Microstructural evolution and magnetic property of rapidly solidified Co62Mo38 hypereutectic alloy

Microstructural evolution and magnetic property of rapidly solidified Co62Mo38 hypereutectic alloy
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快凝Co62Mo38过共晶合金的显微组织演变及磁性能

DOI:
10.1016/j.matlet.2021.129574
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发表时间:
2021-05
期刊:
影响因子:
3
通讯作者:
B. Wei
B. Wei
中科院分区:
材料科学3区
文献类型:
--
作者:
S. Sha;J. Chang;S.S. Xu;P.X. Yan;B. Wei

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为了研究过共晶Co 62 Mo 38合金磁性能的微观结构依赖性,采用电磁悬浮和落管技术对其进行了充分过冷处理。悬浮态和微重力条件下的最大过冷度分别为232 K(0.13TL)和313 K(0.18TL)。在过冷度较小时,最终组织由板条状初生ε-Co 7 Mo 6枝晶和枝晶间(α-Co + ε-Co 7 Mo 6)共晶组成。随着过冷度的增加,α-Co相的体积分数不断降低,导致饱和磁化强度降低。同时,由于α-Co晶粒的粗化,矫顽力呈下降趋势。当过冷度超过271 K时,ε-Co 7 Mo 6化合物开始等轴生长。在这种情况下,饱和磁化强度的值突然增加的合金过冷度的增加,而矫顽力进一步降低。
To investigate the microstructural dependence of magnetic property for hypereutectic Co62Mo38alloy, it was sufficiently undercooled by electromagnetic levitation (EML) and drop tube (DT) techniques. The maximum liquid undercoolings attained as 232 K (0.13TL) at levitated state and 313 K (0.18TL) under microgravity condition, respectively. At small undercoolings, the final microstructure consisted of lath-shaped primary ε-Co7Mo6dendrites and interdendritic (α-Co + ε-Co7Mo6) eutectics. As the undercooling increased, the volume fraction of α-Co phase decreased continuously, leading to a reduction in saturation magnetization. Meanwhile, the coercive force exhibited a downward trend due to the coarsening of α-Co grain. Once the undercooling exceeded 271 K, the equiaxed growth of ε-Co7Mo6compound was induced. In this case, the value of saturation magnetization abruptly increased with the increase of alloy undercooling, whereas the coercive force was further reduced.
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