Refining Effect/Mechanism of SrCO3 in AZ31 Magnesium Alloy

Chin J Mater Res

2010, Vol. 24

Issue (6): 597-602 DOI:

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Refining Effect/Mechanism of SrCO3 in AZ31 Magnesium Alloy

GAO Shengyuan, ZHANG Zhiqiang, LE Qichi, CUI Jianzhong

Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110004

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GAO Shengyuan ZHANG Zhiqiang LE Qichi CUI Jianzhong. Refining Effect/Mechanism of SrCO3 in AZ31 Magnesium Alloy. Chin J Mater Res, 2010, 24(6): 597-602.

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Abstract The influence of SrCO3 on the microstructure of AZ31 magnesium alloy has been investigated. The results show that AZ31 magnesium alloy has the best refining effect when the AZ31 magnesium alloy with addition of 0.6% SrCO3 in 760, the average grain size of the α–Mg grain decreases from about 570±15 μm of AZ31 base alloy to 110±10 μm, the reduced extent is about 80.7%.Based on the analysis of EDS, Ebind and Gibbs free energy, the mechanism of grain refiner was generation of Al4C3 that can be used as crystallization center of the Mg when SrCO3 added. Due to the generation of Al4C3 in AZ31 magnesium alloy, the grain boundary is pined and the grain growth is limited. The Al element was quickly pushed to the grain boundary along with the solid/quid intergace,and generated the β– Mg17Al12 phase along the grain boundary which has an effect of immobilizing the grain boundaries.

Key words: metallic material grain refinement AZ31 SrCO3 Al4C3

Received: 01 April 2010

ZTFLH:

TG146.2

Fund:

Supported by Major State Basic Research Development Program of China Nos.2007CB613701 & 2007CB613702, National Natural Science Foundation of China Nos.50906018, 51004032 & 50974037, Fundamental Research Foundation of Central Universities Nos.90409002 & 90209002.

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	GAO Qing-Yuan
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https://www.cjmr.org/EN/ OR https://www.cjmr.org/EN/Y2010/V24/I6/597

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