苏娟,郭锋,蔡会生,刘亮,陈宝东.Zn固溶量对Mg-Zn-Y合金组织的影响[J].稀有金属材料与工程,2019,48(7):2179~2184.[Su Juan,Guo Feng,Cai Huisheng,Liu Liang,Chen Baodong.Effect of solid solution amount of Zn on Microstructure of Mg-Zn-Y alloy[J].Rare Metal Materials and Engineering,2019,48(7):2179~2184.]
Zn固溶量对Mg-Zn-Y合金组织的影响
投稿时间:2018-03-29  修订日期:2018-04-19
中文关键词:  稀土Y  镁合金  电化学  组织结构
基金项目:国家自然科学基金(51661025)、内蒙古自治区自然科学基金(2013ZD10)、内蒙古工业大学科学研究项目(X201506)资助
中文摘要:
      利用电化学相分离法,成功提取Mg-Zn-Y合金中的第二相,并获得合金元素在Mg-Zn-Y合金中的固溶量,建立了镁合金中直接测定元素固溶量的方法。利用Miedema混合焓模型及Toop模型(对称)和Kohler模型(非对称)计算Mg-Zn-Y三元合金中Zn的活度及活度相互作用系数,通过实验测定及计算表明:Mg-Zn-Y中Zn的自相互作用系数与Y的相互作用系数均为正值,说明这一体系里Zn与Zn,Zn与Y是相互排斥的,Y的存在可以提高Zn的活度,即Y固溶量的增加会导致Zn固溶量的降低,增加了固液界面前沿液相中的成分过冷度,从而使得晶粒细化,晶界处片层状的Mg3Y2Zn3共晶相聚集增多,逐渐连续成网状。
Effect of solid solution amount of Zn on Microstructure of Mg-Zn-Y alloy
英文关键词:Rare earth Y  magnesium alloy  electrochemical  microstructure
英文摘要:
      The second phase in Mg-Zn-Y alloy was successfully extracted by electrochemical phase separation, and the solid solution amount of alloy elements in Mg-Zn-Y alloy was obtained. A method for direct determination of solid solution in magnesium alloy was established. The activity and activity interaction coefficients of Zn in Mg-Zn-Y ternary alloy were calculated by using Miedema mixed enthalpy model and Toop model (symmetry) and Kohler model (asymmetric). The experimental measurements and calculations show that the interaction coefficients of Zn and Y in Mg-Zn-Y alloy are positive, which shows that Zn and Zn, Zn and Y are mutually exclusive in this system. The existence of Y can improve the activity of Zn, that is, the increase of Y solution will lead to the decrease of the solid solution amount of Zn. Thus, the supercooled degree of the liquid phase in the front of the solid-liquid interface is increased, so that the grain is refined, and the Mg3Y2Zn3 eutectic phase of the grain boundary is increased and the mesh is gradually continuous.
作者单位E-mail
苏娟 内蒙古工业大学 材料科学与工程学院 gdsujuan@163.com 
郭锋 内蒙古工业大学 材料科学与工程学院  
蔡会生 内蒙古工业大学 材料科学与工程学院  
刘亮 内蒙古工业大学 材料科学与工程学院  
陈宝东 内蒙古工业大学 材料科学与工程学院  
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