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R3(Fe,M)29化合物中的Fe—Fe及R—Fe之间的交换作用 总被引:1,自引:1,他引:0
根据R3(Fe,M)29(R=稀土,M=V、Ti、Mo)化合物的居里温度的实验值,使用平均场近似的方法计算R3(Fe,M)29化合物中的R-Fe,Fe-Fe之间的交换耦合参数JRFe和JFeFe。结果表明:对于R相同而M不同时,当M=V时JFeFe最大,而M=Mo时JFeFe最小;但是,当M=Ti时JRFe最大,当M=Mo时JRFe最小。 相似文献
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Nanocrystalline Nd2Fe14B/α—Fe permanent magnet 总被引:2,自引:0,他引:2
Nd8.5Fe75Co5Cu1Zr3Nb1B6.5bonded magnet was prepared by melt-spinning(vs=18m/s)and subsequent heat treatment(670℃,4min).Excellent magnetic properties of the bonded magnet were achieved:Br=0.68T,iHc=620.3kA/m,(BH)max=74kJ/m^3.The addition of Cu and Zr elements shows to be advantageous in improving an intrinsic coercivity and squareness of hysteresis loop,as well as energy product.In has a remarkable remanence enhancement and the isotropic saturation remanence ratio Mr/Ms is 0.83. 相似文献
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Pure Fe and Fe–15Cr single crystals with three different orientations, [1 0 0], [1 1 0] and [1 1 1], were irradiated in the BR2 reactor of SCK-CEN, at a temperature of 300 °C to a dose of 0.2 displacements per atom. Irradiation-induced microstructure changes were studied by transmission electron microscopy. The size distribution and defect densities were measured and the Burgers vectors and the nature of the loops were determined in detail. In the pure Fe specimens, mainly a〈1 0 0〉 edge-type interstitial dislocations loops could be identified. Their average density and size were (4.1 ± 0.4) × 1021 m?3 and (8 ± 2) nm, respectively. In Fe–15Cr, on the other hand, no defects could be observed. 相似文献
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研究了中试规模并添加Pr的Fe3B/R2Fe14B双相纳米晶永磁,介绍了磁体的制备和试验方法,并对于测试结果进行了分析探讨。 相似文献
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介绍了原位反应制备TiCp/Fe、VCp/Fe复合材料的方法,采用失重分析、腐蚀形貌观察等试验方法研究了原位自生TiCr/Fe、VCp/CFe复合材料在氯化钠溶液中的耐腐蚀性能。结果表明:(1)TiCp/Fe、VCr/Fe复合材料都比45钢、HT250具有更好的耐腐蚀性能,其中VCp/Fe复合材料更为优越;(2)TiCp/Fe、VCdFe复合材料倾向于局部腐蚀破坏,其中增强相与基体的界面优先被腐蚀。 相似文献
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采用原位合成工艺制取TiCp/Fe、VCp/Fe复合材料并浇注Y形试块,然后将试块重新熔化并重新浇注试块,借助金相显微镜和扫描电镜研究重新熔化前后的组织变化.结果表明:原位TiCp/Fe复合材料重熔后,TiC颗粒的尺寸、形状及其在基体中的分布没有明显变化,颗粒的数量有所减少,基体的硬度有所降低;原位VCp/Fe复合材料重熔后,VC颗粒的尺寸稍微减小,颗粒在基体中分布更加均匀,有利于提高复合材料的韧性. 相似文献
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通常显示单磁畴行为的铁磁性微粒分散于非磁性体内并使之形成形状各向异性时就可获得高的矫顽力。因此 ,利用非磁性铜与铁磁性铁几乎不固溶的性质 ,研制了具有一定矫顽力的半硬磁材料。因为这种材料难以用熔炼法生产 ,所以运用了多层叠轧制技术 ,将纯铁板与无氧铜板交替重叠成板坯后 ,通过轧制制成了叠层数为 12 2 3层的Fe/Cu超级叠层材料。Cu层厚度为 18nm ,Fe层厚度为 80nm ,该材料经过热处理后产品的磁特性为 :矫顽力Hc =1831A/m(2 3Oe) ,剩磁Br =1 5T(15kG) ,最大磁通密度B10 0 =1 7T(kG) ,方形比Br/B10 0 =0 87。Fe/Cu半硬磁材… 相似文献
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S. Chevalier P. Juzon G. Borchardt A. Galerie K. Przybylski J. P. Larpin 《Oxidation of Metals》2010,73(1-2):43-64
The oxidation behavior of Fe3Al and Fe3Al–Zr intermetallic compounds was tested in synthetic air in the temperature range 900–1200 °C. The addition of Zr showed a significant effect on the high-temperature oxidation behavior. The total weight gain after 100 h oxidation of Fe3Al at 1200 °C was around three times more than that for Fe3Al–Zr materials. Zr-containing intermetallics exhibited abnormal kinetics between 900 and 1100 °C, due to the presence and transformation of transient alumina into stable α-Al2O3. Zr-doped Fe3Al oxidation behavior under cyclic tests at 1100 °C was improved by delaying the breakaway oxidation to 80 cycles, in comparison to 5 cycles on the undoped Fe3Al alloys. The oxidation improvements could be related to the segregation of Zr at alumina grain boundaries and to the presence of Zr oxide second-phase particles at the metal–oxide interface and in the external part of the alumina scale. The change of oxidation mechanisms, observed using oxygen–isotope experiments followed by secondary-ion mass spectrometry, was ascribed to Zr segregation at alumina grain boundaries. 相似文献
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Fe—Cu和Fe—Ag颗粒膜的巨磁电阻 总被引:1,自引:0,他引:1
报道了FexCu1-x和FexAg1-x颗粒膜的磁电阻随成分和温度的变化,在1.5K和7T磁场下测量的磁电阻值可达50%,并发现磁化强度的饱和场小于2T,而磁电阻在7T时仍未饱和,样品从低温到室温具有较大的温度系数,对上述情况进行了初步探讨。 相似文献
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《中国有色金属学会会刊》2021,31(10):3039-3049
Cu–Fe alloys with different Fe contents were prepared by vacuum hot pressing. After hot rolling and aging treatment, the effects of Fe content on microstructure, mechanical properties and electrical conductivity of Cu–Fe alloys were studied. The results show that, when w(Fe)<60%, the dynamic recrystallization extent of both Cu phase and Fe phase increases. When w(Fe)≥60%, Cu phase is uniformly distributed into the Fe phase and the deformation of alloy is more uniform. With the increase of the Fe content, the tensile strength of Cu–5wt.%Fe alloy increases from 305 MPa to 736 MPa of Cu–70wt.%Fe alloy, the elongation decreases from 23% to 17% and the electrical conductivity decreases from 31%IACS to 19%IACS. These results provide a guidance for the composition and processing design of Cu–Fe alloys. 相似文献
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