W对烧结NdFeB磁体的显微组织和磁性能的影响

主要研究了在烧结ＮｄＦｅＢ磁体的晶界添加Ｗ对显微组织和磁性能的影响，实验结果表明，随Ｗ添加量的增大，晶粒逐渐细化，剩磁稍有下降，面矫顽力逐渐升高，在含Ｗ为１％ｗｔ时，矫顽力达到峰值。扫描电镜的观察显示，加Ｗ磁体在晶界区生成许多杆状相，能谱和Ｘ线射线衍射分析均表明此相为ＷＦｅＢ化合物。     

退火及成分对Co-C纳米复合薄膜磁性能的影响

用磁控溅射方法制备了Co含量介于13.0%～24.6%（原子分数）的Co-C纳米复合薄膜,在真空下对薄膜进行退火处理。测试了样品在5、77和300K下的磁化曲线,详细研究了退火及成分对薄膜微结构和磁性能的影响。结果表明未经退火的样品磁性较弱,退火之后样品磁性能增强,低Co含量的薄膜经退火后呈现出低温铁磁性、室温超顺磁性的颗粒薄膜特征。随着Co含量增加,薄膜的磁化强度和矫顽力均明显增大,冻结温度也随之升高。     

纳米复合Pr2Fe14B/α-Fe永磁材料晶化行为和磁性能的研究

利用熔体快淬和晶化处理方法制备了Pr2Fe14B/α-Fe纳米复合永磁材料.采用X射线衍射分析(XRD)、差热分析(DTA)、磁性测量(VSM)等方法对合金的晶化行为和磁性能进行研究.结果发现对于Pr2Fe14B/α-Fe熔体快淬永磁粉末,α-Fe相析出温度对材料升温速率敏感,可通过提高升温速率尽量使α-Fe和Pr2Fe14B两相的析出温度接近,但难以找到一个温度使两相同时大量析出.(Pr8.2Fe86.1B5.7)0.99Zr1淬态合金在963K时,会生成亚稳相Pr2Fe23B3,使磁性能恶化,延长晶化热处理时间或增高晶化热处理温度均可使亚稳相分解.合金在合适的条件下热处理后,材料磁性能较淬态样品有明显提高.     

纳米晶的形成对FeCSiBPCu非晶合金软磁性能的影响

研究了Fe76-xC7.0Si3.3B5.0P8.7Cux(x=0、0.3%或0.7%(原子分数))非晶合金中Cu的添加及纳米晶的形成对其软磁性能的影响,对合金的微观结构进行了X射线衍射实验和高分辨透射电镜观察,对合金的热稳定性和晶化激活能进行了测量和分析。结果表明,该合金退火之后的饱和磁化强度与合金中α-Fe纳米晶粒的密度和大小密切相关。Cu的添加可以影响合金的非晶形成能力、热稳定性和晶化激活能,添加少量的Cu(少于0.3%(原子分数))可以有效地提高合金的非晶形成能力,抑制退火过程中α-Fe纳米晶粒的析出,增强合金的热稳定性,而当Cu的添加量达到0.7%(原子分数)时可以降低合金的晶化激活能,促进α-Fe纳米晶粒的形核,提高α-Fe纳米晶粒的密度,使合金的饱和磁化强度达到1.79T。     

纳米晶复合永磁材料研究进展

综述了近年来纳米晶双相复合永磁材料的发展状况,重点从该类合金的矫顽力理论和提高磁性能的方法两个方面作简要的评述.     

纳米晶复合永磁材料研究进展

就近年来纳米晶双相复合永磁材料的发展状况,从该类合金的矫顽力理论和提高磁性能的方法2个方面为重点做简要的评述.     

纳米晶复合Nd9.5Fe81-xCoxZr3B6.5永磁材料磁性能的研究

采用熔体快淬及晶化退火工艺制备了Nd9.5Fe81-xCoxZr3B6.5(x=0、2、5、8、10)纳米晶合金条带,研究了Co的添加对快淬合金磁性能和居里温度的影响.结果表明,适量Co元素的添加能够有效降低各相晶粒的尺寸,增强了软、硬磁相晶粒的交换耦合作用,从而提高了合金的磁性能.Co含量为5%(原子分数)的合金,经670℃/4min的晶化处理后所得到的最佳磁性能为`Br=0.90T,jHc=588kA/m,(BH)max=117kJ/m3.     

纯石墨粉对NdFeB烧结磁体的显微组织和磁性能的影响

主要研究了在烧结ＮｄＦｅＢ磁体的晶界添加Ｃ对显微组织和磁性能的影响。实验表明，随Ｃ添加量的增大，晶粒先粗化再细化，矫顽力呈先下降后上升再下降的趋势当Ｃ一达到０．４％ｗｔ时，晶界变得零乱而不规整。Ｘ射线衍射分析表明此时磁体内生成了Ｎｄ２Ｆｅ１７Ｃ相，矫顽力和晶粒尺寸的变化均与Ｎｄ２Ｆｅ１７Ｃ的生成有关。     

Fe-Ni基纳米晶软磁粉芯磁性能研究

采用模压成型成功制备了Fe-Ni基纳米晶磁粉芯。并研究了热处理温度和时间、纳米晶粉体的粒度、成型压力等对其磁性能的影响和其温度稳定性和频率稳定性。结果表明,当100～900℃内退火,随着温度升高,μe和Q值都呈先增后减,600℃时μe达到最大值31.5,其最佳退火时间为2h。成型压力和纳米晶粉体粒度越大,μe越大,Q值越小。在100～1000kHz内,磁粉芯具有较好的频率稳定性。在25～100℃内,随着温度的升高,μe逐渐下降,其中25～40℃内,μe变化敏感,温度系数αμ为-1.95×10-3℃-1,而高于40℃时,其温度系数αμ仅为-2.48×10-4℃-1。     

一次回火温度对烧结NdFeB永磁材料组织和性能的影响

探讨了880~900℃、910~930℃、940~960℃温度区间下1h回火处理对Nd30Dy3.5Al0.2B1合金显微组织和磁性能的影响。研究表明,温度低于910℃时,晶界富Nd带过厚且积聚,主相体积分数小,矫顽力、磁能积低;温度高于930℃时,晶粒尺寸过大,晶界面积变小,晶界富Nd带加厚,矫顽力、磁能积均下降;910~930℃时晶粒尺寸趋向均匀,晶界富Nd带呈薄层状分布,磁性能最佳。     

Phase Transformation and Magnetic Properties of Mechanically Alloyed PrCo5-based Magnets

PrCo5-based nanograin Pr=CO100-x （x=14-22） alloys with high coercivity were synthesized by mechanical alloying and subsequent annealing. The crystallization, phase components and magnetic properties of the alloys were investigated systematically. The main phase of the alloy for x=14 is Pr2CO17 with rhombohedral Th2Zn17-type. The amount of the Pr2CO17 phase decreases with increasing Pr content, and a nearly single phase PrCo5 with hexagonal CaCu5-type is formed in Pr18Co81 alloy. Further increase in the Pr content leads to the formation of another magnetically hard Pr2Co7 phase with its Curie temperature about 350℃. Remanences decrease monotonously with increasing Pr content, whereas the coercivities increase, reaching a maximum of 2040 kA/m （25.6 kOe） in Pr19CO81 powders milled for 5 h and annealed at 973 K for 2 min, and then decrease for higher Pr content. The high coercivity is attributed to the high anisotropy field of the PrCo~ phase and its nanoscale grain size.     

Microforging Effect on the Microstructure and Magnetic Properties of FeSiB-based Nanoflakes

The effect of microforging on the processing of nanocrystalline FeSiB alloy flakes was studied in terms of microstructure and magnetic properties. The flakes microforged from amorphous precursor showed submicron thicknesses with the crystal size of about 15 nm. The crystallite size during microforging was primarily deter- mined by plastic deformation rather than fracturing and agglomeration. Unlike the general trend of coercivity reduction with annealing, the coercivity of the nanocrystalline flakes was slightly increased with increasing an- nealing temperature, which can be explained with the diffusion anisotropy of the magnetic moments resulting from the formation of Fe-atoms pairs. The magnetic remanence (Mr) of the planar nanocrystalline flakes was measured to be about 26% of the saturation magnetization (Ms), a significant increase from 2% of the initial amorphous precursor.     

热处理对TC6钛合金组织和力学性能的影响

本文对比研究了四种典型的热处理工艺对TC6钛合金组织和性能的影响,并且详细研究了等温退火对TC6钛合金组织和性能的影响。结果表明：冷却速度的提高,合金组织形貌没明显的改变,但亚稳相的比例升高,有析出强化;等温退火中加热温度的提高,a晶粒有明显的粗化现象。普通退火、等温退火、双重退火、固溶时效四种热处理方式的常温和高温强度依次增高而塑性降低;对于等温退火,经920℃／1．5h,FC＋620℃／2h,AC热处理,TC6钛合金可以获得较好的综合力学性能。     

Mechanical Properties and Microstructure of Si3N4-TiC Nanocomposites

1. IntroductionSilicon nitride is one of the promising structural ma-terials for high-temperature applications because of itshigh resistance to thermal shock, as well as high strength,high fracture toughness, and high resistance to chemicalattack[1~3]. However, wider application has been lim-ited mainly due to its inherent brittleness. Many effortshave been made to improve its properties by control-ling the microstructure or by fabricating various typesof composites[4~7].The silicon nitride wi…     

Microstructure and Magnetic Properties of Electrodeposited Fe-Based Thin Films on Silicon Substrate Under Heat Treatment

Three kinds of Fe-based thin films, Fe–20%Ni–80%, Fe–60%Co–40%, and Fe–10%Ni–60%Co–30% (at %), were prepared on silicon (1 1 1) substrates by direct current electrodeposition with the optimized plating conditions. Films were annealed at various temperatures from 200 to 400 °C, varying time from 2 to 4 h. The microstructure, surface morphology, and chemical composition have been investigated by X-ray diffraction, scanning electron microscopy, energy dispersive spectrometer with electron probe micro-analysis, respectively. The magnetic properties were measured by the superconducting quantum interference device magnetometer. Effect of heat treatment on films is then discussed.     

Synthesis and Enhanced Superplasticity of the Zirconia-dispersed Alumina Nanocomposite

A series of alumina-zirconia composites with various grain sizes were prepared from the nano-sized powders with different agglomerations. Microstructural analysis of the sintered compacts indicates that the as-sintered material is a typical intra/inter granular nanocomposite with uniform distribution of the zirconia grains in the alumina matrix. Superplastic deep drawing test under different conditions demonstrates that dense Al2O3/ZrO2 samples with average grain size of 230 nm can be elongated to a dome height of at least 12 mm at the punch rate of 0.6 mm·min-1 at 1400℃. Further drawing tests show that for the composites with larger grain size, such elongation cannot be achieved at such a strain rate.