【摘要】 研究了定向凝固制备Mg_98.5Zn_0.5Y₁合金中LPSO相的微观结构以及对电磁屏蔽性能的影响。实验结果表明Mg_98.5Zn_0.5Y₁合金中生成了有序排列的片层状14H-LPSO相。通过对比普通铸造与定向凝固Mg_98.5Zn_0.5Y₁合金的电磁屏蔽性能,发现有序排列的LPSO相可以提高合金的电磁屏蔽性能。阐述了多层均匀平面体屏蔽体的理论模型,探讨了长周期有序相的位向与镁合金电磁屏蔽性能的关系。通过在合金中加入Zr元素,研究了LPSO相的宽度对电磁屏蔽性能的影响。结果表明,在高频下细小的LPSO相能够提升材料的电磁屏蔽性能。更多还原

【Abstract】 The microstructure of the LPSO phase in Mg_98.5Zn_0.5Y₁ alloy prepared by directional solidification and its effect on electromagnetic shielding performance were investigated.The formation of 14 H-type LPSO was observed.For the directional solidification polycrystals,the LPSO exhibited a lamellar shape.By comparing the electromagnetic shielding properties of ordinary cast and directional solidified Mg_98.5Zn_0.5Y₁ alloy,it was found that the ordered LPSO phase could increase the electromagnetic shielding performance.The theoretical model of multi-layer uniform planar and the relationship between electromagnetic shielding performance and orientation of LPSO in magnesium were discussed.By adding the element Zr,the effect of the LPSO width on the electromagnetic shielding performance was investigated.The result showed that the electromagnetic shielding performance was improved in high frequency due to the addition of Zr.更多还原