Proceedings of the 2016 International Forum on Mechanical, Control and Automation (IFMCA 2016)

Investigation of Strengthen Phase Mg2Si Growth Mechanism on Al -20Si Alloy In-situ Synthesis Composites

Authors
Kai Xu, Shu-Quan Zhang, Xu Shen
Corresponding Author
Kai Xu
Available Online March 2017.
DOI
https://doi.org/10.2991/ifmca-16.2017.107How to use a DOI?
Keywords
Al -20Si alloy; in-situ synthesis composites; Mg2Si; growth mechanism
Abstract
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.
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Volume Title
Proceedings of the 2016 International Forum on Mechanical, Control and Automation (IFMCA 2016)
Series
Advances in Engineering Research
Publication Date
March 2017
ISBN
978-94-6252-307-4
ISSN
2352-5401
DOI
https://doi.org/10.2991/ifmca-16.2017.107How to use a DOI?
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  -