Fe_（76．5－x）Cu_（1．0）Nb_xSi_（13．5）B_（9．0）

研究了Ｎｂ含量ｘ对Ｆｅ＿（７６．５－ｘ）Ｃｕ＿（１．０）Ｎｂ＿ｘＳｉ＿（１３．５）Ｂ＿（９．０）纳米软磁合金的结构与磁性影响。研究结果表明，当Ｎ６含量ｘ约为３ａｔ％时，合金的软用性能最高；随Ｎｂ含量ｘ的增加，最佳软磁性能下合金显微组织结构中的αＦｅ－Ｓｉ纳米晶晶粒尺寸Ｄ、Ｓｉ含量、体积分数Ｖ＿ｃ均呈下降趋势，非晶相的短程有序范围δ增大；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。用新近提出的双相无规磁各向异性模型讨论了合金的磁性与结构的关系。     

电脉冲快速退火Fe_(73.5)Cu_1Mo_3Si_(13.5)B_9合金的组织与磁性能

采用电脉冲快速退火实现了非晶合金Ｆｅ７３．５Ｃｕ１Ｍｏ３Ｓｉ１３．５Ｂ９的纳米晶化。显微组织分析与磁性能测定结果表明,该合金经适当工艺的脉冲电流处理可得到较常规法晶粒密度更高、晶粒尺寸更小、软磁性能更优的纳米晶材料。基于随机无规磁各向异性模型,阐明了该合金的软磁性能与其显微结构的关系     

铁基非晶态合金防脆化方法研究EI

选用近共晶成分的合金和在合金中添加适量稀土元素Ｃｅ，以及用高液淬速率制备出超薄带，皆有益于降低铁基非晶合金退火脆化敏感性。用脉冲电流对铁基非晶条带进行快速加热退火，可在明显改善磁性的同时，使条带仍保持足够的变形能力；是实现铁基非晶合金磁性优化与良好延性配合的有效工艺。     

Fe73.5Cu1Mo3Si13.5B9微晶软磁合金的结构及其对磁性的影响

对Ｆｅ７３．５Ｃｕ１Ｍｏ３Ｓｉ１３．５Ｂ９微晶软磁合金的结构及其对合金磁性的影响了研究，结果表明，在最佳磁性能下，晶相点阵常数ａ＝０．２８４３ｎｍ，相当于Ｆｅ（Ｓｉ）固溶体中含Ｓｉ％（ｍｏｌ／ｍｏｌ）：１８－２０，体积百分数Ｖ＝７４．８％，晶粒尺寸Ｄ＝１４．６ｎｍ；残余非晶层厚度δ＝１．２３ｎｍ；当Ｔ退火≥５６０℃时明显有Ｆｅ－Ｂ化合物析出。Ｆｅ７３．５Ｃｕ１Ｍｏ３Ｓｉ１３．５Ｂ９合金的磁性不仅与     

电脉冲快速退火Fe73.5Cu1Mo3Si13.5B9合金的组织与磁性能

采用电脉冲快速退火实现了非晶合金Ｆｅ７３．５Ｃｕ１Ｍｏ３Ｓｉ１３．５的纳米晶化。显微组织分析与磁性能测定结果表明,该合金经适当工艺的脉冲电流处理可得到较常规法晶粒密度更高、晶粒尺寸更小、软磁性能更优的纳米晶材料。基于随机无规磁各向异性模型,阐明了该合金的软磁性能与其显微结构的关系。     

铁基非晶合金退火脆化与防脆技术

综述了铁基非晶合金退火脆化的影响因素，分析了各种防止退火脆化的方法，认为在电脉冲快速加热的同时外加磁场退火，则是改善铁基非晶合金磁性能、防止其退火脆化的一种较好的方法。     

Fe73.5Ag1.0Nb3.0Si13.5B9.0软磁合金的结构和磁性

利用Ｘ射线衍射及磁测量等方法研究了不同退火温度下Ｆｅ７３．５Ａｇ１．０Ｎｂ３．０Ｓｉ１３．５Ｂ９．０软磁合金的结构和磁性，发现Ｆｅ７３．５Ａｇ１．０Ｎｂ３．０非晶态态合金在５００℃下退火处理１ｈ后，有少量的α－Ｆｅ和南Ａｇ析出，此时的软磁性能较好，随退火温度的增加，Ｆｅ２３Ｂ６、Ｆｅ２Ｂ、Ｆｅ３Ｂ等Ｆｅ－Ｂ化合物大量析出，软磁性能急剧下降，在Ｆｅ７３．５Ａｇ１．０Ｎｂ３．０Ｓｉ１３．５Ｂ９．０非晶     

覆铜热处理对Fe80Si9B11非晶铁芯软磁性能的影响:一种改善非晶铁芯温度分布的方法

Fe基非晶合金材料是目前非晶合金中应用最广泛的体系,它具有优异的软磁性能.通过退火处理消除内应力,是提高软磁性能的关键工艺.本工作研究了以快速升温的方式进行退火处理时,Fe80 Si9 B11非晶铁芯内外缠绕铜带对其软磁性能的影响.结果表明,采用合理的非晶/铜厚度比、保温温度及时间,利用铜良好的导热性强化传热,使得温度场更均匀、非晶铁芯不同位置矫顽力差异降低,提升了非晶铁芯的初始磁导率,进而提高热处理效率和软磁性能.     

等温退火Fe_（73．5）Cu_（1．0）Mo_（3．0）Si_（13．5）B_（9．0）纳米软磁合金的磁性及其影响因素

研究了５２０℃下等温退火Ｆｅ_（７３．５）Ｃｕ_（１．０）Ｍｏ_（３．０）Ｓｉ_（１３．５）Ｂ_（９．０）纳米软磁合金的磁性，发现当退火时间ｔａ为４０ｍｉｎ时，合金的起始磁导率μｉ最高，约为５×１０~４，探讨了磁性的影响因素。     

机械球磨法制备纳米晶Fe_（73．5）Cu_1Nb_3Si_（13．5）B_9的

对Ｆｅ_（７３．５）Ｃｕ_１Ｎｂ_３Ｓｉ_（１３．５）Ｂ_９成分的母合金进行了机械球磨，并对不同时间的球磨样品进行了Ｘ射线衍射（ＸＲＤ）和Ｍｏｓｓｂａｕｅｒ谱（ＭＳ）的测量，结果表明样品难以完全非晶化，形成了无序的αＦｅ－Ｓｉ固溶体纳米晶，晶粒尺寸在５ｎｍ左右，同时共有一部分富集Ｎｂ，Ｂ元素的界面非晶相。在各种球磨条件下对αＦｅ－Ｓｉ固溶体中的Ｓｉ含量进行了计算。纳米晶Ｆｅ_（７３．５）Ｃｕ_１Ｎｂ_３Ｓｉ_（１３．５）Ｂ_９软磁合金近年来受到了广泛的重视~［１］。这种材料通常是由熔融金属急冷制成非晶薄带，然后在晶化温度以上退火制成，晶化以后在非晶基体上均匀析出１０－２０ｎｍ尺寸的αＦｅ－Ｓｉ固溶体。机械球磨或机械合金化是近些年来发展起来的一种制备亚稳态材料如非晶，纳米晶，准晶等的有效手段，有一定优越性。本文利用机械球磨探讨一种制备纳米晶Ｆｅ_（７３．５）Ｃｕ_１Ｎｂ_３Ｓｉ_（１３．５）Ｂ_９合金粉末的新途径。     

铁基纳米晶软磁合金起始磁导率的研究

论述了细化晶粒,改变合金成分,以及合理控制退火温度、时间和速度对铁基纳米晶软磁合金起始磁导率的影响及其原理.具体分析了Nb、Cu、La等在合金中的作用,确定了Si的含量要保持在14%左右.退火温度对起始磁导率有明显的影响,这种影响反映在纳米晶合金各相体积百分数的相对变化.还分析了退火时间在40min时软磁性能最佳的原因以及加快退火加热速度会显著提高合金起始磁导率的原理.     

The effect of heat-treatment in a magnetic field or under an applied stress on the magnetic properties of silicon-iron

The effects of heat-treatment in a magnetic field or under an applied stress have been studied in this investigation. Magnetic properties (magnetostriction and power loss in particular), measured along the rolling direction in grain-oriented silicon-iron were unaffected by magnetic annealing, but their stress-sensitivities were improved by annealing under tension.Magnetic annealing was found to be effective in non-oriented silicon-iron and also in grain-oriented material if it was annealed with the field applied along directions other than the rolling direction.The magnetic annealing results can be explained largely on the basis of the Néel-Taniguchi theory of directional ordering of atom pairs. The changes obtained by annealing under stress showed that directional order only plays a minor part. The magnetic changes could be explained by assuming that during heat-treatment under stress a process of magnetostriction strain relief occurs, forming a residual internal stress.Other alloys similar to silicon-iron showed no more response to magnetic annealing or annealing under stress than silicon-iron.     

A new method for stress relieving amorphous alloys to improve magnetic properties

An analysis of the kinetics of stress relief annealing in amorphous alloys, with particular emphasis on the effect of annealing on the resulting magnetic properties, is made. Based on this analysis, an optimal procedure for annealing amorphous alloy magnetic cores is suggested. It involves a fast heatup to a high temperature for a short time. The expected benefits of this procedure are decreased embrittlement, lower strain induced anisotropy, and lower residual stresses. The conventional technique for stress relieving magnetic cores proved unsuitable for the application of the new annealing treatment. A new technique was devised in which the ribbon is dynamically annealed as it is wound onto the core. The magnetic properties of the resulting toroids are superior to those produced by the conventional technique.     

Effects of shear bands in glassy alloy ribbons on some magnetic properties

Metallic glasses deformed in an inhomogeneous manner show degradation of structure-sensitive soft magnetic properties. Ribbons of different magnetostriction have been magnetically measured in the as-cast and in the cold-rolled state. Subsequent isochronal annealing and retesting indicates that recovery of magnetic properties may be rationalized on the basis of competition between stress relief and incipient crystallization, both of which occur during annealing. The minimum coercivity to which an inhomogeneously deformed sample may be annealed is limited primarily by magnetostriction and thermal stability of a particular metallic glass. Stress relaxation and Curie temperature measurements suggest the creation of free volume during the formation of shear bands.     

Effect of thermomechanical treatment on the properties of Fe-11Al and Fe-14Al alloys

Fe-Al alloys have the potential to be relatively inexpensive soft magnetic materials if their formability could be improved. An investigation has been made on the effect of thermomechanical treatment on the properties of Fe-11 wt%Al and Fe-14 wt%Al alloys (designated Fe-11Al and Fe-14Al respectively). For the former the room temperature mechanical properties were found to be determined principally by the recrystallised grain size. A good combination of properties for Fe-11Al, i.e. high strength and ductility, was obtained when the grain size was less than about 100 m. The small grain size was produced by warm rolling at 600°C followed by 1 hour annealing at 600–700°C. On the other hand hot rolling followed by annealing resulted in large grain size, hence rendered the alloy brittle. The cold formability also exhibited a grain size dependence, with the Fe-11Al alloy with a fine recrystallised grain size having good cold rollability. In contrast Fe-14Al was brittle irrespective of the treatment given; ductility of less than 1% was observed in all cases and the cold rollability was limited. Ordering was not seen to be a factor affecting the observed mechanical properties and rollability of either alloy as all the thermomechanical treatments, other than an ordering treatment of 500 hours at 400°C, resulted in a disordered structure. The stress required to work these alloys at elevated temperatures were estimated from compression tests and it is apparent that for Fe-11Al the stress is greatly reduced (50%) from the room temperature value at 600°C and that at 750°C both alloys required a similar stress which was about 15% of the room temperature value. The magnetic properties of Fe-11Al compared favourably with Fe-14Al; the former has a higher saturation induction, a similar coercive force but a lower permeability than Fe-14Al.     

低温应力退火Fe基合金薄带巨磁阻抗特性的研究

通过同步辐射X射线衍射技术,观测Fe73.5Cu1Nb3Si13.5B9非晶薄带经过不同温度和不同应力退火60 min后样品的微观结构,利用HP4294A型阻抗分析仪测量相应样品的巨磁阻抗比与磁各向异性。研究结果表明,在450℃下施加不同应力退火的样品仍然处于非晶结构状态,并且在应力为112.1 MPa的条件下产生优异的磁性能,样品的最大巨磁阻抗比达到了1818.7%,是自由退火条件下最大巨磁阻抗比的1.9倍,同时能够改变巨磁阻抗曲线的形状,使Fe基合金薄带的巨磁阻抗曲线具有宽线性的特性。对实验数据进行拟合后发现,样品的最大巨磁阻抗比和磁各向异性场与外加应力都具有线性关系,磁感灵敏度与外加应力具有负指数关系。通过探究发现具有非晶结构的Fe基合金薄带的磁学性能对应力敏感,可以作为研究非晶纳米晶合金材料应力敏感问题的另一个新方向。     

张力退火感生各向异性对纳米晶合金磁性能的影响

对Fe_74.1Cu₁Nb₃Si₁₅B_6.9(%,原子分数)纳米晶合金进行连续张力退火,研究了张力退火感生各向异性对纳米晶合金磁性能的影响。结果表明,张力退火产生的感生各向异性常数(K_u)与退火张力(σ)满足线性关系。随着退火张力的增大合金在f =5 kHz和H=3 A/m测试点的有效磁导率(μ_e)先增大后减小,且随着磁场和频率的提高有效磁导率(μ_e)的衰减减小。退火张力为67 MPa时有效磁导率(μ_e)在磁场强度H为0~800 A/m和频率f为1 k~3 MHz范围内保持约800,表现出恒导磁特性。同时,合金的单位质量损耗(P_m)随着退火张力的增大而减小,当退火张力为67 MPa时损耗为68 W/kg (测试条件：B_m=300 mT,f =100 kHz),与无张力退火相比下降约67%。同时,通过磁光克尔效应观察到张力退火后合金内部形成垂直于张力方向的180°片形畴,随着退火张力的增大磁畴宽度减小且趋于一致,退火张力为67 MPa时片形畴的宽度约为85 μm。