应用控制凝固技术研究了定向凝固条件下Al-Mg合金的凝固过程,并着重考察了稀土在合金中的分布及对结晶组织和枝晶间距的影响。结果表明,微量稀土元素不溶于α-Al,而多在枝晶边界富集;加入稀土元素增大了合金熔体的组成过冷,较显著地影响合金的结晶形貌,并使枝晶间距减小。 The controlled solidification technique was used to study the solidification process of Al-Mg alloy under directional solidification. The distribution of rare earth in the alloy and the influence on the spacing of the crystalline structure and dendrite were also investigated. The results show that trace rare earth elements are insoluble in α-Al, and more in the dendritic boundary enrichment; addition of rare earth elements increases the composition of the alloy melt is too cold, significantly affect the crystalline morphology of the alloy, and dendrite spacing Decrease