
- 1.W. Zhang, F. Yang, W.P. Gan et al., Study of the hot deformation behavior of the Al-35Si high silicon aluminum alloy. J. Mater. Rev. 19, 136–138 (2005)Google Scholar
- 4.B.Q. Chen, J.B. Peng, E. Miao, The influence of Mn on Fe-phase aspect in Al-Si alloy. J. Wuhan Univ. Technol. 26, 485–487 (2002)Google Scholar
- 5.X.M. Fan, J.F. Liu, H.Y. Wen, Effects of manganese on the morphology of iron phase and mechanical properties of Al-Si alloy with high Fe content. J. Spec. Cast. Nonferrous Alloys. 28, 594–596 (2008)Google Scholar
- 6.Y. Jia, P. Zhao, Effects of Al-Si-Mn-Fe Phase in hypereutectic Al-Si alloy. J. ChengDu. Univ. Technol. 28, 214 (2001)Google Scholar
- 8.L.G. Hou, H. Cui, Y.H. Cai, J.S. Zhang, Microstructures and phase formation of cast and spray-formed Al-25Si-5Fe-3Cu alloys. J. Univ. Sci. Technol. B. 31, 1006–1012 (2009)Google Scholar
- 13.H.J. Hung, J.S. Zhang, H. Feng, Effect of Mn on Fe phases in spray-deposited Al-25Si-xFe-yMn alloys. J. Univ. Sci. Technol. B. 32, 219–233 (2010)Google Scholar
- 14.H.J. Hung, H. Feng, J.S. Zhang, Solidification structure of cast Al-25Si-xFe-yMn alloy. J. Spec. Cast. Nonferrous Alloys. 30, 766–769 (2010)Google Scholar