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Effects of the extrusion parameters on microstructure,texture and room temperature mechanical properties of extruded Mg-2.49Nd-1.82Gd-0.2Zn-0.2zr alloy

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 136-146页

作者： Chenjin Zhang Guangyu Yang Lei Xiao Zhiyong Kan Jing guo Qiang Li Wanqi Jie State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China College of Materials Science and Engineering Fuzhou UniversityFuzhou 350108China College of Chemistry and Environmental Science Qujing Normal UniversityQujing 655011China

Microstructure,texture,and mechanical properties of the extruded Mg-2.49Nd-1.82Gd-0.2Zn-0.2zr alloy were investigated at different extrusion temperatures(260 and 320℃),extrusion ratios(10:1,15:1,and 30:1),and extrusion speeds(3 and 6 mm/s).The experimental results exhibited that the grain sizes after extrusion were much finer than that of the homogenized alloy,and the second phase showed streamline distribution along the extrusion direction(ED).With extrusion temperature increased from 260 to 320℃,the microstructure,texture,and mechanical properties of alloys changed *** dynamic recrystallization(DRX)degree and grain sizes enhanced as the extrusion ratio increased from 10:1 to 30:1,and the strength gradually decreased but elongation(EL)*** the extrusion speed increased from 3 to 6 mm/s,the grain sizes and DRX degree increased significantly,and the samples presented the typical-rare-earth(RE)*** alloy extruded at 260℃ with extrusion ratio of 10:1 and extrusion speed of 3 mm/s showed the tensile yield strength(TYS)of 213 MPa and EL of 30.6%.After quantitatively analyzing the contribution of strengthening mechanisms,it was found that the grain boundary strengthening and dislocation strengthening played major roles among strengthening *** results provide some guidelines for enlarging the industrial application of extruded Mg-RE alloy.

关键词： Mg-rare earth alloys extrusion temperature extrusion ratio extrusion speed strengthening mechanisms

The evolution simulation of zinc finger domain sequence——Application of genetic algorithms in protein structure study

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Chinese Science Bulletin 1997年第22期42卷 1925-1928页

作者： Sun, zr Han, H Tsing Hua Univ Dept Biol Sci & Biotechnol Beijing 100084 Peoples R China

GENETIC algorithms are very efficient search mechanisms. The application of genetic algo-rithms in the protein structure study provides not only a convenience algorithm for the searchof the lowest energy status (accor... 详细信息

关键词： genetic algorithm zinc finger domain evolution simulation protein sequence.

MICROSTRUCTURES AND TEXTURES IN COLD-ROLLED ALUMINIUM STRIP

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中国有色金属学会会刊：英文版 1997年第3期7卷 26-30页

作者： Nie, zr Zhang, XM Yin, ZM CENT S UNIV TECHNOL DEPT MAT SCI & ENGNCHANGSHA 410083PEOPLES R CHINA

ＭＩＣＲＯＳＴＲＵＣＴＵＲＥＳＡＮＤＴＥＸＴＵＲＥＳＩＮＣＯＬＤＲＯＬＬＥＤＡＬＵＭＩＮＩＵＭＳＴＲＩＰ①ＮｉｅＺｕｏｒｅｎ，ＺｈａｎｇＸｉｎｍｉｎｇ，ＹｉｎＺｈｉｍｉｎＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳ... 详细信息

ＭＩＣＲＯＳＴＲＵＣＴＵＲＥＳＡＮＤＴＥＸＴＵＲＥＳＩＮＣＯＬＤＲＯＬＬＥＤＡＬＵＭＩＮＩＵＭＳＴＲＩＰ①ＮｉｅＺｕｏｒｅｎ，ＺｈａｎｇＸｉｎｍｉｎｇ，ＹｉｎＺｈｉｍｉｎＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａｎｄＥｎｇｉｎｅｒｉ...

关键词： aluminium alloy rolling microstructure texture deep drawing

Mechanical properties and simulated thermal conductivity of biomimetic structured PS-PVD(Gd_(0.9)Yb_(0.1))_(2)zr_(2)O_(7) thermal barrier coatings

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Journal of Materials Science & Technology 2024年第15期182卷 33-40页

作者： Yiqian guo Lei guo Keyi Liu Shiyi Qiu Hongbo guo Huibin Xu School of Materials Science and Engineering Beihang UniversityBeijing 100191China School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Chinese Aeronautical Establishment Beijing 100012China Tianmushan Laboratory Yuhang DistrictHangzhou 311115China Research Institute for Frontier Science Beihang UniversityBeijing 100191China

Plasma spray physical vapor deposition(PS-PVD)(Gd_(0.9)Yb_(0.1))_(2)zr_(2)O_(7)(GYbZ)thermal barrier coatings(TBCs)exhibited better silicate-phobicity than coatings produced by electron beam physical vapor *** combination with PS-PVD and ultrafast laser direct writing technology,biomimetic structured GYbZ TBCs,with a triple-scale micro/nano surface microstructure,were *** ablating on the PS-PVD GYbZ coating enhanced the surface roughness,improving its wear resistance without increasing the surface ***,during the laser ablation processing,numerous nanoparticles were deposited in-situ in the gaps between columns of the coating,reducing the coating Young’s *** simulated temperature field and heat flux field demonstrated that the presence of numerous interfaces between small columns of the PS-PVD coatings is beneficial to thermal ***,laser ablation decreased the coating thickness,reducing the thermal insulation by around 20%-30%as compared to its PS-PVD counterpart,suggesting that a moderate increase in the coating thickness should be considered when designing an efficient TBC system.

关键词： Thermal barrier coatings(TBCs) Plasma spray physical vapor deposition (PS-PVD) Laser ablation Biomimetic structure Mechanical properties Thermal insulation

Synthesis, structure and conformation of 1,3-difluorotetraphenyl benzene

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Chinese Journal of Chemistry 1996年第2期14卷 160-166页

作者： Zheng, zr Pan, YM Liu, WG Huan, ZW NANKAI UNIV DEPT CHEMNATL KEY LAB ELEMENTOORGAN CHEMTIANJIN 300071PEOPLES R CHINA

The compound trifluoroiodomethane can be activated to react with the electron donor, 1,4-dilithiotetraphenyl butadiene, by means of electron transfer catalysis (ETC). The structure of the product, 1,3-difluorotetraphenyl, benzene (1), was determined by MS, NMR, and X-ray single crystal diffraction. The conformations of compound 1 and its derivatives were analysized by molecular mechanics.

关键词： tetraphenylbenzene conformation molecular mechanics

A FINITE-ELEMENT ANALYSIS OF ELECTROMAGNETIC SHEET METAL-EXPANSION PROCESS

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中国有色金属学会会刊：英文版 1998年第3期8卷 135-140页

作者： Huang, SY Chang, ZH Wang, zr Wang, LF Yang, M Wuhan Automot Polytech Univ Sch Mat Engn Wuhan 430070 Peoples R China Harbin Inst Technol Sch Mat Sci & Engn Harbin 150006 Peoples R China

１ＩＮＴＲＯＤＵＣＴＩＯＮＥｌｅｃｔｒｏｍａｇｎｅｔｉｃｆｏｒｍｉｎｇ，ｅｓｅｎｔｉａｌｙｂｅｉｎｇａｋｉｎｄｏｆａｐｐｌｉｃａｔｉｏｎｏｆｉｍｐｕｌｓｅｉｎｔｅｎｓｉｖｅｃｕｒｅｎｔｔｅｃｈｎｉｑｕｅｉｎｍｅｔａｌ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＥｌｅｃｔｒｏｍａｇｎｅｔｉｃｆｏｒｍｉｎｇ，ｅｓｅｎｔｉａｌｙｂｅｉｎｇａｋｉｎｄｏｆａｐｐｌｉｃａｔｉｏｎｏｆｉｍｐｕｌｓｅｉｎｔｅｎｓｉｖｅｃｕｒｅｎｔｔｅｃｈｎｉｑｕｅｉｎｍｅｔａｌｗｏｒｋｉｎｇ，ｄｅａｌｓｗｉｔｈ...

关键词： finite element analysis electromagnetic forming magnetic pressure

Cooperative effects of Mo,V and zr additions on the microstructure and properties of multi-elemental Nb-Si based alloys

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Journal of Materials Science & Technology 2023年第1期132卷 27-41页

作者： Rui Ma Xiping guo State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China

Eight multi-elemental Nb-Si-based alloys with various Mo,V and zr contents were prepared by vacuum non-consumable arc *** cooperative alloying effects of Mo,V and zr on the arc-melted and heat-treated microstructure,mechanical properties as well as oxidation resistance at 1250°C of the alloys were evaluated *** results show that except for adding Mo solely,additions of Mo,V and zr change the microstructure from eutectic to *** additions of Mo,V and zr suppress the formation ofα(Nb,X)5 Si 3(“X”represents the alloying elements that substitute for Nb in the lattices),whilst promoting the formation ofγ(Nb,X)5 Si *** heat treatment at 1450°C for 50 h promotes the formation of(Nb,X)3 Si phase in the zr-containing *** with either Mo or zr improves,and their composite additions more obviously improve the compressive yield strength at 1250°C as well as the microhardness ofγ(Nb,X)5 Si *** room temperature fracture toughness of the alloys is enhanced by sole and composite additions of V and zr,while it is deteriorated by the addition of *** sole addition of Mo,V or zr improves the oxidation resistance at 1250°C,the composite additions of V with Mo/zr(especially V-Mo-zr)degrade the oxidation resistance at 1250°C.

关键词： Multi-elemental Nb-Si based ultrahigh temperature alloy Alloying effect Microhardness Room temperature fracture toughness High-temperature compressive yield strength Oxidation resistance

Syntheses and Characterization of Metal Complexes of　L－Lysine－N，N，N＇，N＇－tetraacetic　Acid　and　L－Lysine－N，N，N＇，N＇－tetramethylenepho　sphonic　Acid

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Chemical Research in Chinese Universities 1995年第3期11卷 276-278页

作者： ZHOU, RX LU, zr WEN, J WUHAN UNIV DEPT CHEMWUHAN 430072PEOPLES R CHINA

ＳｙｎｔｈｅｓｅｓａｎｄＣｈａｒａｃｔｅｒｉｚａｔｉｏｎｏｆＭｅｔａｌＣｏｍｐｌｅｘｅｓＯｆＬ－Ｌｙｓｉｎｅ－Ｎ，Ｎ，Ｎ＇，Ｎ＇－ｔｅｔｒａａｃｅｔｉｃＡｃｉｄａｎｄＬ－Ｌｙｓｉｎｅ－Ｎ，Ｎ，Ｎ＇，Ｎ＇－ｔｅｔｒａｍ... 详细信息

ＳｙｎｔｈｅｓｅｓａｎｄＣｈａｒａｃｔｅｒｉｚａｔｉｏｎｏｆＭｅｔａｌＣｏｍｐｌｅｘｅｓＯｆＬ－Ｌｙｓｉｎｅ－Ｎ，Ｎ，Ｎ＇，Ｎ＇－ｔｅｔｒａａｃｅｔｉｃＡｃｉｄａｎｄＬ－Ｌｙｓｉｎｅ－Ｎ，Ｎ，Ｎ＇，Ｎ＇－ｔｅｔｒａｍｅｔｈｙｌｅｎｅｐｈＯｓｐｈｏｎｉ...

关键词： L-Lysine Coniplex Relaxivity

Preparation of Dendrimers from Macromolecular Cores and Papain Immobilization

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Chinese Chemical Letters 1998年第3期9卷 263-264页

作者： Liu, LJ Shi, SH Zhuo, RX Lu, zr Wuhan Univ Dept Chem State Educ Commiss China Lab Biomed Polymer Mat Wuhan 430072 Peoples R China

Using amino-poly(ethylene glycol) and amino-propyl silica gel as initiator cores, two dendrimers were prepared by a two-step procedure. The progress of dendrimers during each step was monitored by infrared spectroscopy and elemental analysis. Papain was crosslinked to the solid dendrimer with silica gel core by glutaraldehyde, and the enzymatic activity of the immobilized papain kept almost unchanged after repeated usage for fifteen times.

关键词： amino-poly(ethylene glycol) amino-propyl silica gel dendrimer immobilized papain