Effects of different Al contents on as-cast microstructure and properties of Mg-Al-Si-Sr alloy

DOI

10.2991/icaees-15.2015.44How to use a DOI?

Keywords

Mg-Al-Si-Sr alloy, Al content, microstructure, tensile properties, hardness

Abstract

Effects of different Al additions (3wt.%, 5wt.%, 7wt.%, 9wt.% Al) on as-cast microstructure and properties of Mg-Al-1Si-0.5Sr alloy were studied. The average grain size decreases and then increases with the increasing of Al additions. There are polyhedral shape, fine fibers shape, a few Chinese script Mg2Si particles and -Mg17Al12 divorced eutectic phase appeared in the interdendritic area in Mg-3Al-1Si-0.5Sr alloys. With the increase of Al content, more and more -Mg17Al12 divorced eutectic phase appear in semi-continuous distribution. The lamellar-like shape -Mg17Al12 secondary-precipitated phase emerge with Al addition of 5wt.%, 7wt.% and 9wt.%. The optimum tensile properties of Mg-7Al-1Si-0.5Sr alloy can be obtained, where the ultimate strength, yield strength and elongation are 201.1MPa, 160.7MPa, 4.8% at ambient temperature and 164.5MPa, 128.0MPa, 7.4% at 150°C respectively. The hardness increased with the increasing of Al content.

Copyright

© 2015, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Baichang Ma
AU  - Jinwei Wang
AU  - Jixue Zhou
AU  - Yunteng Liu
AU  - Dongqing Zhao
AU  - Linlin Zhang
AU  - Shouqiu Tang
AU  - Yuansheng Yang
PY  - 2015/07
DA  - 2015/07
TI  - Effects of different Al contents on as-cast microstructure and properties of Mg-Al-Si-Sr alloy
BT  - Proceedings of the 3rd International Conference on Advances in Energy and Environmental Science 2015
PB  - Atlantis Press
SP  - 239
EP  - 243
SN  - 2352-5401
UR  - https://doi.org/10.2991/icaees-15.2015.44
DO  - 10.2991/icaees-15.2015.44
ID  - Ma2015/07
ER  -