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本文研究了不同退火温度下Fe(78.5)Cu(1.0)Nb(8.0)Si(13.5)B9纳米软磁合金的显微结构与磁性特征。结果表明:当退火温度Ta=535℃时,合金具有最佳软磁性能,其起始磁导率μi为14.8×104。合金中αFe-Si纳米晶的晶粒尺寸d及Si含量对退火温度不很敏感,当Ta=495~575℃时,d为10.65~11.87nm,Si含量为18.87~21.01at%,而非晶相的体积分数VA及短程有序范围δ则随退火温度变化较大。合金的磁性除与αFe-Si纳米晶有关外,还与合金中非晶相密切相关,在αFe-Si纳米晶的d为10.65nm、Si含量为20.56at%、非晶相的VA为0.33、δ为1.43nm下,合金具有最佳软磁性能。并用新近提出的双相无规各向异性模型分析了纳米软磁合金显微结构与磁性的关系。 相似文献
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从Hopkinson效应及X光衍射技术研究了Fe(73.5)Cu(1.0)Nb(3.0)Si(13.5)B9纳米软磁合金的居里温度特性。随晶化退火温度Ta的提高,合金中αFe-Si纳米晶相的居里温度提高,但低于相同Si含量下的常规Fe-Si合金,且与显微组织结构有关,当Ta较低时,合金中非晶相的居里温度与原始非晶合金基本相同。但其Hopeinson峰宽化,Ta>783K后,其Hopkinson4消失,无法判断居里温度。认为居里温度的上述特性与合金晶粒的小尺寸特性及元素成分分布特性有关。 相似文献
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本文测量了经不同温度和时间真空退火的非晶合金带Nd_xB_(20-x)Fe_(78)Cu_(0.3)Co_(1.7)(x=0.1,2,3,4,5),在1kHz交流电下的磁化曲线,发现含少量Nd的非晶合金带在晶化温度附近真空退火后、起始导磁率减小,饱和场增大,使材料从软磁性向硬磁性转化;随着Nd含量的增加,这种转化重明显.X射线衍射透射电镜观察及电子衍射分析表明,材料在初期晶化时能析出颗粒大小为5-100nm的针状纳米晶,且随着Nd含量增加,针状纳米晶的数量增多,这一现象与材料磁性测量的结果吻合. 相似文献
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用XRD法研究了退火Fe73.5Cu1Mo3Si14.5B8合金中α-Fe(Si)晶化相的有序化过程,结果表明,Fe73.5Cu1Mo3Si14.5B8非晶合金经460℃×1h退火后,α-Fe(Si)晶化相是具有DO3结构的有序相,有序畴为球形,直径为6.1nm,它随退火温度的升高而长大,在560℃退火后达14.0nm,与α-Fe(Si)晶粒的尺寸相当。此时,α-Fe(Si)的有序度为0.78。800℃×1h退火后,α-Fe(Si)的DO8超点阵线条消失。 相似文献
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用透射电镜和能谱仪分析了Fe73.5CU1Nb3Si13.5B9合金经不同温度退火后的组织、晶化相结构以及不同晶化相中的各元素含量变化。合金于450℃退火1h析出尺寸小于5nm的bccFe(Si)相,并且其尺寸随退火温度的升高而增大到约15nm。于600℃退火时合金中析出四方结构的Fe3B相,其晶格常数为a=0.87nm,c=0.439nm。在700℃退火时出现面心立方结构的Fe3B6相,其晶格常数a=1.039nm。在Fe(Si)相中,含有约17at%的Si,在Fe23B6中含有约11at%的Si和约4at%的Nb,而在FE3B中Si和Nb含量均很少。 相似文献
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研究了Fe_(74.5)Cu_1Nb_2Si_xB_(22.5-x)纳米晶合金中Si(B)含量的变化(x=9.5-17.5)对其结构和磁性的影响.结果表明,随着x的增高,合金的Curie温度及点阵常数皆呈线性下降.由此推定α-Fe(Si)纳米晶粒中的Si含量x_α随x增高而线性升高,并符合下列关系xα=0.626x+10.5实验结果说明,非晶态合金的λs值随x的增加而上升,但晶化后合金的λs值随x的增加而降低.在一定温度退火后的合金中,纳米晶的体积百分数Vx随x的增大而增加. 相似文献
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GU Benxi ZHAI Hongru Nanjing University Nanjing ChinaSHEN Baogen Institute of Physics Academia Sinica Beijing China 《金属学报(英文版)》1991,4(8):98-102
The magnetic properties and the crystallization and its influence on the magnetic and struc-tural properties for rapidly quenched amorphous Nd_6Fe_(81)B-(13) alloy have been studied.The lowtemperature magnetic properties,the Curie temperature and the crystallization behavior arediscussed.A small addition(6at.-%)of Nd in amorphous Fe-B alloys increases largely thecrystallization temperature T_x but causes a decrease of the Curie temperature Tc·A newphase was observed in the sample annealed at 873 K. 相似文献
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XING Feng JIANG Chao HE Wenwang Department of Physics Peking University Beijing China Originally published in ACTA METALL SIN 《金属学报(英文版)》1989,2(8):122-126
The magnetic properties of Nd_2(Fe_(1-x)M_x)_(14)B(M=C and Si) compounds have been investi-gated.Substituting Fe by small amount of metalloid C and Si atoms,the compounds are intetragonal structure and have uniaxial anisotropy.The substitution of C for part of Fe de-creases the Curie temperature of the compounds and the intrinsic coercivity of bond samples atlow temperature.The replacement of Fe by Si makes the Curie temperature increase with amaximum at the vicinity of x=0.15.When the range of the content of Si is 0≤x≤0.10,thecoercivity distinctly increases at room temperature.from 62.7 kA/m at x=0 to138.7kA/m at x=0.06,where the residual magnetization has a maximum:in the mean timethe saturation magnetization decreases only by a small amount. 相似文献
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本文研究了Nd_2(Fe_(1-x)M_x)_(14)B的磁性。少量类金属原子C和Si取代部分Fe,能形成四方结构,且具有单轴各向异性。碳取代Fe,使化合物的Curie温度降低,低温下粘结体样品的内禀矫顽力减少;而Si对Fe的取代可使Curie温度升高,并在x=0.15附近达到极大值。含Si样品在0≤x≤0.10范围内,矫顽力显著增加,室温下从x=0的62.7kA/m增加到x=0.06的138.7 kA/m,并且在x=0.06附近,剩磁有一个极值,饱和磁化强度减少不多。 相似文献
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DUO Liang XU Zuxiong MA Ruzhang Beijing University of Science Technology Beijing.China Institute of High Energy Physics Academia Sinica P.O.Box Beijing China 《金属学报(英文版)》1989,2(7):55-60
The amorphous Fe_(90-x)V_xZr_(10) alloy after electolytic hydrogenation procedure was studied bymeans of Mossbauer effect,magnetic measurement.X-ray diffaction and secondary ionmass spectroscopy(SIMS)techniques.The experimental results show that the magneticproperties of amorphous Fe_(90-x)V_xZr_(10) alloy are highly sensitive to the presence of hydrogen.The isomer shift(IS)has a small positive change and the magnetic properties transfer fromparamagnetic to ferromagnetic State by hydrogenation,and the effect of hydrogen absorptionis to raise Fe magnetic moment(from the increase of saturation maguetization)and Curietemperature T_c from 257 to 384 K.Finally.the considerable increase of magnetic properttesof amorphous Fe_(90-x)V_xZr_(10) alloy by hydrogenation is attributable to the change ofhybridization effect between outer electrons of Zr atoms and 3d electrons of Fe atoms.Fromthe results of SIMS experiment,it is concluded that the hydrogen atoms is localized aroundZr atoms wheh hydrogen atoms enter into the allor. 相似文献
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利用Mossbauer谱、磁测量技术,X射线衍射以及二次离子质谱分析(SIMS)技术,对三元非晶合金Fe_(90-x)V_xZr_(10)吸氢现象及磁性变化进行了研究.实验结果表明:随充氢时间(相同的充氢电流密度)的增加,非晶态合金同质异能移位增加,表明充氢后Fe核处电子密度发生变化.随充氢量增加,室温下合金由顺磁状态转变为铁磁状态,超精细分布逐渐展宽,其最大值也向高场方向移动.吸氢后合金原子磁矩及Curie温度T_C有大幅度增加.0K时饱和磁化强度从未充氢合金的120emu/g增加到174emu/g.Curie温度T_C从257K增加到384K.吸氢导致磁性变化的机理,利用杂化理论模型能够给出很好的解释. 相似文献
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XU Zuxiong MA Ruzhang University of Science Technology Beijing Beijing ChinaHAN Yongzhu Beijing Institute of Metallurgy Beijing China 《金属学报(英文版)》1989,2(12):434-436
Magnetic anisotropies of the amorphous alloy Fe_(71)Ni_(10)B_(13)Si_(14)C_2 annealed in magnetic fieldhave been studied using Mossbauer spectroscopy and X-ray diffraction.It is shown that thedistribution of moments in the annealed sample are determined by both stress-produced andthermomagnetic treatment-induced magnetic anisotropies. 相似文献