Effects of processing parameters and addition of flame-retardant into moulding sand on the microstructure and fluidity of sand-cast magnesium alloy Mg-10Gd-3Y-0.5Zr

Yanlei Li¹，Guohua Wu¹，Antao Chen¹，Wencai Liu¹，Yingxin Wang^1,2，Liang Zhang¹

1. National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University2. Shanghai Light Alloy Net Forming National Engineering Research Center Co., Ltd.

摘 要：In this study, the effects of processing parameters（such as pouring temperature and mould pre-heating temperature） and flame-retardant content on the microstructure and fluidity of sand-cast magnesium（Mg） alloy Mg-10Gd-3Y-0.5Zr（GW103K） were systematically investigated. It was found that the increase of pouring temperature leads to coarsened microstructure and decreased fluidity of sand-cast GW103 K alloy. Increase of mould pre-heating temperature incurs coarsening of as-cast microstructure and increase of fluidity. The addition of flame-retardant into moulding sand has a negligible influence on the microstructure of sand-cast GW103 K alloy. With the increase in flame-retardant content,fluidity of the alloy initially increases and then decreases. The optimized process parameters and flameretardant addition were obtained to be pouring temperature of 750?C, mould temperature of 110?C, and flame-retardant addition of 1%. The fire retardant mechanism of moulding sand was determined.

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