具有高磁感低矫顽力的Fe-Co-B合金

正F.Wang和A.Inoue等人研制了(Fe_(1-x)Co_x)_(83)B_(16)Si_1(x=0.1~0.3)非晶带,经T_(x1)~120K和T_(x1)~40K温区退火处理,T_(x1)是第一次放热晶化峰的起始温度。研究结果表明,当x=0.2时,得到最佳软磁特性,即     

初期晶化对金属玻璃(Fe_(1-x)Co_x)_(78)Si_(10)B_(12)磁化强度的影响

文献[1]曾对金属玻璃(Fe_(1-x)Co_x),_(78)Si_(10)B_(12)的晶化,作过X射线衍射和透射电镜研究,指出初期晶化相为相应晶态Fe_(1-x)Co_x的室温平衡相.本工作将在验证这一结论的基础上,研究初期晶化对一定磁场强度下磁化强度(定场磁化)的影响。一、样品和实验方法成分为(Fe_(1-x)Co_x)_(78)Si_(10)B_(12)(x=0.1,0.5,0.7,1)的合金用单辊快淬法制成截面为～1×0.3mm的金属玻璃窄带,用示差扫描热分析法测定其晶化温度T_(cr)(升温速率10℃/min)分别为505,490,440和420℃.磁性试样在石英管式炉中依次进行退火,退火温度T_a=350-500℃,除了x=0.7的样品在T_a≥450℃退火10min外,T_a≤450℃退火20min,     

EFFECT OF INITIAL CRYSTALLIZATION ON MAGNETIZATION OF METALLIC GLASSES(Fe_(1-x)Co_x)_(78)Si_(10)B_(12)

<正> 文献[1]曾对金属玻璃(Fe_(1-x)Co_x),_(78)Si_(10)B_(12)的晶化,作过X射线衍射和透射电镜研究,指出初期晶化相为相应晶态Fe_(1-x)Co_x的室温平衡相.本工作将在验证这一结论的基础上,研究初期晶化对一定磁场强度下磁化强度(定场磁化)的影响。 一、样品和实验方法 成分为(Fe_(1-x)Co_x)_(78)Si_(10)B_(12)(x=0.1,0.5,0.7,1)的合金用单辊快淬法制成截面为～1×0.3mm的金属玻璃窄带,用示差扫描热分析法测定其晶化温度T_(cr)(升温速率10℃/min)分别为505,490,440和420℃.磁性试样在石英管式炉中依次进行退火,退火温度T_a=350-500℃,除了x=0.7的样品在T_a≥450℃退火10min外,T_a≤450℃退火20min,     

EFFECT OF MAGNETIC FIELD-AND TENSIONANNEALING ON MAGNETIC PROPERTIES OF AN Fe_(78)Si_(10)B_(12) METALLIC GLASS

通过磁场和张力退火对金属玻璃Fe_(78)Si_(10)B_(12)磁导率影响的研究,发现存在磁化感生和应变感生的两种磁各向异性,二者分别具有正值和负值的各向异性常数。     

机械合金化合成Fe_(81)Si_9B_6Nb_3Cu_1粉末

利用纯组元元素通过机械合金化合成纳米尺度的Ｆｅ８ｌＳｉ９Ｂ６Ｎｂ３Ｃｕ１合金粉末,研究了经不同时间（２～７０ｈ）研磨的产物的结构和磁性。Ｘ射线衍射、中子衍射和穆斯堡尔测量指出,随研磨时间延长逐渐地形成了无序固溶体,其平均颗粒尺寸处于纳米级范围。长时间研磨的样品显示出超细的非化学计量的晶体相、经长时间研磨的粉末样品,其矫顽力要比成分相似、局部晶化的金属玻璃的高。这种样品经过９７３Ｋ退火产生了Ｆｅ３Ｓｉ晶相和少量的硼化物和Ｆｅ－Ｎｂ聚集物。机械合金化合成Fe_(81)Si_9B_6Nb_3Cu_1粉末…     

磁场和张力退火对金属玻璃Fe_(78)Si_(10)B_(12)磁性的影响

通过磁场和张力退火对金属玻璃Fe_(78)Si_(10)B_(12)磁导率影响的研究,发现存在磁化感生和应变感生的两种磁各向异性,二者分别具有正值和负值的各向异性常数。     

矩形脉冲电流退火与激励电流对Co基非晶带巨磁阻抗效应的影响

利用矩形脉冲电流对Co_(66.3)Fe_(3.7)Si_(12)B_(18)非晶带进行退火处理,研究了退火电流密度对非晶带巨磁阻抗效应的影响,同时研究了激励电流频率对退火处理后的非晶带巨磁阻抗效应的影响。结果表明,该非晶带的特征频率为1.4 MHz。最大巨磁阻抗所对应的磁场随激励电流频率的增加逐渐向高磁场方向移动。     

MAGNETIC PROPERTY AND THERMOSTABILITY OF Fe-BASE AMORPHOUS ALLOYS WITH HIGH SATURATION MAGNETIZATION

非晶态Fe_80B_(20),Fe_(17.84)B_(16.81)Si_(3.49)C_(1.36),Fe_(65.66)Co_(17.3)B_(15.84)Si_(1.2)和Fe_(6(?).92)Co_(17)B_(19.29)Si_(1.59)C_((?).(?))P_((?).(?))合金用单辊急冷法制备.测量了饱和磁化强度与温度的关系.得到0K时的原子磁矩(?)都在2.03—2.07μ_B之间.非晶态Fe_(80)B_(20)和Fe_(77.84)B_(16.81)Si_(3.49)C_((?).(?))合金的室温饱和磁化强度σ_s(R.T.)和Curie温度Tc相近,而含Co样品的σ_s(R.T.)和T_c分别高于Fe_(80)B_(20)约6%和13%.由热磁、电阻率、差热分析和X射线衍射的测量结果分析了样品的晶化转变.含Co样品的晶化温度T_(cr)与Fe_(80)B_(20)相近,而Fe_(77.84)B_(16.81)Si_(3.49)C_(1.86)的T_(cr)高于Fe_(80)B_(20)约80K.用化学键、T_(cr)与e/α的关系以及晶化过程的复杂性讨论了影响高饱和非晶态合金稳定性的因素.     

退火温度与时间对Co46Fe20B23.5Si4.5Nb6非晶合金软磁性能的影响

采用铜模吸铸法成功制备了直径为1 mm的Co_(46)Fe_(20)B_(23.5)Si_(4.5)Nb_6非晶棒材,随后在570～800℃对该非晶合金进行等温退火处理,研究退火温度及时间对其晶化行为及软磁性能的影响。结果表明:Co_(46)Fe_(20)B_(23.5)Si_(4.5)Nb_6非晶合金的玻璃转化温度(T_g)为582.95℃,第一次晶化温度为(T_x)为636.53℃,过冷液相区(ΔT)为53.58℃。铸态Co_(46)Fe_(20)B_(23.5)Si_(4.5)Nb_6非晶合金具有良好的软磁性能,其饱和磁化强度为74.82 emu/g,矫顽力为3.34 G。经过570℃或620℃退火,非晶合金的软磁性能得到明显提高,其中在620℃退火保温5 min后合金得到最大的饱和磁化强度(79.51 emu/g)和最小的矫顽力(1.02 G),具有最优的软磁性能。     

退火工艺对Fe_(91.63)B_(1.27)Si_(7.09)非晶带材腐蚀性能的影响

采用真空电弧炉铜模铸造法制备出Fe_(91.63)B_(1.27)Si_(7.09)非晶带材,并用失重法对比研究了非晶带材在HCl、H_2SO_4溶液里的腐蚀行为;采用X射线衍射仪和光学显微镜对该非晶带材的相组成、晶化过程及试样的腐蚀形貌进行了研究,并综合分析了退火工艺对Fe_(91.63)B_(1.27)Si_(7.09)非晶带材耐腐蚀性能的影响。结果表明:Fe_(91.63)B_(1.27)Si_(7.09)非晶带材在20%H2SO_4溶液中的耐蚀性比45钢高300倍。非晶合金晶化程度随退火温度升高而提高,带材的腐蚀速率取决于退火温度。在500℃以下退火时,Fe_(91.63)B_(1.27)Si_(7.09)非晶带材腐蚀速率变化不大;在500℃以上退火时,Fe_3Si相和Si_4Cu_(15)相析出,腐蚀速率明显增大;当退火温度上升到700℃时,已由非晶态完全转变成晶态,腐蚀速率大幅度提高。     

BRITTLE-DUCTILE TRANSITION OF ANNEALEMBRITTLED Fe_(75)Si_(10)B_(15)METALLIC GLASS

Studies were made of the effect of mechanical pulverization on relaxation,crystallizationand brittle-ductile transition of the anneal-embrittled Fe_(75)Si_(10)B_(15) metallic glass rib-bon.Results show that the Curie temperature,T_C,decreases and the total enthalpy ofrelaxation increases gradually with variation of pulverized time.DSC traces reveal anextra exothermic peak,T_X_1,and a distinct glass transition endothermic peak,T_g_1,withincreasing pulverized time,T_C,T_X_1,and T_g_1 decrease simultaneously,and the exother-mic peak area corresponding to T_X_1 increases gradually.The surface slip-steps of flakyparticles and their corresponding shear are produced by pulverizing the pre-embrittledamorphous glass.The lost ductility of the glass may restore during annealing.     

APPROACH TO TRANSITION OF NON-CRYSTALLINE METAL GLASSES WITH AID OF METHOD OF POLYMER TRANSITION RESEARCH

对某些金属和类金属按一定比例在高温下熔融混合,并急速冷却,可以得到性能极为特殊的非晶态金属。我们根据高聚物转变理论,用研究高聚物的扭辫仪、线膨胀仪,再结合DSC和X射线衍射仪,对非晶态金属[Fe_(0.1)Ni_(0.35)Co_(0.55)]_(78)Si_8B_(14),[Fle_(0.1)Ni_(0.30)Co_(0.55)Mo_(0.05)]_(78)Si_8B_(14)和[Fe_(0.1)Ni_(0.30)Co_(0.55)Nb_(0.05)]_(78)Si_8B_(14)的玻璃化转变及晶化转变的自由体积、激活能、内耗与热效应等进行了研究,观测到玻璃化温度及晶化温度、玻璃化转变激活能及晶化激活能均与合金元素原子半径有关,转变时的热效应与内耗峰值有一定的对应关系。讨论了玻璃化转变及晶化转变的机理,可供设计非晶态金属时参考。     

DISACCOMMODATION OF INITIAL SUSCEPTIBILITY IN AMORPHOUS Fe_(90-x)Ni_xZr_(10) ALLOYS

The disaccommodation(DA)measurements of initial susceptibility were performed inamorphous Fe_(90-x)Ni_xZr_(10)(x=10,20,30)alloys.The DA was measured for two differentamorphous states:as-quenched and pretreated at 537 K for 45 min.For all the as-quenched samples,in the isochronal spectra of DA a well defined relaxation peak around350 K is accompanied by a samll but distinct peak near the Curie temperature ofFe_(90)Zr_(10) phase(T_c=230 K).The reversibility and annealing effect on DA are analyzedwithin the framework of two-level model.The fits of the theory to the experimentaldata of reversible relaxation processes gave a spectrum,of activation energies and pre-exponential factor.     

Weldalite~(TM)210合金的拉伸性能与显微组织

通过显微硬度测试、拉伸实验和透射电镜观察,研究不同热处理状态(T6、T8)和微量Zn的添加对Weldalite~(TM)210Al-Li合金显微组织和拉伸性能的影响.结果表明:Weldalite~(TM)210Al-Li合金具有很高的强度,在T6状态下,该合金的主要析出强化相是θ'相、δ'相和T_1相;而在T8状态下,其主要强化相是δ'相和T_1相,预变形促进T_1相的析出,提高T8状态下合金的时效强化效果;微量Zn的添加明显促进T_1相的析出和弥散分布,使合金强度提高,但Zn的加入使合金塑性略有下降.     

INFLUENCE OF RARE-EARTH ELEMENTS ON THERMAL STABILITY OF PdSi_(16.5)GLASS

The influence of rare-earth elements,La,Ce,Pr,Nd,Sm,Eu,Gd,Dy,Ho,Er and Yb onthe thermal stability of PdSi_(16.5) glass was studied systematically by means of DSC.Allrare-earth elements,especially heavy ones,increase obviously the thermal stabilityparameters,including T_θ(T_g ,T_x ,T_g),T_(rg) and ΔE etc.The crystallization temperaturesT_(p1) and T_(p2) increase linearly with the lanthanide constriction increasing,but Eu shows ananomalous influence:Pd-Si-Eu metallic glass possesses the highest thermal stability and thelowest concentration limit of glass forming among Pd-Si-R glasses.     

稀土材料La—Ba—（Mn,Fe）—O的磁电输运特性探讨

研究制备了Ｌａ０．６７Ｂａ０．３３Ｍｎ１－ｘＦｅｘＯ３（ｘ＝０,０．０５,０．１）材料。结果表明：铁替换锰降低了材料的饱和磁化强度及居里温度,主要是因为Ｆｅ离子不参加双交换作用,同时Ｍｎ＾３＋－Ｏ＾３－Ｍｎ＾４＋的作用对随铁离子替代Ｍｎ＾３＋而数量减少,材料的铁磁作用随之减弱。铁替换降低了金属－半导体转换峰温度,相应提高了材料的零场电阻值。值得注意的是铁掺杂提高了大磁阻材料Ｌａ０．６７Ｂａ０．３３Ｍｎ１－ｘＦｅｘＯ３的低温性能,５Ｋ下磁阻比「Ｒ（６Ｔ）－Ｒ（０）」Ｒ（０）从ｘ＝０时的－４０％增加到ｘ＝０．１时的－６０％。本文同时利用迪尼模型对材料大磁阻效应进行了计算分析,发现理论计算曲线可以较好的反映实验上出现的金属－半导体转换峰现象,同时负的大磁阻效应现象也可从理论计算上得到证实。     

HEAT CAPACITIES OF Fe_（40）Ni_（40）B_（20） GLASSY ALLOY MEASURED BY ENTHALPY METHOD

ＨＥＡＴＣＡＰＡＣＩＴＩＥＳＯＦＦｅ_（４０）Ｎｉ_（４０）Ｂ_（２０）ＧＬＡＳＳＹＡＬＬＯＹＭＥＡＳＵＲＥＤＢＹＥＮＴＨＡＬＰＹＭＥＴＨＯＤ￥ＪＩＡＮＧＱｉｎｇ;ＺＨＡＯＭｉｎｇ;ＬＩＪｉａｎｃｈｅｎ（ＪｉｌｉｎＵｎｉｖｅｒｓｉｔｙｏｆＴｅｃｈｎｏｌ?..     

Zr_(47)Cu_(44)Al_9大块非晶合金的变温晶化行为

利用示差扫描量热仪(DSC)研究了Zr_(47) Cu_(44)Al_9大块非晶合金在连续升温过程中的的变温晶化行为.利用Kissinger方法计算其特征温度表观激活能,利用Doyle方法计算其局域激活能.结果表明,Zr_(47) Cu_(44)Al_9大块非晶合金具有良好的热稳定性.利用Kissinger方法计算得到的其玻璃转变激活能E_g为390.2kJ/mol、晶化激活能E_x为325.1kJ/mol、晶化峰值的激活能E_p为299.5kJ/mol.随着加热速率的提高,各特征温度值向高温端移动,其晶化峰值温度所对应的晶化体积分数减小.局域激活能随着非晶晶化体积分数的增加而逐渐减小.     

INFLUENCE OF TRANSITION METALS OF THIRD LONG PERIOD ON THERMAL STABILITY OF PdSi_(16.5) GLASS

用DSC和DTA测定了淬火态和退火态Pd_(83.5-x)MzSo_(15.6)非晶态合金一系列热稳定性参数:T_g,T_x,T_p,T_m,T_(liq),T_(rg),玻璃转变和结晶激活能ΔE,结晶热ΔH_c,Twyman常数等。发现前过渡金属Hf,Ta,W,Re显著地提高两种状态非晶态合金的热稳定性,后过渡元素Os,Ir,Pt,Ru,Rh对热稳定性影响较小。用Gaskell模型和Engel-Brewer过渡金属电子理论解释了前、后过渡金属对PdSi_(16.5)非晶态合金热稳定性的不同影响。     

MOSSBAUER EFFECT STUDY OF YBa_2Cu_(3-x)Sn_xO_(7-y)SYSTEM

M(?)ssbauer spectra measurements reveal that Sn exists in YBa_2Cu_(3_x)Sn_xO_(7_y) system(x=0.05,0.10,0.20,0.30 and 0.40)in form of Sn~(4+) and occupies Cu(1)and Cu(2)sites.Therelative rate at which Sn~(4+) occupies Cu(1)or Cu(2)sites varies with x.The superconductivitytransition temperature,T_c,depresses slightly due to the substitution of Cu for Sn.