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研究了Co含量对熔体快淬Fe_(55-x)Co_xPt_(15)B_(30)(x=0~45,原子分数,%)合金热处理前后的组织结构和磁性能的影响。结果表明,添加Co可提高Fe_(55-x)Co_xPt_(15)B_(30)合金的非晶形成能力,使x=15~45的快淬合金形成非晶态。经适当热处理后,合金中形成了由有序面心四方结构的永磁(Fe,Co)-Pt(L1_0)相和软磁(Fe,Co)2B相及(Fe,Co)B相组成的纳米复相组织,显示出永磁性;添加Co的合金组织得到明显细化,x=15~45合金平均晶粒尺寸均约为18 nm;其中x=15合金具有最佳的永磁性能,磁能积达到94.4 k J/m3。合金的矫顽力随Co含量的增加而增大,在x=30时达到最大值413.7 k A/m后,随Co含量的进一步增加而减小;这是由于不同Co含量使L1_0相的c/a值发生变化而导致其磁晶各向异性变化的结果。
The effects of Co content on the microstructures and magnetic properties of the as-quenched Fe 55-x Co x Pt 15 B 30 (x = 0-45, atomic fraction,%) alloy before and after heat treatment were investigated. The results show that the addition of Co can improve the amorphous formation ability of Fe 55-x Co x Pt 15 B 30 alloy and make the quenched alloy with x 15-45 amorphous. After proper heat treatment, the phase structure of permanent magnet (Fe, Co) -Pt (L1_0) and soft magnet (Fe, Co) B phase and (Fe, Co) The microstructure of nanocomposite shows permanent magnetism. The microstructure of the alloy with Co addition is obviously refined. The average grain size of x = 15-45 alloy is about 18 nm. Among them, x = 15 alloy has the best permanent magnetic property, The product reaches 94.4 kJ / m3. The coercivity of the alloy increases with the increase of Co content and reaches the maximum value of 413.7 kA / m at x = 30, which decreases with the further increase of Co content. / a value changes resulting in changes in the magnetocrystalline anisotropy results.