磁场退火对Fe80Si9B11非晶合金的磁致伸缩特性影响

摘要：利用激光多普勒法测量50Hz下非晶合金带材的磁致伸缩曲线,研究了磁场退火对Fe80Si9B11非晶合金带材的磁致伸缩特性的影响。结果显示,在相同的磁场强度下非晶带材经横磁退火后磁致伸缩最大,无磁场退火次之,纵磁退火时最小。然后,采用Kerr方法观察了非晶合金带材的磁畴形貌,从微观结构上解释了经不同磁场退火后磁致伸缩大小不同的机理。最后,对无磁场退火、横磁退火和纵磁退火后的Fe80Si9B11铁基非晶合金铁芯进行了噪音测试。结果显示,在相同的频率和磁通密度下,非晶合金铁芯经横磁退火后噪音最大,无磁场退火次之,纵磁退火时噪音最小,与非晶合金带材经不同磁场热处理后磁致伸缩大小的规律一致。为解决非晶合金铁芯在实际应用中的噪音问题提供了参考。     

磁场退火对Fe_(80)Si_9B_(11)非晶合金的磁致伸缩特性影响

利用激光多普勒法测量50 Hz下非晶合金带材的磁致伸缩曲线,研究了磁场退火对Fe_(80)Si_9B_(11)非晶合金带材的磁致伸缩特性的影响。结果显示,在相同的磁场强度下非晶带材经横磁退火后磁致伸缩最大,无磁场退火次之,纵磁退火时最小。然后,采用Kerr方法观察了非晶合金带材的磁畴形貌,从微观结构上解释了经不同磁场退火后磁致伸缩大小不同的机理。最后,对无磁场退火、横磁退火和纵磁退火后的Fe_(80)Si_9B_(11)铁基非晶合金铁芯进行了噪音测试。结果显示,在相同的频率和磁通密度下,非晶合金铁芯经横磁退火后噪音最大,无磁场退火次之,纵磁退火时噪音最小,与非晶合金带材经不同磁场热处理后磁致伸缩大小的规律一致。为解决非晶合金铁芯在实际应用中的噪音问题提供了参考。     

逆变焊机用Fe_(73.5)Cu_1Mo_3Si_(15.5)B_7超微晶合金的软磁性能

对比了Fe73.5Cu1Mo3Si15.5B7超微晶合金和目前逆变焊机主变压器普遍采用的Fe73.5Cu1Nb3Si15.5B7铁芯的静态和动态磁性能。重点研究了两种材料铁芯的饱和磁致伸缩系数、10~40kHz范围内的高频性能和脉冲性能、-40~140℃间的损耗及磁导率变化。研究结果表明,Fe73.5Cu1Mo3Si15.5B7铁芯可获得低的高频损耗、高磁导率、较低的饱和磁致伸缩系数及良好的温度稳定性,满足逆变焊机主变压器对铁芯材料的要求,同时,Fe73.5Cu1Mo3Si15.5B7带材韧性更高,可改善材料制备的工艺性能和快淬带材的力学性能,提高成材率。     

各种热处理对FeSiBNbCu纳米晶带材巨磁阻的影响

我们在本文研究了具有不同磁致伸缩系数的Fe73.5Si13.5B9Nb3Cu13和Fe73.5Si16.5B6Nb3Cu1纳米晶带材在0．1－2MHz范围磁阻和频率的关系。铸态样品分别在施加直流和交流磁场及未施加直流和交流磁场中进行氩气氛560℃退火,在某一固定频率、含13．5％Si的样品加磁场退火和未加磁场退火后相比,可看到性能有了改进,含16．5％Si的样品加磁场退火和未加磁场退火相比,仅观察到磁阻率减小,磁特性分析和X光衍射数据显示,所观察到的磁阻效应改变是由于磁感应各向异性的结果。     

制备过程中FeSiB非晶带材自由面氧化对磁性能的影响

摘要：利用X射线衍射（XRD）及X射线光电子谱（XPS）对采用平面流铸法制备的Fe78Si9B13非晶带材进行了分析,研究结果表明：当只有熔潭前端被CO保护时,所制备出的Fe78Si9B13非晶带材自由面会出现厚约10nm的Fe2O3氧化层;经XRD分析,Fe2O3氧化层的产生会使得带材自由面在2θ为661°处出现Fe(Si)固溶体晶化相,从而恶化带材磁性能。在非晶带材的制备过程中,采用CO气体对熔潭前端与后端同时进行保护,可有效避免非晶带材自由面的氧化,改善带材磁性能。     

0.18 mm极低损耗取向硅钢电磁特性与铁心性能仿真分析#br#

基于极低损耗取向硅钢研制S15型超高能效变压器对于进一步推动电网节能增效具有重要意义。采用任意波形磁场激励测量系统对比研究了0.18 mm规格取向硅钢、1K101-S普通型、1K102-P高磁感型非晶合金的磁性能及磁致伸缩噪声特性,并分析了0.18 mm取向硅钢在谐波、直流偏磁等复杂工况下的损耗特性,采用MagNet有限元分析软件开展了0.18 mm极低损耗硅钢S15型变压器铁心、绕组建模与仿真分析。结果表明,磁通密度为1.35 T时,18QH065牌号取向硅钢的铁损低至0.349 W/kg,不断接近非晶合金水平,磁感B800则比非晶带材高0.32~0.40 T;取向硅钢的磁致伸缩系数λp-p为0.29×10-6,低于非晶合金超1个数量级。与0.23~0.30 mm常规厚度硅钢相比,0.18 mm薄规格硅钢的谐波损耗优势明显,10%含量的3次、5次谐波损耗与正常工况相比分别上升12.9 %、16.0 %;直流偏置磁场大小对取向硅钢铁损的影响主要在低磁密区,在1.9 T以上0~150 A/m偏置磁场下的铁损几乎相同。设计的10 kV/630 kVA变压器空载损耗仿真计算值为392.5 W,比国标GB 20052—2013中能效1级硅钢变压器的限定值低约31.1 %,噪声比同等容量非晶合金变压器低约10 dB,具有显著的节能和环保优势。     

电流退火对铁基非晶合金Fe78Si9B13薄带巨应力阻抗效应的影响

研究了电流退火工艺对非晶Fe78Si9B13薄带巨应力阻抗效应的影响.实验结果表明,在外加应力下对非晶合金进行电流退火,巨应力阻抗效应显著提高,并且ΔZ/Z最大值随退火电流密度的增加先增加然后减小.Fe78Si9B13合金在40 MPa预应力下,经34 A/mm2电流退火后,阻抗的最大相对变化率达到180 %.认为上述阻抗变化与电流退火过程中应力感生各向异性有关.     

0.18 mm极低损耗取向硅钢电磁特性与铁心性能仿真分析

基于极低损耗取向硅钢研制S15型超高能效变压器对于进一步推动电网节能增效具有重要意义。采用任意波形磁场激励测量系统对比研究了0.18 mm规格取向硅钢、1K101-S普通型、1K102-P高磁感型非晶合金的磁性能及磁致伸缩噪声特性,并分析了0.18 mm取向硅钢在谐波、直流偏磁等复杂工况下的损耗特性,采用MagNet有限元分析软件开展了0.18 mm极低损耗硅钢S15型变压器铁心、绕组建模与仿真分析。结果表明,磁通密度为1.35 T时,18QH065牌号取向硅钢的铁损低至0.349 W/kg,不断接近非晶合金水平,磁感B800则比非晶带材高0.32～0.40 T;取向硅钢的磁致伸缩系数λp-p为0.29×10-6,低于非晶合金超1个数量级。与0.23～0.30 mm常规厚度硅钢相比,0.18 mm薄规格硅钢的谐波损耗优势明显,10%含量的3次、5次谐波损耗与正常工况相比分别上升12.9%、16.0%;直流偏置磁场大小对取向硅钢铁损的影响主要在低磁密区,在1.9 T以上0～150 A/m偏置磁场下的铁损几乎相同。设计的10 kV/630kVA变压器空载损耗仿真计算值为392.5 W,比国标GB20052—2013中能效1级硅钢变压器的限定值低约31.1%,噪声比同等容量非晶合金变压器低约10 dB,具有显著的节能和环保优势。     

微量稀土元素Tb、La掺杂对Fe-Al合金结构和磁致伸缩性能的影响

为了研究微量稀土元素Tb和La掺杂对Fe81Al19合金结构和磁致伸缩性能的影响及影响机制,采用真空电弧熔炼法制备了Fe81Al19、Fe81Al19La0.1和Fe81Al19Tb0.1三种铸态合金。用X射线衍射仪(XRD)和扫描电镜联合能谱仪(SEM/EDS)分析了合金的微结构。用振动样品磁强计(VSM)和磁致伸缩测量仪测试了合金的磁性能和磁致伸缩系数。结果表明,Fe81Al19合金由单一的bcc结构A2相组成,而掺杂稀土后的Fe81Al19Tb0.1和Fe81Al19La0.1合金均由bcc结构的A2主相和少量富稀土相组成。稀土Tb和La的掺杂使Fe81Al19合金沿<100>晶向择优取向,且Fe81Al19Tb0.1合金择优取向更加明显。此外,三种合金的磁化功大小排序为:Fe81Al19Tb0.1> Fe81Al19La0.1> Fe81Al19。表明稀土元素掺杂导致Fe-Al合金具有更大的磁晶各向异性,且Tb的掺杂效果更加明显。磁致伸缩系数测试表明,与Fe81Al19合金相比,稀土掺杂合金的磁致伸缩系数明显增大,而且Fe81Al19Tb0.1合金的磁致伸缩系数增大的更加明显,大约是Fe81Al19合金的3.2倍,为86×10^-6。稀土掺杂合金磁致伸缩系数增大的原因主要源于掺杂稀土使Fe-Al合金沿<100>晶向择优取向和稀土导致合金具有高磁晶各向异性。     

纳米晶软磁合金Fe-Zr-Nb-B的磁性能

本文通过对纳米晶软磁合金Fe-Zr-Nb-B磁性能的研究，得知当合金成分配比为Fe85.5Zr2Nb4B8.5且退火40min后合金的磁性能是最佳的。其磁导率为60，000(1kHz)，饱和磁感应强度为1.64T，磁致伸缩几乎为零。合金的铁损也很低，在1．4T、50Hz时低至0．09W／kg，这个值比Fe-Si-B系非晶合金要低很多。因此Fe-Zr-Nb-B合金很适合做杆式变压器材料。     

Effect of Ho-doping on microstructure and magnetostriction of TbDyFe alloys

Tb0.3Dy0.7HoxFe1.95 (x=0.00, 0.05, 0.10, 0.15, 0.20, 0.35, 0.50, 0.65) quaternary alloys were prepared by arc-melting and followed by annealing. The phases present and structure of the alloys were determined using a D8-Advance X-ray diffractometer. The magnetostriction of the alloys was studied by standard strain gauge technique. The dependence of Ho content on the structure, magnetostriction and density of the alloys was investigated in detail. The research results showed that Ho-doping did not change MgCu2-type cubic Laves structure in Tb0.3Dy0.7Fe1.95. When Ho content x≤0.2, rich rare earth phase presented in the alloys increased and magnetostriction of the alloys reduced evidently with increasing x, but for alloys with x>0.2, the content of rich rare earth phase started to reduce and the magnetostriction increased quickly, especially at low magnetic field in the alloy with x=0.65 due to separation of rich rare earth phases on the surface of the alloy.     

Fe81Zr5Nb4B10非晶合金的晶化过程及其磁性研究

采用单辊快淬法制备Fe81Zr5Nb4B10非晶合金带,并在不同温度下对其进行退火处理,利用XRD和振动样品磁强计(VSM)测试了合金自由面和贴辊面的结构及磁性能。结果表明:随着退火温度的增加,淬态合金由完全的非晶态结构转变为非晶与纳米晶的混合结构,晶粒尺寸、晶化体积分数增大,晶粒间的非晶层厚度减小。和自由面相比,贴辊面的晶粒尺寸较大,晶化体积分数较小,晶粒间的非晶层厚度较大。合金的矫顽力和比饱和磁化强度σs随着退火温度的升高逐渐增大。     

Research on microstructure and magnetostriction of Fe₈₃Ga₁₇Dy_x alloys

The crystal structure,microstructure and the magnetostriction of Fe83Ga17Dyx(x=0,0.2,0.4,0.6) series alloys were studied.The results showed that the influence of the Dy on the crystal structure of the alloy was very small but the effect on the microstructure was significant when different contents of Dy were added into the Fe83Ga17 alloy,respectively.Meanwhile,the magnetostriction of Fe83Ga17Dy0.2 alloy was greatly enhanced,the magnetostriction λ value reached 300×10-6 at 400(kA/m) magnetic field.     

Effect of Solidification Texture on the Magnetostrictive Behavior of Galfenol

This study investigates the magnetostrictive functionality of crystallographic textures developed by directional solidification of a vacuum-melted galfenol cast button. A polycrystalline Fe_82.4Ga_17.6 alloy was melted using vacuum arc melting and solidified in a water-cooled copper mold. Optical metallography confirmed the development of large columnar grains in the solidification microstructure. Phase constitution and magnetic domain structures of sample were studied by X-ray diffraction (XRD) and magnetic force microscopy (MFM). The results showed that the cast button has a disordered body-centered cubic (bcc) (A2) single-phase structure that consisted of a combination of well-aligned stripe-like and maze-like magnetic domains. To investigate the magnetostriction behavior, a couple of pins were cut along columnar grains as well as in the transverse direction. Magnetostriction was measured in the presence of an externally applied magnetic field. It was found that pins cut along the columnar grains comprised very high magnetostriction, whereas transverse pins had lower magnetostriction against the applied field.     

Thermodynamics and Magnetostriction of Fe-Co-B-Si-Nb-C Bulk Metallic Glasses

Fe-Co-B-Si-Nb-C glassy alloy with the addition of C was prepared by arc melting and copper suck-casting. The thermodynamics and soft magnetic properties were investigated. The casted amorphous alloys were heat-treated at different temperatures. The differential scanning calorimeter (DSC) results and thermal expansion show complete thermodynamics of crystallization. Its magnetostriction properties were studied by capacitance method. Saturation magnetostriction increases to 38×10-6. The amorphous alloy exhibits good soft magnetic properties with low coercivity and high saturation magnetic induction. The results show that minor addition of C is beneficial to enhance the saturation magnetostriction λs, and do not deteriorate the ability of forming amorphous.     

成分对非晶态Fe—B—Si合金退火脆化行为的影响

本文研究了Ｂ和Ｓｉ的含量及Ｆｅ／（Ｂ＋Ｓｉ）相对含量对非晶态Ｆｅ－Ｂ－Ｓｉ合金退火脆化行为的影响；分析了在常规热处理条件下，利用成分的变化，获得延性与磁性综合性能的可能性。实验结果表明，非晶态Ｆｅ－Ｂ－Ｓｉ合金的退火脆化行为具有较大的成分依赖性，位于Ｆｅ７９ａｔ％－８１ａｔ％，Ｂ１１ａｔ％，Ｓｉ８ａｔ％－９ａｔ％成分范围内的Ｆｅ－Ｂ－Ｓｉ非晶态合金的退火脆化敏感性最小，脆化仍发生于晶化开始之前...     

Relationship between crystal growth mode, preferred orientation and magnetostriction of (Tb0.3Dy0.7)Fe1.95 alloys

The relationship between crystal growth mode, preferred orientation and magnetostrictive properties of (Tb0.3Dy0.7)Fe1.95 alloys was investigated at different directional solidification rates. The results showed that preferred orientation had a strong influence on the characteristics of (Tb0.3Dy0.7)Fe1.95 alloys. At lower solidification rates, the sample with <110> preferred orientation showed larger low-field magnetostriction and apparent compressive stress effect. The excessive solidification rate resulted in failure of preferred orientation and a poor magnetostrictive performance. With an increase in solidification rates, the crystal growth modes changed gradually from cellular and primary dendrite morphology to developed dendritic morphology. In addition, domain configurations were observed using magnetic force microscopy, and the change of magnetostrictive properties was interpreted in terms of revealing the domain configurations.     

Magnetostriction and hysteresis of &lt;110&gt; oriented TbDyHoFe_1.95 alloy

(Tb0.36Dy0.64)1-xHoxFe1.95 magnetostrictive alloys with <110> orientation were prepared by zone melting directionally solidified method.The magnetostrictive performance and hysteresis of <110> aligned polycrystalline(Tb0.36Dy0 64)1-xHoxFe1.95 were investigated under applied magnetic field H(0相似文献