李博,董允,樊志斌,徐高鹏,谢宏斌,周婷

• 1:东北大学秦皇岛分校资源与材料学院

摘要(Abstract)：

采用Factsage热化学软件计算了平衡条件和Scheil条件下实验合金的凝固路径及相组成。在与之对比基础上研究了常规铸造(金属型)和4 GPa高压下凝固的实验合金凝固过程和相组成。结果表明:金属型铸造下,四相包共晶转变和随后的WMg_3Y_2Zn_3相分解不充分,室温下凝固组织由α-Mg基体,W-Mg_3Y_2Zn_3和I-Mg_3YZn_6相组成。4 GPa高压下凝固时,因液相线温度升高及单位面积α-Mg晶体形核率大幅增多,使α-Mg相所占体积分数增多,分布在枝晶间最后凝固的共晶液相发生偏析型离异共晶转变,生成面积尺寸很小的骨骼状共晶相半连续分布在枝晶间。4 GPa高压下凝固时,当熔体过热度很小时,初生晶α-Mg为规则的、分枝不发达的等轴晶(晶粒尺寸为20μm);随熔体过热度升高,不但晶粒尺寸增大,枝晶分叉、二次枝晶重熔、破碎等现象也逐渐显现;4 GPa高压下凝固组织由α-Mg+I-Mg_3YZn_6相组成。

关键词(KeyWords)： Scheil凝固;高压凝固;凝固过程;离异共晶;晶粒尺寸

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51675092);; 河北省自然科学基金(E2014501123)

作者(Author): 李博,董允,樊志斌,徐高鹏,谢宏斌,周婷

DOI: 10.13289/j.issn.1009-6264.2017.01.005

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