共查询到19条相似文献,搜索用时 218 毫秒
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研究了基于Fe73.5Cu1Nb3Si13.5B9非晶/纳米晶粉的柔性压磁复合材料制备技术及其性能, 讨论了橡胶种类, 磁粉粒径、含量及工艺因素等对Fe73.5Cu1Nb3Si13.5B9/橡胶复合材料压磁性能的影响. 结果表明: 采用粒径为45 μm, 用量约15%的Fe73.5Cu1Nb3Si13.5B9非晶/纳米晶粉与高温硫化有规共聚硅氧烷在171 ℃, 15 Mpa条件下, 硫化45 min制备的、厚度约150 μm的压磁复合材料薄膜具有较好的应力敏感特性和压磁稳定性能, 有望作为新一代柔性、薄型接触应力传感器的敏感元件材料. 相似文献
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本文研究了金属玻璃2605SC(Fe_(81)B_(13.5)Si_(3.5)C_2)及2605(Fe_(80)B_(20))的差热分析与输运性能。由此可见,作为非晶铁磁材料,与2605相比下,2605SC更为稳定,2605SC的最终平衡相出现是Fe_2B与a-Fe,而2605的最终平衡相却是Fe_3B与a-Fe。2605SC分二步晶化,而2605则是一步晶化。由差热分析支持了上述结论即2605SC出现二个晶态峰,而2605仅出现一个主峰。由于B被Si与C部分置换从而使2605SC的晶化温度及激活能有所提高,从而增加了它的稳定性。2605SC具有较高的电阻率及较低的电阻率的温度系数也证明了2605SC较2605更为稳定。 相似文献
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在较低激光功率(40~170 W)和两种扫描速度(10mm/s,5mm/s)辐照条件下,研究了CO2激光辐照工艺对非晶Fe73.5Cu1Nb3S13.5B9合金晶化行为的影响.用穆斯堡尔谱(MS)技术对原始态和晶化后样品进行了结构分析.研究发现:非晶Fe73.5Cu1Nb3S13.5B9表面产生了少量晶化,晶化相为Fe-Si结构;晶化量在2.1%~3.57%内,随激光功率的增加而增加.当激光功率较低时,低扫描速度对晶化的促进作用大于激光功率的作用;但是,随激光功率增大,速度的影响变弱.表面微观硬度随激光功率的增加而增加. 相似文献
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采用不同的淬速(辊速Vs=10,15,20,25,30 m·s-1)制备了Nd_9Fe_(70)Ti_3C_1Nb_3B_(14)合金快淬薄带,并研究了薄带的晶化相变及其退火后的磁性能随快淬速度提高而发生的变化。结果表明:在淬速15和20 m·s-1之间有一个临界淬速,在临界淬速以下制备的低淬速薄带由非晶和少量Nd_2Fe_(14)B,Fe3B和α-Fe纳米晶组成,而在临界淬速以上制备的高淬速薄带由完全非晶构成。随着淬速的提高,薄带中非晶的热稳定性逐步提高。低淬速薄带晶化过程的相变为AP+Nd_2Fe_(14)B+Fe_3B+α-Fe→Nd_2Fe_(14)B+Fe_3B+α-Fe+Nd_3Fe_(20)B_2→Nd_2Fe_(14)B+Fe_3B+α-Fe,而高淬速薄带晶化过程的相变为AP→AP'+Nd_3Fe_(20)B_2→Fe_3B+Nd_3Fe_(20)B_2→Nd_2Fe_(14)B+Fe_3B+α-Fe。优化退火后,尽管不同淬速薄带的剩磁差别不大,但低淬速薄带的最佳矫顽力和磁能积分别比高淬速薄带的高28.41%和20.12%。 相似文献
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《稀土》2017,(3)
对边界结构改性对磁体的显微组织结构和磁性能以及温度特性的影响进行了研究。设计了第一主相磁粉合金成分Nd_(24)Pr_6Co_(1.8)Fe_(61.1)Nb_(0.6)Al_(0.30)Cu_(0.2)B_(1.0),第二边界区结构合金成分Dy_(30)Fe_(68.2)Nb_(0.6)Al_(0.3)Cu_(0.2)B_(1.0),第三晶界相合金成分Nd_(40)Pr_(10)Fe_(47)Cu_(2.0)B_(1.0)。发现边界结构改性可以在基本不影响或者很小影响剩磁的前提下大幅度提高矫顽力。边界结构改性工艺主要是使重稀土元素Dy通过晶界扩散进入到Nd2Fe14B主相晶粒边界区而不是晶粒芯部,在Nd_2Fe_(14)B主相晶粒边界区形成具有高磁晶各向异性场的(Nd,Dy)_2Fe_(14)B壳层结构,从而达到大幅度提高矫顽力的目的。 相似文献
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采用气雾化制备了Fe_(36)Co_(36)B_(20)Nb_4Si_4合金粉末,利用大气等离子喷涂在H62铜板和铝管表面制备了厚度约为0.2~0.3 mm的非晶合金涂层。结果表明:Fe_(36)Co_(36)B_(20)Nb_4Si_4合金涂层几乎为完全的非晶态结构,涂层硬度高达1 200 HV,喷涂有Fe_(36)Co_(36)B_(20)Nb_4Si_4涂层的样品对直流磁场和高频电磁场均具有良好的屏蔽性能,在800 A/m直流磁场下屏蔽效能为25 dB,在300 kHz~1.5 GHz频段屏蔽效能约为80 dB。 相似文献
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The surface nanocrystallization of amorphous Fe73.5 Cu1Nb3Si13.5B9 radiated by CO2 laser was studied by means of M(oe)ssbauer spectroscopy, transmission electro iroscope and X-ray diffraction. The result shows that under certain technical conditions, nanocrystalline is fiound on the surface of amorphous Fe73.5 Cu1Nb3Si13.5B9 radiated by laser; the crystallization phase is α-Fe(Si) crystalline, and its size is about 10-20 nm; the nanocrystalline is uniformly distributed on amorphous base to keep the amorphous and crystallized phase in balance; the a mount of crystallization reaches 23% when the laser power is 300 W, the diameter of light spot is 20 mm, and the radiation speed is 20 mm/s. The phase balance can be controlled by adjusting the laser technology parameter. Laser radiation on the amorphous Fe73.5 Cu1Nb3Si13.5B9 alloy is an important technique for surface nanocrystallization of the amorphous alloys. 相似文献
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SincethenanocrystallinesoftmagneticalloyFe73 .5Cu1Nb3Si13 .5B9withexcellentsoftmagneticpropertieswasdevelopedbyYoshizawaYetalin1988[1] ,itsmagnetictheory ,chemicalcomposition ,preparationtechnology ,structureandtransitionaswellasspreadingapplicationwerestudiedexte… 相似文献
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Guo-Hao Chen C. Suryanarayana F. H. Sam Froes 《Metallurgical and Materials Transactions A》1995,26(6):1379-1387
Ti-Al-Nb ternary powder mixtures containing 24Al-11Nb, 25Al-25Nb, 37.5Al-12.5Nb, and 28.5Al-23.9Nb (at. pct) were mechanically
alloyed in a SPEX 8000 mixer mill using a ball-to-powder weight ratio of 10:1. The structural evolution in these alloys was
investigated by X-ray diffraction and transmission electron microscopy techniques. A solid solution of Al and Nb in Ti was
formed at an early stage of milling, followed by the B2/body-centered cubic (bec) and amorphous phases at longer milling times.
The stability of these phases and their transformation to other phases have been investigated by heat treating these powders
at different temperatures. The B2/bcc phase transformed into an orthorhombic (O-Ti2AlNb) or a mixture of the orthorhombic (O) and hexagonal close-packed (α2-Ti3Al) phases, the proportion of phases being dependent on the powder composition. Milling beyond the amorphous phase formation
resulted in the formation of an fee phase in all the powders, which appears to be TiN, formed as a result of contamination
of the powder.
Formerly Graduate Student, University of Idaho 相似文献
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用Zr,Al,Ni和Cu的元素粉末,采用机械合金化的方法在转速为400 r/min、球料质量比20:1的条件下制备具有非晶结构的Zr50Al15 Ni10Cu25粉末,研究其非晶化机制。用X射线衍和扫描电镜分析粉末的结构、晶粒尺寸和形貌。结果表明:在球磨8 h后可使Zr50Al15 Ni10Cu25混合粉末非晶化,晶粒尺寸约80 nm;球磨过程中并没有出现任何过饱和固溶体或者中间合金相,非晶化过程是由于球磨过程中球磨罐和磨球对粉末的不断冲击、剪切、摩擦和挤压,使混合粉末中的晶粒极度细化而直接转变为非晶态颗粒,得到非晶粉末。 相似文献
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Casey Smith Shravana Katakam Soumya Nag Y. R. Zhang J. Y. Law Raju V. Ramanujan Narendra B. Dahotre Rajarshi Banerjee 《Metallurgical and Materials Transactions A》2014,45(7):2998-3009
The role of the solute elements, copper, and niobium, on the different stages of de-vitrification or crystallization of two amorphous soft magnetic alloys, Fe73.5Si13.5B9Nb3Cu1, also referred to as FINEMET, and a Fe76.5Si13.5B9Cu1 alloy, a model composition without Nb, has been investigated in detail by coupling atom probe tomography and transmission electron microscopy. The effects of copper clustering and niobium pile-up at the propagating interface between the α-Fe3Si nanocrystals and the amorphous matrix, on the nucleation and growth kinetics have been addressed. The results demonstrate that while Cu clustering takes place in both alloys in the early stages, the added presence of Nb in FINEMET severely restricts the diffusivity of solute elements such as Cu, Si, and B. Therefore, the kinetics of solute partitioning and mobility of the nanocrystal/amorphous matrix interface is substantially slower in FINEMET as compared to the Fe76.5Si13.5B9Cu1 alloy. Consequently, the presence of Nb limits the growth rate of the α-Fe3Si nanocrystals in FINEMET and results in the activation of a larger no. of nucleation sites, leading to a substantially more refined microstructure as compared to the Fe76.5Si13.5B9Cu1 alloy. 相似文献
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在高纯氩气保护下采用高能球磨法对原子组成为Fe44Co44Zr3.5Nb3.5B4Cu1的混合粉末进行机械合金化(MA)实验,成功地制取了非晶合金粉末.利用X射线衍射(XRD)、扫描电镜(SEM)、差热分析(DTA)对其进行测试,结果表明:Fe-Co系的混合粉末在MA过程中,通过原子之间的相互固溶、扩散可形成非晶态.此非晶合金的形成是晶粒细化、球磨过程中的缺陷、应力和致密堆垛结构等多种因素综合作用的结果,这与机械合金化的合成机理之一的扩散型机制相吻合.用非晶化的热力学条件判据和动力学条件判据对此合金进行计算,其结果也表明此合金已非晶化. 相似文献
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To study the thermal expansion of amorphous Fe Si B alloys, the amorphous Fe78Si9B13 and Fe735Nb3 Cu1Si135B9 and their crystallized alloys were detected using thermal dilatometer. The results indicate that at the same temperature, the relative length change (ΔL/L0) values of the two Fe based amorphous alloys decrease with increasing heating rate, but those of their crystallized alloys show an opposite trend. It is concluded that the effect of heating rate on the ΔL/L0 of amorphous and crystallized alloys is related to free volume and defects, respectively. 相似文献
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D. K. Mukhopadhyay C. Suryanarayana F. H. FROES 《Metallurgical and Materials Transactions A》1995,26(8):1939-1946
The structural evolution in mechanically alloyed binary aluminum-iron powder mixtures containing 1, 4, 7.3, 10.7, and 25 at.
pct Fe was investigated using X-ray diffraction (XRD) and electron microscopic techniques. The constitution (number and identity
of phases present), microstructure (crystal size, particle size), and transformation behavior of the powders on annealing
were studied. The solid solubility of Fe in Al has been extended up to at least 4.5 at. pct, which is close to that observed
using rapid solidification (RS) (4.4 at. pct), compared with the equilibrium value of 0.025 at. pct Fe at room temperature.
Nanometer-sized grains were observed in as-milled crystalline powders in all compositions. Increasing the ball-to-powder weight
ratio (BPR) resulted in a faster rate of decrease of crystal size. A fully amorphous phase was obtained in the Al-25 at. pct
Fe composition, and a mixed amorphous phase plus solid solution of Fe in Al was developed in the Al-10.7 at. pct Fe alloy,
agreeing well with the predictions made using the semiempirical Miedema model. Heat treatment of the mechanically alloyed
powders containing the supersaturated solid solution or the amorphous phase resulted in the formation of the Al3Fe intermetallic in all but the Al-25 at. pct Fe powders. In the Al-25 at. pct Fe powder, formation of nanocrystalline Al5Fe2 was observed directly by milling. Electron microscope studies of the shock-consolidated mechanically alloyed Al-10.7 and
25 at. pct Fe powders indicated that nanometer-sized grains were retained after compaction. 相似文献
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《Acta Metallurgica Materialia》1992,40(9):2137-2147
The microstructure evolution in the course of crystallization of a splat-quenched Fe73,5Si13.5B9Nb3Cu1 amorphous alloy was investigated by atom probe field ion microscopy (APFIM) and high resolution transmission electron microscopy (HRTEM). All the alloying elements were found to be distributed homogeneously as an amorphous solid solution in the as-quenched state. At an initial stage of annealing, a concentration fluctuation of Cu was found to occur. Cu formed clusters of a few nanometer diameter and their composition was found to be approximately 30 at.% Cu at the beginning. In the later stage, a b.c.c. FeSi solid solution and the B and Nb enriched amorphous phase with the smaller Si content were found to coexist. In addition to these two phases, Cu enriched particles containing approximately 60 at.% Cu were found to be present in the intergranular regions, although we were not successful yet to determine whether this was a crystalline or amorphous phase. Based on these observations, we discuss the crystallization process of this alloy at 550°C which leads to the emergence of excellent soft magnetic properties. 相似文献