研究了强磁场对Fe-49%Sn(质量分数)偏晶合金凝固组织演变及磁性能的影响. 结果表明: 施加强磁场可以显著改变富Fe相枝晶形貌, 进而改善材料的磁性能.在无磁场作用下富Fe相为无方向性的枝晶及网状组织形貌; 随磁感应强度增加, 富Fe相沿平行磁场方向定向排列程度增加, α-Fe的(110)晶面衍射强度增强. 分析认为, 这是由于强磁场诱使晶体磁各向异性能增加, 使得α-Fe枝晶择优取向作用增强. 根据样品磁滞回线计算的磁各向异性能结果与理论分析一致. 另外, XRD分析表明, 有、无强磁场作用下凝固样品的物相均不变, 都由α-Fe, β-Sn,FeSn及FeSn2组成.
The effect of a high magnetic field (HMF) on solidification microstructure and magnetic properties of Fe-49%Sn hypermonotectic alloys have been studied. It was showed that the morphologies of Fe-rich dendrites could be changed obviously and then magnetic properties were induced to improve. The morphologies of Fe-rich without HMF were dendrites in random and partially cellular structures. The alignment and preferential growth of Fe-rich dendrites paralleled to the applied field occurred with 10T. The primary dendrite arms of Fe-rich phase could be induced to align along [001] direction. The secondary dendrites were broken to fragments and even disappeared. Microstructure evolution and theoretical analysis were proposed to explain these results, which were in terms of magnetic crystalline anisotropy and preferential growth of dendrites. The aligned structures caused the increased magnetic properties such as the maximum magnetic permeability, remanent magnetization and magnetic crystalline anisotropy energy.
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