检索结果-南通市图书馆

Syntheses, Crystallographic and Magnetic Properties of Nd_3fe_(29-x)Cr_x and Other Associated Compounds

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2000年第3期16卷 261-268页

作者： Xiufeng HAN and Terunobu Miyazaki (Department of Applied Physics, Faculty of Engineering, Tohoku University, Sendai 980-77, Japan) Qiyuan WANG, Jun WANG, Yude ZAN and Lanying LIN (Material Science Center, Institute of Semiconductors, Chinese Academy of Sc Department of Applied Physics Faculty of Engineering Tohoku University Sendai 980-77 Japan Material Science Center Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China

A systematic study of syntheses and magnetic properties of the Nd_3fe_(29-x)Cr_x (x=4.5, 4.7, 5.0, and 5.5) compounds has been performed. The single-phase compounds of Nd_3fe_(29-x)Cr_x can be formed in the range 4.5≤ x ≤ 5.5. The Curie temperature T_C, the saturation magnetization M_s at 4.2 K, the anisotropy field H_A at 4.2 K and room temperature. and the intra-sublattice exchange coupling parameter j_(fefe) at 4.2 K for the Nd_3fe_(29-x)Cr_x compounds decrease with increasing Cr composition from x=4.5 to 5.5, respectively. Nitrogenation and carbonation, unlike hydrogenation. result mainly in improvements of the Curie temperature, the saturation magnetization and the anisotropy field at 4.2 K and room temperature for the Nd_3fe_(29-x)Cr_x compounds compared with their parent compounds.

关键词： fe Crystallographic and Magnetic Properties of Nd3fe x)Cr_x and Other Associated Compounds Syntheses Nd

Hot roll bonding between commercially pure titanium and high-strength low-alloy steel using fe interlayer

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2019年第10期26卷 1126-1136页

作者： Xi-yang Chai Gang Chen feng Chai Tao Pan Zhi-gang Yang Cai-fu Yang Department of Structural Steel Central Iron and Steel Research InstituteBeijing 100081China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

Hot roll bonding was carried out between commercially pure titanium TA2 and high-strength low-alloy steel Q390 using no interlayer and fe interlayer at temperatures of 850,900,950 and 1000℃with a total reduction ratio of 86.7%.Interfacial microstructure and bonding property of clad plates were investigated by electron microscopy and shear *** results showed that with the increase in heating temperature,the shear strength of titanium clad steel plates decreases *** with that of titanium clad steel plates with no interlayer,inserting fe interlayer between titanium and steel can improve the shear strength at 850 and 900℃but deteriorate the shear strength at 950 and 1000℃.The reason for this consequence was that fe interlayer prevented the reaction diffusion of C in titanium to form a thinner TiC layer at 850 and 900℃,while fe interlayer promoted the reaction diffusion of fe in titanium to generate thicker fe2Ti and feTi intermetallic compound layers at 950 and 1000℃.

关键词： Titanium clad steel plate fe interlayer TiC Intermetallic compound Hot roll bonding

Oxidation Behavior of fe-Ni-Co Based Superalloys and Influence of Yttrium Addition

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2000年第5期16卷 509-513页

作者： Jiansheng WU+, Laming ZHANG, Junbiao ZHOU and Yin XU (Open Laboratory for High Temperature Materials and Testing, School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200030, China) Shaowei ZHANG (Beijing Institute of Aerona Open Laboratory for High Temperature Materials and Testing School of Materials Science and Engineering Shanghai Jiaotong University Shanghai 200030 China Beijing Institute of Aeronautical Materials Beijing 100095 China

The oxidation behavior of three fe-Co-Ni based superalloys with different yttrium additions were investigated at 650℃ in air. The oxidation kinetics of the three alloys follows parabolic law initially, then follows linear law. The oxide scale formed on all three alloys consists mainly of Co dissolved fe3O4 and partly of feO and fe2O3, in which fe3O4 acts as a protective layer. An yttrium addition into the fe-Co-Ni based superalloys improves their oxidation resistance by reducing the micro-defects in the scales. Thus, the weight gains of the alloys during the oxidation are reduced, and the transition of parabolic law to linear law is postponed. Pegging was observed on the cross section of alloy with 0.08 wt pct yttrium addition after the oxidation.

关键词： Co In fe Ni

Effect of Mineral Oil on the Mechanical Properties and Fractographs of fe_3(Al,Cr,Zr) Intermetallic Alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1998年第6期14卷 564-566页

作者： Jiansen NI Xiaojing WAN Wenjue CHEN and Song WANG(Institute of Metallurgy and Materials Science, Shanghai University Shanghai 200072) Institute of Metallurgy and Materials Science Shanghai University Shanghai 200072 China

The effect of mineral oil on the mechanical properties and fractographs of fe3(Al,Cr,Zr) in termetallic alloy has been investigated. The results show that the tensile ductility of the fe3(Al,Cr,Zr) alloy tested in oil is comparable with the results obtained in oxygen and is in sensitive to strain rate. The fracture mode of the fe3(Al,Cr,Zr) alloy treated at 700℃/1.5 h and tested in oil, is cleavage and with dimples in some areas.

关键词： Al,Cr,Zr Effect of Mineral Oil on the Mechanical Properties and Fractographs of fe3 Intermetallic Alloy Zr fe Cr

Structural, ferromagnetic, and optical properties of fe and Al co-doped ZnO diluted magnetic semiconductor nanoparticles synthesized under high magnetic field

在线全文

学校读者我要写书评

暂无评论

Advances in Manufacturing 2019年第2期7卷 248-255页

作者： Muhammad Tariq Ying Li Wen-Xian Li Zhong-Rui Yu Jia-Mei Li Ye-Min Hu Ming-Yuan Zhu Hong-Ming Jin Yang Liu Yi-Bing Li Katerina Skotnicova School of Materials Science and Engineering/Institute for Sustainable Energy/Institute of Mateirals Shanghai University Shanghai 20072 People's Republic of China School of Chemistry The University of New South Wales Sydney NSW 2052 Australia Faculty of Metallurgy and Materials Engineering VSB-Technical University of Ostrava Ostrava Czech Republic

In this study, 2% fe and 3% Al co-doped ZnO nanoparticles were synthesized using a hydrothermal method under high magnetic field (HMF). The influences of HMF on the structural, optical, and ferromagnetic properties of fe and Al co-doped ZnO nanoparticles were characterized and analyzed. The single-phase wurtzite structure of the synthesized samples was confirmed using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and Raman spectroscopy analysis. The application of HMF decreases the particle size of the spherical nanocrystal as observed by scanning electron microscopy (SEM). Optical analysis indicated that the absoqjtion edge shifted towards a higher wavelength (red shift). The nanoparticles synthesized under the HMF exhibited high room temperature ferromagnetism (RTFM) performance because of the high oxygen vacancy (VO) content as revealed by X-ray photoelectron spectroscopy (XPS), which was in agreement with the prediction of the bound magnetic polarons theory.

关键词： fe and Al co-doped ZnO nanoparticles Room temperature ferromagnetism (RTFM) High magnetic field Hydrothermal Optical property

Martensitic Transformation in fe-Mn-Si Based Shape Memory Alloys

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1999年第2期15卷 111-116页

作者： T. Y. Hsu (XU Zuyao)(Shanghai Jiao Tong University, Shanghai 200030, China) Shanghai Jiao Tong University Shanghai 200030 China Chinese Academy of Sciences China

The critical driving force for martensitic transformation fcc ( gamma ) yields hcp ( epsilon ) in ternary fe-Mn-Si alloys increases with the content of Mn and decreases with that of Si. Thermodynamical prediction of M//s in ternary fe-Mn-Si alloys was established. The fcc ( gamma ) yields hcp ( epsilon ) martensitic transformation in fe-Mn-Si is a semi-thermoelastic and the nucleation process does not strongly depend on soft mode. Nucleation occurs directly through an overlapping of stacking fault rather than pole mechanism, and it is suggested that stacking fault energy (Sfe) is the main factor controlling nucleation. Based on the phenomenological theory of martensite crystallography, a shuffle on (0001)//h//c//p plane is required when d//1//1//1 does not equal d//0//0//0//2. The derived principal strain in Bain distortion is smaller, i, e., more reasonable than the values given by Christian. Alloying elements strengthening the austenite, lowering Sfe of gamma phase and reducing T//N** gamma temperature may be beneficial to shape memory effect of fe-Mn-Si based alloys. Accordingly, fe-Mn-Si-RE and fe-Mn-Si-Cr-N (or fe-Mn-Si-Ni-Cr-N) are worthy to be recommended as shape memory materials with improved shape memory effect. (Edited author abstract) 48 Refs.

关键词： Mn Martensitic Transformation in fe-Mn-Si Based Shape Memory Alloys fe Si

Effect of fe concentration on the nonlinear refraction and reverse saturable absorption in ferroelectric X-cut LiNbO_3 crystal

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2015年第7期13卷 92-95页

作者： H.L.Saadon Laser Applications and Optical Materials Group Department of Physics College of ScienceUniversity of Basrah

In this Letter, the effects of the iron （fe） dopant concentration on the nonlinear optical properties of iron-doped ferroelectric X-cut LiNbO3 crystals plates are studied by using the Z-scan technique with a cw laser at the wave- length of 532 nm. The amount of iron in the compound is varied from 0 to 0.15 mol%. Measurements of nonlinear refractive index n2 and the nonlinear absorption coefficient β are determined. The sign of the nonlinear refractive index is found to be negative and the magnitude is on the order of 10-s cm2/W. This nonlinear effect increases as the concentration increases from 0 to 0.15 mol%. A good linear relationship is obtained between nonlinear refractive index, nonlinear absorption coefficient, and concentration.

关键词： fe Effect of fe concentration on the nonlinear refraction and reverse saturable absorption in ferroelectric X-cut LiNbO3 crystal

Electronic Phase Separation in Iron Selenide(Li,fe)OHfeSe Superconductor System

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2018年第5期35卷 123-128页

作者： Yiyuan Mao Jun Li Yulong Huan Jie Yuan Zi-an Li Ke Chai Mingwei Ma Shunli Ni Jinpeng Tian Shaobo Lin Huaxue Zhou Fang Zhoul, Jianqi Lil, Guangming Zhang Kui Jin Xiaoli Dong Zhongxian Zhao Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 University of Chinese Academy of Sciences Beijing 100049 Key Laboratory for Vacuum Physics University of Chinese Academy of Sciences Beijing 100049 Research Institute of Superconductor Electronic Nanjing University Nanjing 210093 School of Physics Beijing Institute of Technology Beijing 100081 State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua University Beijing 100084

The phenomenon of phase separation into antiferromagnetic（AFM） and superconducting（SC） or normal-state regions has great implication for the origin of high-temperature（high-T_c） superconductivity. However, the occurrence of an intrinsic antiferromagnetism above the T_c of（Li,fe）OHfe Se superconductor is questioned. Here we report a systematic study on a series of（Li,fe）OHfe Se single crystal samples with T_c up to ～41 K. We observe an evident drop in the static magnetization at T_（afm）～ 125 K, in some of the SC（T_c 38 K, cell parameter c■9.27 ？） and non-SC samples. We verify that this AFM signal is intrinsic to（Li,fe）OHfe Se. Thus, our observations indicate mesoscopic-to-macroscopic coexistence of an AFM state with the normal（below T_（afm）） or SC（below T_c） state in（Li,fe）OHfe Se. We explain such coexistence by electronic phase separation, similar to that in high-T_c cuprates and iron arsenides. However, such an AFM signal can be absent in some other samples of（Li,fe）OHfe Se, particularly it is never observed in the SC samples of T_c 38 K, owing to a spatial scale of the phase separation too small for the macroscopic magnetic probe. For this case, we propose a microscopic electronic phase separation. The occurrence of two-dimensional AFM spin fluctuations below nearly the same temperature as T_（afm）, reported previously for a（Li,fe）OHfe Se（T_c ～ 42 K） single crystal, suggests that the microscopic static phase separation reaches vanishing point in high T_c（Li,fe）OHfe Se. A complete phase diagram is thus established. Our study provides key information of the underlying physics for high-T_c superconductivity.

关键词： Li,fe)OHfeSe Superconductor System fe Electronic Phase Separation in Iron Selenide AFM

IN SITU　GRADIENT　DOUBLE-LAYER　COMPOSITES　OF　Al-fe　ALLOY　BY　CENTRIFUGAL　CASTING

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 1997年第1期7卷 126-131页

作者： Wang, Qudong Dalian Univ of technology Dalian China

ＩＮＳＩＴＵＧＲＡＤＩＥＮＴＤＯＵＢＬＥＬＡＹＥＲＣＯＭＰＯＳＩＴＥＳＯＦＡｌＦｅＡＬＬＯＹＢＹＣＥＮＴＲＩＦＵＧＡＬＣＡＳＴＩＮＧ①ＷａｎｇＱｕｄｏｎｇ，ＪｉｎＪｕｎｚｅＲｅｓｅａｒｃｈＣｅｎｔｅｒｏｆＦｏｕｎ... 详细信息

ＩＮＳＩＴＵＧＲＡＤＩＥＮＴＤＯＵＢＬＥＬＡＹＥＲＣＯＭＰＯＳＩＴＥＳＯＦＡｌＦｅＡＬＬＯＹＢＹＣＥＮＴＲＩＦＵＧＡＬＣＡＳＴＩＮＧ①ＷａｎｇＱｕｄｏｎｇ，ＪｉｎＪｕｎｚｅＲｅｓｅａｒｃｈＣｅｎｔｅｒｏｆＦｏｕｎｄｒｙＥｎｇｉｎｅｒｉｎｇ，Ｄａｌ...

关键词： in situ composites gradient composites double layer composites Al fe alloy centrifugal casting