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In Situ Al_2O_3-TiB_2/Al-Cu Composite Fabricated by Reaction Pressing of TiO_2-Al-B-CuO System

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Journal of Materials Science & Technology 1996年第1期12卷 25-28页

作者： Zongyi MA Jihong LI Yuxiong LU Xiaoguang NING and Jing BI(lab. of atomic imaging of solids, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China) lab. of atomic imaging of solids Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

The in situ formed Al2O3 and TiB2 particulates reinforced Al-3.3 wt pct Cu alloy composite hasbeen successfully fabricated by reaction pressing of TiO2, Al, B and CuO powders. The in situformed Al2O3 and TiB2 particulates with a size from 10 nm to 2 μm are unifOrmly distributedin the matrix. The composite has a tensiIe Strength of 482 MPa and an elastic modulus of103.3 GPa.

关键词： CuO TiO Al TiB

A Molecular Dynamics Study on the (1120) Domain Boundary Structures in Epitaxial Wurtzite GaN

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Journal of Materials Science & Technology 1999年第4期15卷 328-330页

作者： Shaoqing WANGt Yuanming WANG and Hengqiang YE(laboratory of atomic imaging of solids, Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110015, China)To whom correspondence should be addressedE-mail: sqwang@*** laboratory of atomic imaging of solids Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

A computer program has been developed for the moIlcular dynamics calculation of ionic orstrong-ionic covalent systems. Ewald summation algorithm and Keating potentiaI model areadopted to calculate the long-range Coulomb interaction and the short-range bonding forces,respectively. A theoretical study on the domain boundary structures in epitaxial wurtzite GaN film is accomplished with the program. The calculation result is used in the structure formationexplanation of an interesting defect observed by HREM experiment.

关键词： Rev Domain Boundary Structures in Epitaxial Wurtzite GaN A Molecular Dynamics Study on the

Microstructure and superelasticity of porous NiTi alloy

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Science China(Technological Sciences) 1999年第1期42卷 94-99页

作者：李丙运戎利建李依依 1. laboratory of atomic imaging of solids Institute of Metal Research Chinese Academy of Sciences 110015 Shenyang China

The microstructure, porosity, phase composition and superelasticity (SE) in porous NiTi alloys produced by elemental powder sintering are examined by SEM, image analysis and XRD. It is found that it is feasible to produce porous NiTi alloy by elemental powder sintering, and the porosity of sintered porous NiTi alloy is in the range of 36.0 %-41.5 %. The pores are interconnected and the microstructure is sponge-like. Meanwhile, porous NiTi alloy has good SE. XRD patterns show that there is no pure Ni in alloy sintered at 1223 K-9 h. Compared with the biomedical criteria for choice of implanting materials, porous NiTi alloy is satisfying to a great degree.

关键词： powder sintering porous alloy NiTi shape memory alloy superelasticity.

TEM and HREM study on the fine structure and the interfacial structure of bainite

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Science China(Technological Sciences) 1996年第6期39卷 647-655页

作者：李凤照敖青顾英妮姜江孙东升戴吉岩彭红樱 Shandong University of Technology Jinan250061 Laboratory of Atomic Imaging of SolidsInstitute of Metal ResearchChinese Academy of SciencesShenyang 110015China laboratory of atomic imaging of solids Institute of Metal Research Chinese Academy of SciencesShenyang 110015China

The fine structure of bainite,the morphology and distribution of carbide in steels and the morphology of bainite in Cu-Zn-Al alloys have been investigated with *** interfacial structure ledges and interfacial crystal lattice images of Cu-Zn-Al alloys have also been investigated with *** addition of alloying microelements can fine the structure of bainitic ferrite *** bainitic ferrite is composed of subunits or *** carbides differ in morphologies and are distributed in between laths,inside the plates and on the boundaries of *** are abundant fine structures in bainitic *** the primary bainite of Cu-Zn-Al alloy there are interfacial structure ledges,the height of which is about 3 -40 nm,equal to 15-200 atomic *** phase transformation mechanism of bainite is discussed.

关键词： bainitic ferrite fine structure subunit interfacial structure ledges.

MECHANICAL PROPERTIES AND INTERFACIAL STRUCTURES OF ALUMINIUM BORATE WHISKER REINFORCED ALUMINIUM COMPOSITES

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Acta Metallurgica Sinica(English Letters) 1993年第12期6卷 465-471页

作者： PAN Jin NING Xiaoguang HU Kuiyi YE Hengqiang Changsha Institute of Technology ChangshaChina laboratory of atomic imaging of solids Institute of Metal ResearchAcademia SinicaShenyangChina

Quality 9Al_2O_3-2B_2O_3 whisker reinforced 6061Al or Al composites have been prepared by technique of squeeze *** mechanical properties of the 9Al_2O_3·2B_2O_3(w)/6061Al composites could be hardly improved by T6 treatment,owing to cause the remarkable interracial *** observation under high resolution trans- mission electron microscope on interfaces shows that the serious chemical reaction occurs and the product is Al_2MgO_*** no such reaction is found at the interfaces of 9Al_2O_3. 2B_2O_3(w)/Al *** analysis on the interfaces shows that above mentioned interracial reaction may be resulted from the interracial segregation of Mg atoms in 6061Al matrix during sequeeze casting.

关键词： aluminium borate whisker Al matrix composite strength interracial structure

Deformation-induced α_2/γ Interfaces in a Hot-deformed Ti-45Al-10Nb Alloy

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Journal of Materials Science & Technology 1998年第2期14卷 132-138页

作者： Jinguo WANG Lichun ZHANG and Guoliang CHEN (State Key lab. for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China )Henqiang YE(lab. of atomic imaging of solids, Institute of Metal Research, Chinese Academy State Key lab. for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China lab. of atomic imaging of solids Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

The structure change of α2/γ interface in a Ti-45Al-10Nb alloy induced by hot deformation was investigated by conventional and high-resolution transmission eIectron microscopy. Two types of hot deformation induced special α2/γ intedeces, coherent intedeces with high density of ledges and semi-coherent α2/γ intedeces were found to be due to the absorption of mobile dislocations into the α2/γ inteface. For the misoriented semi-coherent α2/γ interfaces, the densities of dislocation ledges increase with the misoriented angle between (111)γ and (0001)α2 planes, and 1/3[111] Frank partial dislocations were involved in the dislocation ledges. Formation mechanism of these deformation-induced α2/γ interfaces was discussed to be related to the role of α2/γ interface5 adjusting the deformation as a dislocation sink absorbing the slipping dislocations in the γ phase

关键词： Al Ti Interfaces in a Hot-deformed Ti-45Al-10Nb Alloy Deformation-induced

Simulation of Isotopic Angular Effects under Ion Bombardment of a^(92)Mo-^(100)Mo Target

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Journal of Materials Science & Technology 1997年第1期13卷 65-68页

作者： Liping ZHENG (Shanghai Institute of Nuclear Research, Chinese Academy of Sciences, Shanghai 201800, China)Risheng LI and Shuyou LI(lab. of atomic imaging of solids, Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110015, China) Shanghai Institute of Nuclear Research Chinese Academy of Sciences Shanghai 201800 China lab. of atomic imaging of solids Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

Under 5 keV Ar ion bombardment of a 92Mo-100Mo target, we have investigated isotopic angular effects by means of the static and the dynamic Monte Carlo programs. Our calculated results are in quantitative agreement with the measured and other calculated results. The conclusion consistences among theories. simulations and measurements are also discussed.

关键词： Mo Target Simulation of Isotopic Angular Effects under Ion Bombardment of a Target

HRTEM study on the ion-nitrided layers

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Chinese Science Bulletin 1995年第13期40卷 1137-1140页

作者：李凤照孙东升敖青戴吉岩李斗星 Shandong University of Technology Jinan 250014 laboratory of atomic imaging of solids Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China laboratory of atomic imaging of solids Institute of Metal Research Chinese Academy of SciencesShenyang 110015 China

At present, because the ion-nitriding technology is applied extensively in practice, manyresearchers in the materials science field have investigated the microstructure of theion-nitrided layer. However, the defect-formation mechanism and interface structureare not clear. The authors have already found that there were vacancies and other defectsin ion-nitrided layers. This note first obtains the high resolution images and the interfacestructure atomic images of different phases in the ion bombing-nitrided layers with a high res-olution transmission electron microscope (HRTEM) and discloses the structures and interfacestructures between phases in the nitrided layers at atomic size.

关键词： ion-nitrided layer microstructure structure ledge HRTEM.

Study on the Diffraction Patterns of α"-Fe_(16)N_2 with Jack-1 and Jack-2 Structural Parameters

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Journal of Materials Science & Technology 2000年第4期16卷 362-366页

作者： Zhiquan LIU and Douxing LI (laboratory of atomic imaging of solids, Institute of Metal Research, CAS, Shenyang 110015, China) Xiaolei XU, Liang WANG and Zukun HEI (Institute of Materials and Technology, Dalian Maritime University, Dalian 116026, China) laboratory of atomic imaging of solids Institute of Metal Research CAS Shenyang 110015 China Institute of Materials and Technology Dalian Maritime University Dalian 116026 China

Two body centered tetragonal (bet) crystal structures of α'-Fe_(16)N_2 with x=0.25, z=0.3125 (Jack-1) and x=0.222, z=0.306 (Jack-2) respectively, were analyzed theoretically with EMS software package. The simulation of diffraction patterns indicates that both diffraction patterns of the same axis in these two structures obey bcc extinction rule. The conclusion is also obtained from the analyses of the diffracted waves. α'-Fe_(16)N_2 precipitates in the diffusion layer of ion-nitrided α-iron have been studied with transmission electron microscope (TEM). We have distinctly observed the electron diffraction patterns of α'-Fe_(16)N_2 in [100], [111], [110], [011], [210], [021], [311], [113], [331] and [133] zone axes with perfect symmetry, which indicate the parallel orientation relationship with α matrix:α'//α'// {100}.α'// {100}ｔα. The analyses of diffraction patterns, which obey bcc extinction rule, verify the bct structure of α'-Fe_(16)N_2 discovered by X-ray diffraction.

关键词： Study on the Diffraction Patterns of Jack N2 with Jack-1 and Jack-2 Structural Parameters Fe