铸造Mg-RE合金晶粒细化行为研究现状与展望

吴国华, 童鑫, 蒋锐, 丁文江

Grain Refinement of As-Cast Mg-RE Alloys: Research Progress and Future Prospect

WU Guohua, TONG Xin, JIANG Rui, DING Wenjiang

表1 RE元素在镁合金中的液相线斜率(m)、溶质平衡分配系数(k)和生长限制因子(Q) (溶质元素浓度Ci = 1.0%，质量分数)[21]

Table 1 Slope of the liquidus (m), solute partition coefficient (k), and growth restriction factor(Q) of RE elements in Mg alloys (concentration of solute element Ci = 1.0%, mass fraction)[21]

Element m / (oC·%-1) k Q / oC Nd -3.557 0 3.557 Sm -3.4 0.135 2.943 Pr -2.909 0 2.909 La -2.895 0 2.895 Yb -3.098 0.133 2.685 Eu -2.49 0 2.49 Tb -2.99 0.306 2.073 Ce -1.725 0 1.725 Y -1.624 0 1.624 Gd -2.595 0.605 1.025 Ho -2.196 0.608 0.86 Dy -2.349 0.647 0.828 Tm -1.58 0.647 0.557 Er -2.157 0.757 0.524 Lu -0.68 0.82 0.123