MgCO3对镁合金细化机理的研究
Refining Mechanism of Grain by Adding MgCO3 in Mg Alloy
王瑞权， 邱葭菲， 林 波， 陈云祥
点击：4994次 下载：0次
作者单位：(浙江机电职业技术学院， 浙江 杭州 310053)
中文关键字：MgCO3； 镁合金； 晶粒细化； Al4C3； 异质形核
英文关键字：MgCO3; Mg alloy; grain refinement; Al4C3; heterogeneous nucleation
中文摘要：通过金相显微镜、电子探针、扫描电镜和能谱仪等设备分析了MgCO3对AM60B合金的细化效果与机理。结果表明：MgCO3能够明显起到晶粒细化的作用，改善了实验合金的显微组织。一方面这是由于MgCO3加入合金后释放出了CO2，其中的C与Al元素反应生成了Al4C3，为合金提供了大量异质形核，从而使合金显著细化；另一方面是由于被排斥到液固界面前沿的C与Al化合物结晶时产生了富集，从而阻止了镁与铝的扩散。
英文摘要：The effect and mechanism of grain refinement for AM60B alloys by adding MgCO3 were analyzed by using OM, EPMA, SEM and EDS. It can be found that the grain of the alloy is obviously refined and the microstructure of the alloy is improved by increasing MgCO3 addition in Mg alloy. On the one hand, due to post-release CO2 after adding MgCO3 into magnesium alloy, the reaction of C and Al generates Al4C3, which can provide a large number of heterogeneous nucleation for the alloy, thereby significantly refine the alloys; on the other hand, C and Al are excluded to the liquid-solid cutting-edge interface chance to crystal enrichment when the compounds generate, which can prevent the proliferation of magnesium and aluminum.