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Superconducting (Li,fe)OHfeSe Film of High Quality and High Critical Parameters

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Chinese Physics Letters 2017年第7期34卷 242-245页

作者：黄裕龙冯中沛倪顺利李军胡卫刘少博毛义元周花雪周放金魁王华兵袁洁董晓莉赵忠贤 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Research Institute of Superconductor Electronics Nanjing University Key Laboratory for Vacuum Physics University of Chinese Academy of Sciences

A superconducting film of （Li1-xfex）OHfeSe is reported for the first time. The thin film exhibits a small in-plane crystal mosaic of 0.22°, in terms of the full width at half maximum of the x-ray rocking curve, and an excellent out-of-plane orientation by x-ray φ-scan. Its bulk superconducting transition temperature Tc of 42.4 K is characterized by both zero electrical resistance and diamagnetization measurements. The upper critical field Hc2 is estimated to be 79.5 T and 443 T for the magnetic field perpendicular and parallel to the ab plane, respectively. Moreover, a large critical current density Jc of a value over 0.5 MA/cm2 is achieved at-20 K. Such a （Li1-xfex）OHfeSe film is therefore not only important to the fundamental research for understanding the high-Tc mechanism, but also promising in the field of high-To superconductivity application, especially in high-performance electronic devices and large scientific facilities such as superconducting accelerator.

关键词： Superconducting fe

Giant Magnetostrictions of Tb-Dy-fe Polycrystals with < 110 > Axial Alignment

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Journal of Materials Science & Technology 2000年第2期16卷 175-176页

作者： Shouzeng ZHOU, Xuexu GAO, Maocai ZHANG, Qing ZHAO and Zhenhlla SHI (State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China) State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China

Preparing method and processing of Tb-Dy-fe alloy samples with [110] axial orientation as well as their magnetostrictive properties have been studied. It has been found that the magnetostrictive strains of polycrystal samples with [110] axial orientation can reach (1550-1900) ×10~-6 in a low magnetic field less than 80 kA/m, which are equal to or somewhat better than that of the polycrystal samples with [112] axial orientation.

关键词： 110 Giant Magnetostrictions of Tb-Dy-fe Polycrystals with Axial Alignment fe Dy

Growth and Microstructure of r.f. Sputtered fe/Ti Multilayers

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Journal of Materials Science & Technology 2001年第5期17卷 521-524页

作者： Wei WANG Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China Lishi WEN Department of Surface Engineering of Materials, Institute of Metal Research, Chinese Academy of Science Shenyang Natl. Lab. for Mat. Sci. Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

fe/Ti multilayers with different modulation wavelengths (Lambda) prepared by r.f. sputtering has been investigated by using cross sectional transmission electron microscopy (XTEM). It was observed that the columnar structure, interface morphology, and metastable phase presented at the interface of the multilayer system strongly depend on the bilayer thickness (Lambda). For high period multilayers, the waviness wavelength of interfaces is about two times broader than the column diameter. For a sample with Lambda =30 nm, its column width and waviness wavelength was about 80, and 190 nm, respectively. Both of them decreased with the reduction of Lambda, so as to nearly equal values of column diameter and waviness wavelength were obtained. The fe and Ti grains of both 30 nm and 6 nm multilayers are polycrystalline, and have a textured structure. In short bilayer thickness (Lambda =6 nm), the intermetallic compound fe2Ti was presented at the interfaces due to solid state reaction; for Lambda =2 nm, amorphous phase Ti-rich layer was formed at the interfaces, resulting in a sharp interface multilayer structure.

关键词： Ti Growth and Microstructure of r.f Sputtered fe/Ti Multilayers fe

Shape Memory Effect of As-aged fe-14Mn-5Si-8Cr-4Ni-0.2C Alloy

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Journal of Materials Science & Technology 2000年第4期16卷 424-426页

作者： Yuhua WEN, Ning LI and Mingjing TU (Department of Materials Shaping and Controlling Engineering, Sichuan University, Chengdu 610065, China) Department of Materials Shaping and Controlling Engineering Sichuan University Chengdu 610065 China

The effects of aging temperature on shape memory effect, mechanical properties and microstruc-ture of fe-14Mn-5Si-8Cr-4Ni-0.2C shape memory alloy have been studied. The results showed that the second phase particles rich in chromium, manganese and silicon precipitate during aging, and thereby increase the hardness and strength of the alloy. The shape recovery ratio can be remarkably improved by aging and a maximum value can be obtained at 1223 K, which is 68% higher than that of the specimen in solid solution state. When the aging temperature is below 1223 K, the amount of second phase particles increases as the aging temperature increases. The size of austenite grain increases with increasing aging temperature. When the temperature is over 1223 K, the second phase particles can not precipitate. The lack of second phase particles and the increase of grain size make the hardness and shape recovery ratio drastically decrease, when the temperature is over 1223 K.

关键词： Mn Shape Memory Effect of As-aged fe-14Mn-5Si-8Cr-4Ni-0.2C Alloy As fe Cr Ni Si

Microstructure of the Ductile Phase in Intermetallic Compound Ni_(50)Al_(20)fe_(30)

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Journal of Materials Science & Technology 1994年第5期10卷 341-346页

作者： Lianlong HE Shuhe WANG Jianting GUO and Hengqiang YE (Lab. of Atomic Imaging of Solids, Institute of Metal Research, Academia Sinica, Shenyang, 110015, China)(To whom correspondence should be addressed) Lab of Atomic Imaging of Solids Shenyang China

The microstructure of the single hot extruded and annealed Ni50Al20fe30Y0.003 intermetallic compound alloys has been examined by means of high resolution electron microscopy (HREM). In these extruded and annealed alloys. the ductile phase is of a mixture of the disordered fcc γ matrix and or dered γ' precipitates. This fact well interprets the reason why the degree of annealing treatment can influence the strength and ductility of these alloys. The HREM observation revealed directly that there was some strain concentration at γ'-γ interfaces, due to the presence of more iron atoms in these two phases. The fixed orientation relationship between the γ phase and γ' precipitates was identified to be {001}γ||{00 }γ' and γ|| γ'

关键词： fe Figure Microstructure of the Ductile Phase in Intermetallic Compound Ni Al

EFfeCT OF COMPOSITION ON PHYSICAL PROPERTIES OF AMORPHOUS fe-Si-B ALLOYS

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中国有色金属学会会刊：英文版 1997年第2期7卷 156-160页

作者： Wang, Lingling Zhao, Lihua Hu, Wangyu Wu, Lijun Zhang, Bangwei Hunan Univ Changsha China

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关键词： fe Si B fe W Si B amorphous alloys microhardness magnetic losses

Factors Affecting Transformation Temperatures in fe-Mn-Si-Cr-Ni Shape Memory Alloy

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Journal of Materials Science & Technology 2000年第5期16卷 537-539页

作者： Yuhua WEN+, ding LI and Mingjing TU (Department of Materials Shaping and Controlling Engineering, Sichuan University, Chengdu 610065, China) Department of Materials Shaping and Controlling Engineering Sichuan University Chengdu 610065 China

The effects of prestrain and annealing temperature on phase transformation temperatures in fel4Mn5Si8Cr4Ni shape memory alloy have been studied. The results showed that when the annealing temperature was 673 K, both the At and the Ms temperatures increased appreciably as the prestrain increased, the As temperature increased slightly with increasing prestrain; the resistivity difference at 303 K between the heating and cooling curve also increased with increasing prestrain, which agreed with the recovery strain. The shape memory effect in fe-Mn-Si-Cr-Ni shape memory alloy is caused by the stress-induced γ→ε martensite transformation and its reverse transformation. When the prestrain was 10%, the Ms temperature decreased remarkably as the annealing temperature increased.

关键词： Factors Affecting Transformation Temperatures in fe-Mn-Si-Cr-Ni Shape Memory Alloy fe Mn Cr Ni Si

First-principles lattice stability of fe, Ru and Os

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Journal of Central South University 2009年第2期16卷 177-183页

作者：陶辉锦尹健 School of Materials Science and Engineering Central South University School of Metallurgical Science and Engineering Central South University Key Laboratory of Nonferrous Materials Science and Engineering Ministry of Education Central South University

Lattice constants, total energies and densities of states of transition metals fe, Ru and Os with BCC, FCC and HCP structures were calculated by the GGA+PBE functional and the ultrasoft pseudo-potential plane wave method, and compared with those of the first-principles projector augmented wave (PAW) method, CALPHAD method and experimental data. The results show that the lattice stability of this work is △GBCC-HCP>△GFCC-HCP>0, agreeing well with those of PAW method in the first-principles and CALPHAD method except for BCC-fe. And the densities of state of HCP-Ru and Os have an obvious character of stable phase, agreeing completely with the results of the total energy calculations. Further analyses of atomic population show that the transition rate of electrons from s to p state for HCP, FCC and BCC crystals increases from fe to Os, and a stronger cohesion, a higher cohesive energy or a more stable lattice between atoms of heavier metals are formed.

关键词： fe Ru Os lattice stability first-principles

Surface characteristics and corrosion resistance of biodegradable magnesium alloy ZK60 modified by fe ion implantation and deposition

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Progress in Natural Science:Materials International 2014年第5期24卷 547-553页

作者： Yang Zheng Yan Li Jihua Chen Zhengyang Zou School of Materials Science and Engineering Beihang University Key Laboratory of Aerospace Advanced Materials and Performance Beihang University Ministry of Education Beijing Key Laboratory for Advanced Functional Materials and Thin Film Technology Beihang University School of Materials Science and Engineering Hunan University

The ZK60 magnesium alloy has been modified by fe ion implantation and deposition with a metal vapor vacuum arc plasma source. The surface morphology, phase constituent and elemental distribution are determined by scanning electron microscopy, transmission electron microscopy, X-ray diffractometer and Auger electron spectroscopy. The results show that fe thin film is deposited on ZK60 alloy and the corresponding thickness increases from 2.73 μm to 6.36 μm with increasing deposition time. A transition layer mainly composed of Mg, fe and O elements is formed between fe thin film and ZK60 substrate. The potentiodynamic polarization tests reveal that a high corrosion potential and a low corrosion current density are detected for the fe deposited ZK60 alloy, indicating the improvement of corrosion resistance. The tensile deformation test indicates that the fe deposited film on the ZK60 substrate can sustain 1% tensile strain without any cracks.

关键词： Biodegradable magnesium alloy fe MEVVA Ion implantation and deposition Corrosion