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金属学报  2017, Vol. 53 Issue (5): 609-614    DOI: 10.11900/0412.1961.2016.00485
  论文 本期目录 | 过刊浏览 |
Co含量对熔体快淬Fe55-xCoxPt15B30合金的组织结构与磁性能的影响
马殿国1,王英敏1,李艳辉1,张伟1()
1 大连理工大学材料科学与工程学院辽宁省凝固控制与数字化制备技术重点实验室 大连 116024
2 Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Effect of Co Content on the Structure and Magnetic Properties of Melt-Spun Fe55-xCoxPt15B30 Alloys
Dianguo MA1,Yingmin WANG1,Kunio YUBUTA2,Yanhui LI1,Wei ZHANG1()
1 Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
2 Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
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摘要: 

研究了Co含量对熔体快淬Fe55-xCoxPt15B30 (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Fe55-xCoxPt15B30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 (L10)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 kJ/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 kA/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L10相的c/a值发生变化而导致其磁晶各向异性变化的结果。

关键词 非晶态合金纳米复相永磁材料L10-FePt相结晶化磁性能    
Abstract

Fe-Pt-B nanocomposite magnets have attracted much attention because of their excellent hard magnetic properties, in which the face-centered-tetragonal FePt (L10) phase ensures high coercivity (iHc) and the Fe2B phase provides high magnetic saturation. A high iHc, however, is hard to reach at low Pt concentrations in these nanocomposite magnets. It is known that a high concentration of B favors the formation of L10 phase in Fe-Pt-B alloys with low Pt concentration, but the annealed microstructure is usually coarse-grained due to their low amorphous-forming abilities, and the magnetic properties get deteriorated. Replacement of Fe with Co is expected to enhance the amorphous-forming ability of Fe-Pt-B alloys with low Pt and high B concentrations, and to improve their magnetic properties. In this work, the structure and magnetic properties of as-quenched and annealed Fe55-xCoxPt15B30 (x=0~45, atomic fraction, %) alloys have been investigated. Melt-spun ribbons were prepared by melt spinning, followed by vacuum annealing at different temperatures. The structure and magnetic properties of the samples were examined by XRD, TEM and a vibrating sample magnetometer (VSM). The results indicate that single amorphous phase is formed in the alloys at x=15~45. After appropriate annealing, a nanocomposite structure consisting of L10 and (Fe, Co)2B phases is obtained at x=0 and 15, and an additional (Fe, Co)B phase gets formed at x=30 and 45. A fine microstructure with mean grain size of ~18 nm has been obtained in the annealed alloys with x=15~45. In these nanocomposite alloys, the best hard magnetic property with an energy product of 94.4 kJ/m3 is reached at x=15. With increasing Co content, the iHc gradually increases to a maximum value of 413.7 kA/m at x=30, and then decreases at higher Co contents, which are attributed to the change of the magnetocrystalline anisotropy in L10 phases with different c/a ratios.

Key wordsamorphous alloy    nanocomposite magnet    L10-FePt phase    crystallization    magneticproperty
收稿日期: 2016-11-02      出版日期: 2017-03-13
基金资助:国家自然科学基金项目Nos.51571047和51171034

引用本文:

马殿国,王英敏,李艳辉,张伟. Co含量对熔体快淬Fe55-xCoxPt15B30合金的组织结构与磁性能的影响[J]. 金属学报, 2017, 53(5): 609-614.
Dianguo MA,Yingmin WANG,Kunio YUBUTA,Yanhui LI,Wei ZHANG. Effect of Co Content on the Structure and Magnetic Properties of Melt-Spun Fe55-xCoxPt15B30 Alloys. Acta Metall, 2017, 53(5): 609-614.

链接本文:

http://www.ams.org.cn/CN/10.11900/0412.1961.2016.00485      或      http://www.ams.org.cn/CN/Y2017/V53/I5/609

图1  Fe55-xCoxPt15B30快淬条带的XRD谱
图2  Fe40Co15Pt15B30非晶合金在不同温度热处理900 s后的XRD谱
图3  Fe40Co15Pt15B30合金在不同温度热处理900 s后的退磁曲线
x a / nm c / nm c/a
0 0.3859 0.3699 0.9585
15 0.3851 0.3693 0.9589
30 0.3843 0.3690 0.9604
45 0.3839 0.3681 0.9588
表1  Fe55-xCoxPt15B30合金经823 K热处理900 s后L10相的晶格常数
x iHc Br Mr / Ms (BH)max
kAm-1 T kJm-3
0 225.1 1.02 0.81 64.7
15 275.9 0.97 0.84 94.4
30 413.7 0.50 0.75 33.5
45 184.8 0.47 0.75 27.7
表2  Fe55-xCoxPt15B30合金经823 K热处理900 s后相的磁性能
图4  Fe55-xCoxPt15B30合金在823 K热处理900 s后的XRD谱
图5  Fe55-xCoxPt15B30合金在823 K热处理900 s后的磁滞回线
图6  Fe55-xCoxPt15B30合金在823 K热处理900 s 后的TEM明场像和SAED谱
[1] Kneller E F, Hawig R.The exchange-spring magnet: A new material principle for permanent magnets[J]. IEEE Trans. Magn., 1991, 27: 3588
[2] Skomski R, Coey J M D. Nucleation field and energy product of aligned two-phase magnets-progress towards the '1 MJ/m3' magnet[J]. IEEE Trans. Magn., 1993, 29: 2860
[3] Skomski R.Aligned two-phase magnets: permanent magnetism of the future? (invited)[J]. J. Appl. Phys., 1994, 76: 7059
[4] Coehoorn R, de Mooij D B, de Waard C. Meltspun permanent magnet materials containing Fe3B as the main phase[J]. J. Magn. Magn. Mater., 1989, 80: 101
[5] Ding J, Liu Y, Street R, et al.High magnetic performance in isotropic α-Fe+Sm2Fe17Nx[J]. J. Appl. Phys., 1994, 75: 1032
[6] Goll D, Seeger M, Kronmüller H.Magnetic and microstructural properties of nanocrystalline exchange coupled PrFeB permanent magnets[J]. J. Magn. Magn. Mater., 1998, 185: 49
[7] Watanabe K, Masumoto H.On the high-energy product Fe-Pt permanent magnet alloys[J]. Trans. Jpn. Inst. Met., 1983, 24: 627
[8] Cebollada A, Weller D, Sticht J, et al.Enhanced magneto-optical Kerr effect in spontaneously ordered FePt alloys: Quantitative agreement between theory and experiment[J]. Phys. Rev., 1994, 50B: 3419
[9] Zhang W, Louzguine D V, Inoue A.Synthesis and magnetic properties of Fe-Pt-B nanocomposite permanent magnets with low Pt concentrations[J]. Appl. Phys. Lett., 2004, 85: 4998
[10] Chang C W, Chang H W, Chiu C H, et al.Fe-B/FePt-type nanocomposite ribbons with high permanent magnetic properties[J]. J. Magn. Magn. Mater., 2005, 292: 120
[11] Zhang W, Ma D G, Li Y H, et al.Structure and magnetic properties of melt-spun Fe-Pt-B alloys with high B concentrations[J]. J. Alloys Compd., 2014, 615: S252
[12] Zhang B W, Xie H W.Effect of alloying elements on the amorphous formation and corrosion resistance of electroless Ni-P based alloys[J]. Mater. Sci. Eng., 2000, A281: 286
[13] Xu K, Ling H B, Li Q, et al.Effects of Co substitution for Fe on the glass forming ability and properties of Fe80P13C7 bulk metallic glasses[J]. Intermetallics, 2014, 51: 53
[14] Inoue A, Zhang W. Nanocrystalline Fe-Pt-B base hard magnets with high coercive force obtained from amorphous precursor [J]. J. Appl. Phys., 2005, 97: 10H308
[15] Chang C W, Chang H W, Hsieh C C, et al.Effect of B content on the magnetic properties, phase evolution, and aftereffect of nanocrystalline FeCoPtB ribbons[J]. J. Appl. Phys., 2009, 105
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