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OALib Journal期刊
ISSN: 2333-9721
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Tb-Dy-Fe-Co合金本征磁致伸缩性能
DOI: 10.3724/SP.J.1037.2010.00449, PP. 214-218
Keywords: 元素分布,应用温度,磁晶各向异性,磁致伸缩
Abstract:
研究了Tb0.36Dy0.64(Fe0.85Co0.15)1.95合金中替换元素Co的分布及其对材料内禀磁性和本征磁致伸缩性能的影响.EDS分析表明,合金中产生了Co富集的富稀土相,Co在其中的含量为21.18%(原子分数),高于基体中Co的含量9.36%.Co元素部分替换Fe未改变巨磁致伸缩合金主相Laves相的结构,合金的Curie温度从378℃提高到420℃,拓展了应用温度范围;同时,Co元素的添加部分补偿了由于Tb/Dy比例提高所增大的磁晶各向异性,有利于改善合金低场性能.为避免样品的生长取向对本征磁致伸缩性能测量的影响,保证测量结果的准确性,制备了Tb0.36Dy0.64(Fe0.85Co0.15)1.95无取向等轴晶样品,测量了合金的饱和磁致伸缩常数λs.通过Laves相XRD谱中(440)峰的劈裂,计算了沿方向上的磁致伸缩λ111,由此计算出沿方向上的磁致伸缩λ100.与Tb0.3Dy0.7Fe1.95合金相比,Co添加后λ111稍有降低,λ100得到显著提升,饱和磁致伸缩常数λs基本相当.
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