Investigation of Strengthen Phase Mg2Si Growth Mechanism on Al -20Si Alloy In-situ Synthesis Composites
Kai Xu, Shu-Quan Zhang, Xu Shen
Available Online March 2017.
- https://doi.org/10.2991/ifmca-16.2017.107How to use a DOI?
- Al -20Si alloy; in-situ synthesis composites; Mg2Si; growth mechanism
- Al-20Si alloy in-situ synthesis composites were prepared by using in-situ synthesis technique. By means of the German ZEISS Axioskop2 optical micrograph, the microstructures of Al-20Si alloy in-situ synthesis composites were investigated. The evolvement rule of Mg2Si microstructure was analyzed. The growth mechanism of Mg2Si was studied. The results indicate that Al-20Si alloy in-situ synthesis composites are prepared successfully when the certain contents of magnesium are added in Al-20Si alloy melt. The morphology of primary Mg2Si is the coarse block and eutectic Mg2Si begin to appear which the morphology is the Chinese characters-like shape or stripe ones when the content of magnesium is 8%. While the coarse block of Mg2Si decrease, and the morphology of Mg2Si is Chinese characters-like shape, dendritic shape and fishbone shape with 6% magnesium. In the process of Mg2Si growth, Mg2Si push out more aluminum to solid-liquid interface, so the redistribution of solute elements happens in solid-liquid interface. The equilibrium structure of interface is that of the minimum free energy. Mg2Si growth mechanism is in conformity with the interfacial energy minimum principle.
- Open Access
- This is an open access article distributed under the CC BY-NC license.
Cite this article
TY - CONF AU - Kai Xu AU - Shu-Quan Zhang AU - Xu Shen PY - 2017/03 DA - 2017/03 TI - Investigation of Strengthen Phase Mg2Si Growth Mechanism on Al -20Si Alloy In-situ Synthesis Composites BT - Proceedings of the 2016 International Forum on Mechanical, Control and Automation (IFMCA 2016) PB - Atlantis Press SP - 681 EP - 688 SN - 2352-5401 UR - https://doi.org/10.2991/ifmca-16.2017.107 DO - https://doi.org/10.2991/ifmca-16.2017.107 ID - Xu2017/03 ER -