强磁场下Fe-49%Sn偏晶合金凝固组织及磁性能

MICROSTRUCTURES AND MAGNETIC PROPERTIES OF Fe-49%Sn MONOTECTIC ALLOYS SOLIDIFIED UNDER A HIGH MAGNETIC FIELD

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折一致.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FeSn_2组成.

A high magnetic field can make the morphology of Fe-rich dendrites in Fe 49%Sn （mass fraction） alloy change obviously and magnetic property improve. The morphology of Fe rich phase without field is dendrites in random and partially net structures. With the increase in the imposed magnetic flux density, the alignment of the Fe rich dendrites paralleled to the imposed field is more obvious, and the relative intensity of the （110） plane of α-Fe phases in XRD pattern strengthens, which are related to the increase in magnetic crystalline anisotropy energy induced by the field. The estimated magnetic crystalline anisotropy energies from hysteresis loops of Fe 49%Sn alloys are consistent with the analytical results. Moreover, XRD analysis showed the Fe-49%Sn alloy are composed of α-Fe, β-Sn, and intermetallic compounds FeSn and FeSn2, which is independent of magnetic flux density.