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Structure, spin reorientation and Mssbauer effect studies of Tb0.3Dy0.7(Fe1-xAlx)1.95 alloys

Science china(Physics,Mechanics & Astronomy) 2006年第2期Mechanics & Astronomy) .卷 149-157页

作者： ZHENG Xiaoping1,2,4. ZHANG Peifeng1,3, FAN Duowang1, LI Fashen3 & HAO Yuan4.. key lab.ratory of Opto-Electronic technology and Intelligent Control, Ministry of Education, lanzhou Jiaotong {4., lanzhou 730070, china 2. Institute of Electronic Information Science and technology,lanzhou Teachers College, lanzhou 730070, china 3. key lab.ratory for Magnetism and Magnetic materials, Ministry of Education, lanzhou {4., Lan-zhou 730000, china 4. state key lab. of advanced non-ferrous materials, gansu province, lanzhou university of technology, lanzhou 730050, china

The effect of Al substitution for Fe on crystal structure, magnetostriction and spontaneous magnetostriction, anisotropy and spin reorientation of a series of polycrys-talline Tb0.3Dy0.7(Fe1?xAlx)1.95 alloys (x = 0, 0.05, 0.1, 0.15, 0.20, 0.25, 0.30, 0.35) at room temperature and 77 K was investigated systematically. It was found that the primary phase of Tb0.3Dy0.7(Fe1?xAlx)1.95 is the MgCu2-type cubic Laves phase structure when x 4.and the lattice constant a of Tb0.3Dy0.7(Fe1?xAlx)1.95 increases approximately and monotonically with the increase of x. The substitution of Al leads to the fact that the magnetostriction λ inceases slightly in a low magnetic field (H ≤ 4. kA/m), but decreases sharply and is easily close to saturation in a high applied field as x increases, showing that a small amount of Al substitution is beneficial to a decrease in the magnetocrystalline anisotropy. It was also found that the spontaneous magnetostriction λ111 decreases greatly with x in-creasing. The analysis of the M?ssbauer spectra indicated that the easy magnetization direction in the {110} plane deviates slightly from the main axis of symmetry with the changes of composition and temperature, namely spin reorientation. A small amount of non-magnetic phase exists for x = 0.15 in Tb0.3Dy0.7(Fe1?xAlx)1.95 alloys and the alloys be-come paramagnetic for x > 0.15 at room temperture, but at 77 K the alloys still remain magnetic phase even for x = 0.2. At room temperature and 77 K, the hyperfine field de-creases and the isomer shifts increase with Al concentration increasing.

关键词： magnetostriction cubic Laves phase spin reorientation M?ssbauer.

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Microstructure and Orientation Evolution of Unidirectional Solidification Pure Copper during ECAP

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稀有金属材料与工程 2011年第S3期40卷 171-175页

作者： Guo Tingbiao, Ding Yutian, Yuan Xunfeng, Hu Yong state key lab. of gansu {4. non-ferrous Metal materials, lanzhou university of technology, lanzhou 730050,china lanzhou Univ Technol State Key Lab Gansu Adv Nonferrous Met Mat Lanzhou 730050 Peoples R China

Experiment were conducted to unidirectional solidification pure copper during ECAP by route C, the samples were investigated by XRD and EBSD. The results shown that the effect of original microstructure on the subgrains orientation decrease with the increasing of strain. At low strain, in the column grain interiors first formed a band structure that the orientation quite different with the matrix. With the strain increasing, the boundaries of the band structure expanding towards to two sides, gradually partition the original column grains into subgrains, the distribution of the subgrains possesses a directional distribution characteristics and the twins occurring in subgrains. Keep on increasing strain, the original grain boundaries began to broken, low angles grain boundaries and high angles grain boundaries both occur simultaneously shows a diffusion distribution characteristics.

关键词： equal channel angular extrusion (ECAE) electron back-scattering diffraction (EBSD) grain boundaries (GBs) texture

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Effect of cooling rate on plastic deformation of Zr-based bulk metallic glasses

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Progress in Natural Science:materials International 2012年第1期22卷 21-25页

作者： Chunyan Li a,Shengzhong Kou a,b,Yanchun Zhao a,Guangqiao Liu b,Yutian Ding a a state key lab.ratory of gansu {4. non-ferrous Metal materials,lanzhou university of technology,lanzhou 730050,china b key lab.ratory of non-ferrous Metal Alloys and Processing of the Ministry of Education,lanzhou university of technology,lanzhou 730050,china [a] state key lab.ratory of gansu {4. non-ferrous Metal materials Lanzhou University of Technology Lanzhou 730050 China [b] key lab.ratory of non-ferrous Metal Alloys and Processing of the Ministry of Education Lanzhou University of Technology Lanzhou 730050 China

The effect of cooling rate on plastic deformation of Zr-based bulk metallic glasses has been *** specimens with the diameters of 3 mm,4.mm and 6 mm cut from the same ladder-shaped Zr 55 Al 10 Ni 5 Cu 30 BMG rod were used in the present *** experimental results indicated that the different plastic strains were induced for the three type compression *** compressive plastic strain increased with the decreasing diameter for the as-cast specimens,which means that the compressive plastic strain increased with the increasing cooling *** reason of the difference is attributed to the free volume existed in the BMGs during the rapid solidification,and the larger free volume was contained in the specimen fabricated with the higher cooling *** has been found that the prominent serrations and multiple shear bands appeared during the compressive deformation tests of the specimen with smaller diameter of 3 mm,indicating that the specimen with smaller diameter exhibits better plasticity due to more free volume content.

关键词： Bulk metallic glasses Cooling rate Serration Plastic deformation Free volume

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Crystallization kinetics of (Ni_(0.75)Fe_(0.25)_(78-x)Nb_xSi_(10)B_(12)(x=0,5)amorphous alloys

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Rare Metals 2006年第4期25卷 342-348页

作者： CHEN Xueding WEI Hengdou WANG Xiaojun state key lab.ratory of advanced New {4.-ferrous materials l.anzhou University of Technology l.anzhou 730050 China

Amorphous ribbons of （Ni0.75Fe0.25）78-xNbxSi10B12 （x = 0, 5） were prepared by a single roller melt-spinning technique in air atmosphere. The crystallization kinetics of the alloys were investigated by means of continuous heating, and the activation energies of the alloys were calculated using Kissinger plot method and Ozawa plot method on the basis of differential thermal analysis data. The crystallization products were analyzed by X-ray diffraction. After the （Ni0.75Fe0.25）78Si10B12 amorphous alloy was annealed at the temperatures 715 and 74. K, a single phase of γ-（Fe, Ni） solid solution with grain sizes of about 10.3 and 18.5 nm, respectively, precipitates in the amorphous matrix. The crystallized phases are γ-（Fe, Ni） solid solution, Fe2Si, Ni2Si, and Fe3B after annealing at 765 K. The （Ni0.75Fe0.25）73NbsSi10 B12 amorphous alloy was annealed at 720, 750, and 800 K; and the crystallization phases, γ（Fe, Ni） solid solution, （Fe, Ni）23B6. Ni31Si12 and Nb2NiB0.16 form simultaneously.

关键词： amorphous materials thermal analysis crystallization kinetics activation energy

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Effect of TRT process on GFA,mechanical properties and microstructure of Zr-based bulk metallic glass

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Progress in Natural Science:materials International 2011年第1期21卷 53-58页

作者： Guang-qiao LIU~1,Sheng-zhong KOU~(1,2),Chun-yan LI~1,Yan-chun ZHAO~1,Hong-li SUO~2 1.state key lab.ratory of gansu {4. non-ferrous Metal materials, lanzhou university of technology,lanzhou 730050,china 2.The key lab.ratory of {4. Functional materials(Ministry of Education), Beijing university of technology,Beijing 100022,china [a] state key lab.ratory of gansu {4. non-ferrous Metal materials Lanzhou University of Technology Lanzhou 730050 China [b] The key lab.ratory of advanced Functional materials (Ministry of Education) Beijing University of Technology Beijing 100022 China

Series of rod samples of Zr55Al10Ni5Cu30 alloy were prepared by magnetic suspend melting and copper mold suction casting *** effect of thermal rate treatment（TRT） process on glass forming ability（GFA）,mechanical properties and microstructure of Zr-based bulk metallic glass were *** shows that GAF,mechanical properties and microstructure of as-cast Zr55Al10Ni5Cu30 BMGs alloy to a large extent is related to TRT *** and thermal stability of as-cast Zr55Al10Ni5Cu30 alloy increase when overheating temperature *** liquid region△Txand parameterγincrease from 73 K to 89 K,from 0.4.3 to 0.4.7,respectively,when casting voltage increases from 7 kV to 10 *** a threshold overheating temperature is found for the fully amorphous structure,below which it may have an intersection with the crystallization *** is found that the compressive strength increases and the compressive plasticity slightly decreases when overheating temperature ***,the compressive strength and the compressive plasticity simultaneously increase to 1.91 MPa and 2%when casting voltage increases to 10 kV.

关键词： bulk metallic glass glass forming ability(GFA) mechanical properties thermal rate treatment(TRT) process microstructure

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Development of Expert Controller for Plasma Spraying Process

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材料热处理学报 2004年第5B期25卷 783-786页

作者： LIChun-xu CHENKe-xuan LIHe-qi LIDe-wu EducationMinistrykeylab.ofadvancedProcessingtechnologyfor{4.-ferrousmaterials LanzhouUniversityofScience＆TechnologyLanzhouChina CollegeofmaterialsScienceandEngineering LanzhouUniv.ofScience＆TechnologyLanzhouChina

Aiming at the plasma spraying process control, the control system model is developed on the basis of analyzing control parameters and coating properties and their correlation, and the corresponding control method and regulations are also given. With the developed expert controller for plasma spraying process, stable spraying can be realized using ordinary spraying powder and the coating of compaction, homogeneity and high bonding strength can be obtained.

关键词：等离子喷涂控制器粉末熔炼镀层厚度

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Hydrothermal synthesis of vanadium oxide nanotubes by a facile route

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Rare Metals 2006年第z1期25卷 88-93页

作者： HUANG Chunming LIU Xueqin KONG Lingbin ZHOU Haijia LIU Yaqiang QIU Jiawen WANG Yinyue Department of Physics Lanzhou University Lanzhou 730000 China Department of Physics Lanzhou University Lanzhou 730000 China lanzhou Institute of Physics Lanzhou 730000 China State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials Lanzhou University of Technology Lanzhou 730050 China Department of Physics Lanzhou University Lanzhou 730000 China Department of Physics Lanzhou University Lanzhou 730000 China Lanzhou Institute of Physics Lanzhou 730000 China Department of Physics Lanzhou University Lanzhou 730000 China

Vanadium oxide nanotubes were synthesized by hydrothermal treatment from V2O5·nH2O sols as precursor and dodecylamine as structure-directing template. The morphology and structure of the nanotubes were characterized by SEM, TEM, XRD, TG-DTA and FTIR. The experimental results reveal that the duration of the hydrothermal treatment is of importance for obtaining VOx-NTs which have a layered structure. TG-DTA study indicates that V5+ cations in nanotubes are partially reduced to V4. cations. The results from FTIR spectra indicate the difference in V-O vibrations between before and after hydrothermal treatment. From the results, it suggests that during hydrothermal treatment, the rearrangement of the vanadium oxide structure leads to the formation of VOx nanotubes from lamellar structure because of the presence of V4. species.

关键词： vanadium oxide nanotubes hydrothermal synthesis V2O5 sols

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Phase-Field Modeling of Free Dendritic Growth in Binary Alloy under Forced Flow

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Journal of Shanghai Jiaotong university(Science) 2011年第3期16卷 356-359页

作者：肖荣振王智平朱昌盛冯力李文生 state key lab.ratory of gansu {4. non-ferrous Metal materials lanzhou university of technology

A phase-field model(PFM)coupling with phase field,flow field and diffuse equation is presented for simulating isothermal dendrite growth of a nickel-copper alloy under a forced *** on the finite difference method with uniform grid,the C programming code is implemented to complete the phase-field *** simulation results indicate that the interfacial morphology,the symmetry of dendrite formation,the tip growth velocity and the concentration distribution are strongly influenced by the fluid flow.

关键词： phase-field model(PFM) binary alloy convection dendritic growth

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A Fuzzy Evaluation Model for Sphericity of Powder Particle

A Fuzzy Evaluation Model for Sphericity of Powder Particle

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The Sixth International Conference on Measurement and Control of Granular materials

作者： XU Jian-lin state key lab.of gansu New {4.-ferrous Metal materials,gansu university of technology,lanzhou 730050, china CHEN Chao College of Mechano-Electronic Engineering,gansu university of technology,lanzhou 730050,china

Basing on digital image processing technique and fuzzy mathematics theories,a measurement system and a fuzzy mathematics model for sphericity of powder particle are firstly set *** can scientifically and reasonably evaluate sphericity of powder *** paper introduces realizing processes in detail,namely system configure,image processing,image analysis and fuzzy mathematics *** method plays an important role in evaluating sphericity of powder particle and improving the quality in powder manufacture.

关键词： Index terns:powder particle sphericity fuzzy mathematics image processing

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A study of magnetostriction, spin reorientation, and Mssbauer spectra of Tb_(0.3)Dy_(0.6)Pr_(0.1)(Fe_(1-x)Al_x)1.95 alloys with substitution of Fe by Al

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Science china(Physics,Mechanics & Astronomy) 2010年第3期53卷 449-453页

作者： ZHENG XiaoPing1,3, ZHANG PeiFeng1,2, LI FaShen2 & HAO Yuan2 1 Institute of Electronic Information Science and technology, lanzhou City university, lanzhou 730070,{4. 2 key lab.ratory for Magnetism and Magnetic materials, Ministry of Education, lanzhou university, lanzhou 730000,{4. 3 state key lab.ratory of advanced non-ferrous materials, gansu province, lanzhou university of technology, lanzhou 730050,{4. 1. Institute of Electronic Information Science and technology Lanzhou City University Lanzhou 730070 China3. State Key Laboratory of Advanced Non-Ferrous Materials Gansu Province Lanzhou University of Technology Lanzhou 730050 China2. Key Laboratory for Magnetism and Magnetic Materials Ministry of Education Lanzhou University Lanzhou 730000 China

The effects of Al substitution for Fe on the structure, magnetics, magnetostriction, anisotropy and spin reorientation of a series of Tb0.3Dy0.6Pr0.1(Fe1-xAlx)1.95 alloys (x=0.05, 0.1, 0.15, 0.2, 0.25, 0.3) at room temperature have been investigated. The alloys of Tb0.3Dy0.6Pr0.1(Fe1-xAlx)1.95 substantially retain MgCu2-type C-15 cubic Laves phase structure when x 0.15. Fortunately, a small amount of Al substitution is beneficial to a decrease in the magnetocrystalline anisotropy. The spin reorientation temperature decreases with increasing x. The analysis of the Mssbauer spectra indicates that the easy magnetization direction in the {110} plane deviates slightly from the main axis of symmetry with the increase of Al concentration x, namely, spin reorientation, resulting in the change of macroscopical magnetic properties and magnetostriction. The hyperfine field decreases, but the isomer shifts increases with Al concentration increasing and the quadruple splitting QS shows a weak concentration dependence.

关键词： cubic laves phase magnetostriction spin reorientation Mssbauer

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