Effects of Different Species of Sr Additives on as Cast Microstructure and Tensile Properties of AS31 Alloy

Zhou, Ji Xue; Wang, Jin Wei; Zhang, Yi; Tang, Shou Qiu; Li, Wei Hong; Yang, Yuansheng

doi:10.4028/www.scientific.net/msf.816.465

Cited by 1 publication

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“…However, the course grain and Chinese script Mg 2 Si particles were detrimental to tensile properties of the alloy. It had been found that Sr was effective on the refinement of grains and modification of Mg 2 Si [4][5][6]. The common alloys in this series are AS21, AS31 and AS41.…”

Section: Introductionmentioning

confidence: 96%

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

Ma¹,

Wang²,

Zhou³

et al. 2015

Proceedings of the 3rd International Conference on Advances in Energy and Environmental Science 2015

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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 Mg 2 Si particles and β-Mg 17 Al 12 divorced eutectic phase appeared in the interdendritic area in Mg-3Al-1Si-0.5Sr alloys. With the increase of Al content, more and more β-Mg 17 Al 12 divorced eutectic phase appear in semi-continuous distribution. The lamellar-like shape β-Mg 17 Al 12 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.

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Section: Introductionmentioning

confidence: 96%