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

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2017,（6）
• 页码范围: 558-566
• 页数: 9页
• 语种: 英文

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 GW103K 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 GW103K 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℃,mould temperature of 110 ℃,and flame-retardant addition of 1％.The fire retardant mechanism of moulding sand was determined.