Mg、Si含量对Al-Mg-Si合金显微组织与性能的影响

doi:10.11896/cldb.18070193

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Abstract The effect of Mg and Si content with fixed Mg/Si ratio on the microstructure and properties of Al-Mg-Si alloy was investigated by mechanical properties testing, intergranular corrosion and electrochemical polarization curve, combined with SEM, EDS, TEM techniques. The experimental results indicate that increasing content of Mg and Si from 0.6wt% and 0.56wt% to 1.6wt% and 1.49wt% can improve mechanical property by promoting the precipitation of metastable β″ precipitates. Continuing to increase the content of Mg and Si can coarsen the MgSi phase which would crack easily under stress and lead to the decline of mechanical property. The corrosion resistance of Al-Mg-Si alloy is in inverse proportion to the content of Mg and Si associated with the density of the second phase. Corrosion always occurs in second phase or the matrix around them, while the quantity of second phase is in direct proportion to the element content, which means the alloy with higher content of Mg and Si is more susceptible to be corroded.

Key words： Al-Mg-Si alloy corrosion process mechanical property corrosion resistance

Published: 31 July 2019

CLC number:

TG146

Fund:This work was financially supported by State Administration of Science Technology and Industry for National Defense of China (2011-006).

About author:: Zhiwei Renstudied at the School of Materials Science and Engineering at Central South University since September 2016. He mainly focus on the research of high performance aluminum alloy.
Binghui Luoreceived his Ph.D. degree in materials from Central South University (CSU) in 2006. He is currently a professor in Material Science and Enginee-ring School of CSU and participates in the development of advanced structure and functional materials. His research interests are high-strength and corrosion-resistant material, advanced composite material and high dam-ping materials.

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	REN Zhiwei
	LUO Binghui
	ZHENG Yaya
	GAO Yang
	HE Chuan

Cite this article:

REN Zhiwei,LUO Binghui,ZHENG Yaya, et al. Effect of Mg and Si Content on Microstructure and Property of Al-Mg-Si Alloy[J]. Materials Reports, 2019, 33(18): 3072-3076.

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http://www.mater-rep.com/EN/10.11896/cldb.18070193 OR http://www.mater-rep.com/EN/Y2019/V33/I18/3072

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