共查询到19条相似文献,搜索用时 171 毫秒
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对熔体急冷法制备的Fe43Co43Hf7B6Cu1非晶合金进行了200,300,400和500 ℃保温30 min的退火处理,用正电子湮没寿命谱、X射线衍射、穆斯堡尔谱等方法研究了退火后试样的结构及结构缺陷变化.结果表明,在非晶合金的制备态,正电子主要在非晶基体相空位尺寸的自由体积中湮没,湮没寿命τ1为158.4 ps,强度I1关键词:
43Co43Hf7B6Cu1非晶')" href="#">Fe43Co43Hf7B6Cu1非晶
退火处理
正电子湮没寿命
结构与结构缺陷 相似文献
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本文叙述了用偏振中子衍射方法对Fe_83B_17非晶合金和中子衍射方法对Ni_64B_36非晶合金的结构研究。由实验数据计算了每种合金的偏干涉函数(PSF) S_(ij)(Q),和偏简约径向分布函数G_(ij)(r)。并得到原子短程结构上的各项参数。在此基础上,讨论了这一类非晶态合金的结构模型,计算了其一种模型简单单元的中子衍射散射强度,并和实验所得的结果作了比较。 相似文献
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在CO2激光功率为50—300W、扫描速度为20mm/s、激光散光斑为20mm照射条件下 ,诱导非 晶Fe735Cu1Nb3Si135B9带中发生结构重组,产生定量纳米α-F e(Si)晶相形成双相组织结构材料. 利用穆斯堡尔谱研究了非晶Fe735C u1Nb3Si135B9合金激光纳米化的 超精细结构. 实验结果表明,激光诱导非晶 Fe735Cu1Nb3Si135B 9纳米化后,其超精细磁场的分布随 着激光功率变 化由单峰向双峰变化,在高功率辐照时, 出现了双峰分布,并且峰位向高场移动. 高激光 功率辐照非晶Fe735Cu1Nb3Si135 sub>B9合金纳米晶化相有四种超精细结 构,即2个超精细磁场较小的初晶相和2个超精细磁场较大的纳米晶化相. 其中超精细磁场较 大(17—25MA/m)的α-Fe(Si)相为DO3结构.
关键词:
激光
纳米晶α-Fe(Si)
735Cu1Nb< sub>3Si135B9')" href="#">非晶Fe735Cu1Nb< sub>3Si135B9
超精细结构
超精细磁场 相似文献
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本文报道利用单辊方法制备的非晶Nd3Fe81B16合金的晶化及其对磁性和M?ssbauer谱的影响。发现在非晶Fe81B19合金中用3at%Nd取代B,使非晶Fe81B19合金的晶化温度提高88℃。在适当的退火条件下晶化后样品在室温下的磁性是:σs=189emu/g,σr/σs=0.7,iHc=2.15kOe,Br≈12kG,bHc=2kOe,(BH)max≈8MGOe。与目前广泛使用的六角铁氧体相比,bHc相近,但Br和(BH)max远比六角铁氧体高。这种材料仅含有少量的Nd,因此可能开发为一种新的廉价永磁材料。本文对少量Nd的添加对非晶FeB合金的晶化温度,磁性和M?ssbauer谱的影响进行了讨论。初步探讨了高矫顽力的来源,认为它的磁化和反磁化过程可以用畴壁钉扎理论解释。
关键词: 相似文献
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本文从计算非晶态材料散射强度的Debye方程,推导出非晶态二元合金模型的Faber-Ziman偏干涉函数计算公式。利用这些公式,计算了Fe83B17和Ni64B36金属玻璃模型的SFeB(Q)和SNiB(Q),并和实验结果及模型计算的偏散射强度IFeB(Q)和INiB(Q)作了比较。文中还计算了Hg2Na液态合金模型的偏干涉函数,并把它们外推到零衍射角时的数值。最后讨论了具有化学短程序合金的全干涉函数在零衍射角附近的行为。
关键词: 相似文献
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M.M. Kanitkar V.N. Shukla P.L. Kanitkar Dilip S. Joag 《Solid State Communications》1984,50(9):817-819
Metallic glass Fe40Ni40B20 is imaged at liquid hydrogen temperature in field ion microscope. Pair and angular distributions are obtained from the analysis of a large number of micrographs. The pair distribution is found to exhibit features typical of metallic glasses. The angular distribution agrees well with the theoretical distribution for Lennard-Jones glass obtained by Jacobaeus et al. The closer agreement achieved has been attributed to the better experimental conditions and the improved resolution of field ion microscope. 相似文献
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E. Sváb N. Kroó S.N. Ishmaev I.P. Sadikov A.A. Chernyshov 《Solid State Communications》1983,46(4):351-353
The S(Q) structure factor of (Ni65Fe35)77B23 metallic glass was measured by time-of-flight neutron diffraction up to 24 Å?1 momentum transfer. The distribution of transition metal-boron and transition metal-transition metal first neighbour atom pairs is resolved in the distribution function obtained from S(Q) by Fourier transformation. The distances of these first neighbours pairs, the width of their distribution, the partial coordination numbers and the short range order parameter are given. The results on (Ni65Fe35)77B23 and on the previously studies Fe81B19 amorphous alloys are compared. 相似文献
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本文研究了金属玻璃(Fe1-xCOx)78Si10B12的磁化感生各向异性、应变感生各向异性随成分和温度的变化。磁化感生各向异性常数Kum为正值,x=0.7时为最大;不可逆的应变感生各向异性常数Kusi为正值,x=0.5时为最大;可逆的应变感生各向异性常数Kusr除了x>0.975区均为负值,在x=0.7时为最大;感生各向异性常数在温度变化时与Msα成正比,α在3.4和7.5之间随成分和退火工艺而变化。用短程有序模型解释了部分实验结果。
关键词: 相似文献
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The electronic structures of LaRh3B2 and CeRh3B2 have been calculated using the self-consistent KKR method and are discussed in terms of recent experimental results. 相似文献
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K. Lal S. K. Chattopadhyay A. K. Meikap S. K. Chatterjee M. Ghosh 《Czechoslovak Journal of Physics》2001,51(9):897-908
A detailed study on the weak localization phenomenon vis-a-vis electron-electron interaction effects in magnetic metallic
glasses has been carried out. We measured the electrical conductivity and magnetoconductivity within the temperature range
1.8≤T≤300K. A maximum on the conductivity versus temperature curve exists atT=T
m. The conductivity was observed to follow aT
1/2 law forT<T
m andT
2 law forT>T
m. Magnetoconductivity data of these alloys indicate the prominence of electron-electron interaction at low temperatures. The
authors have determined the inelastic scattering field and spin-orbit scattering field from the magnetoconductivity data.
The inelastic scattering field obeys aT
p law (p=2) at low temperatures. 相似文献
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Y. Jiraskova K. Zabransky M. Vujtek 《Journal of magnetism and magnetic materials》2010,322(14):1939-1946
The influence of tensile stress on the changes in hyperfine parameters obtained by Mössbauer spectroscopy of the ferromagnetic amorphous NANOPERM-type Fe80Nb3Cu1B16 alloy has been investigated. The bulk changes are obtained by Mössbauer spectroscopy in a transmission geometry using γ-rays; the surface properties are studied in a scattering geometry using conversion electrons. The Mössbauer spectra are analyzed by two distributions of hyperfine inductions, which result in high-field and low-field components corresponding with a model of clusters formed by predominantly iron atoms and intermediate phase containing mainly the Nb, Cu and B atoms. The obtained results are completed by the bulk and surface magnetic measurements, with observations of surface morphology by AFM and microstructure by SEM. The investigations yield approximately linear increase of hyperfine parameters and slight deterioration of the bulk as well as surface magnetic characteristics with tensile loading. 相似文献
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The substitution of iron for cobalt in crystalline Co3B and Co78B22 and Co72Si2B26 glasses has been studied by Mössbauer spectroscopy. In both crystalline and amorphous states, iron preferentially replaces those cobalt atoms which have two boron nearest neighbours. 相似文献
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E. Svab N. Kroo S.N. Ishmaev I.P. Sadikov A.A. Chernyshov 《Solid State Communications》1982,44(8):1151-1155
The structure factor of Fe81B19 metallic glass was measured by the conventional and time-of-flight neutron diffraction methods in the 0.4<Q<24 Å-1 momentum transfer range, yielding high resolution (~0.26 Å) in r-space. The pair distribution function obtained by Fourier transformation is resolved into subpeaks. The distances and distribution widths of the Fe-B and Fe-Fe first neighbours, the partial coordination numbers and the short range order parameter are given. The results clearly indicate preferential chemical bonding between iron and boron atoms. 相似文献
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The specific heat of ferromagnetic metallic glasses Fe80B20?xCx (0≤x≤8) has been measured in the temperature range between 1.5 and 10 K. It is found that the electronic specific heat coefficient is independent of the carbon concentration x. The Debye temperature has a broad peak around x = 4. Both these results are in sharp contrast to the case of FeB binary metallic glasses and could be qualitatively understood in terms of magnetic and structural properties. 相似文献