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Oxidation-induced strengthening behavior of reaction formed Al_4SiC_4 ceramics

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Rare Metals 2007年第S1期26卷 94-98页

作者： HUANG Xiaoxiao1,2),WEN Guangwu1,3),LIU Ruitang2),and ZHENG Xin1)1) school of materials science and Technology,Harbin Institute of Technology,Harbin 150001,china 2) school of material science and Chemical engineering,Harbin engineering University,Harbin 150001,china 3) school of materials science and Technology,Harbin Institute of Technology at Weihai,Weihai 264209,china Harbin Inst Technol Sch Mat Sci & Technol Harbin 150001 Peoples R China Harbin Inst Technol Sch Mat Sci & Chem Engn Harbin 150001 Peoples R China Harbin Inst Technol Sch Mat Sci & Technol Weihai 264209 Peoples R China

The bending strengths of Al4SiC4 ceramics were investigated from room temperature to 1300 ℃ in air and in vacuum,*** is a novel property that the bending strength increases with increasing test temperatures up to 1300 ℃ in *** strength value of Al4SiC4 ceramics is 449.7 MPa at 1300 ℃ in air,which is about 1.5 times of that at room temperature(300 MPa).The self-healing behavior of the flaws on the specimen surface due to the oxidation of the surface layer of the Al4SiC4 ceramics is considered as the main enhancement mechanism at high temperatures.

关键词： calcination and hot pressing surface strength Al_4SiC_4

DEFORMATION ENHANCED FERRITE TRANSFORMATION IN PLAIN LOW CARBON STEEL

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Acta Metallurgica Sinica(English Letters) 2001年第2期14卷 115-121页

作者： Z.Q. Sun, W Y. Yang, A.M. Hu and P. Yang (State Key Laboratory for Advanced Metals and materials, University of science and Technology Beijing, Beijing 100083, china) (school of material science and engineering, University of science and Technology Beijin Beijing Univ. of Sci. and Eng. Beijing 100083 China

The microstructure evolution during deformation enhanced transformation of undercooled austenite of a plain low carbon steel has been investigated by means of hot compression simulation experiment under various conditions of strain rate, deformation temperature and strain. The effect of austenite grain size on the strain enhanced ferrite transformation has been studied. The ferrite dynamic recrystallization involved in successive hot deformation has been explored.

关键词： deformation enhanced transformation undercooled austenite.plain low carbon steel microstructure refinement

Controllable synthesis of Ni-catalyzed tetragonal tungsten nanowires via chemical vapor deposition

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Progress in Natural science:materials International 2012年第5期22卷 514-519页

作者： Chao Wang a,Yuehui He a,Chaoqun Peng b,Shiliang Wang a,c,Xinli Liu a a State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,china b school of material science and engineering,Central South University,Changsha 410083,china c school of Physics science and Technology,Central South University,Changsha 410083,china State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China school of material science and engineering Central South University Changsha 410083 China school of Physics science and Technology Central South University Changsha 410083 China

Tetragonal single-crystal tungsten nanowires were successfully synthesized by chemical vapor deposition(CVD) catalyzed by Ni *** influences of the catalysts,temperature and growth time on the formation of the nanowires were *** was found that the tetragonal tungsten nanowires(WNWs) arrays were obtained by deterministic growth from the ordered Ni catalyst particles with one-to-one relation in size and position between the catalysts and *** large-scale tungsten nanowire arrays were synthesized at the low temperature of 950℃.Samples were characterized by X-ray diffraction(XRD),field-emission scanning electron microscopy(FE-SEM),transmission electron microscopy(TEM) and high-resolution transmission electron microscopy(HRTEM).Increasing growth time at 950℃,the tip of the WNWs changed from four(211) planes to four(110) *** controls of the orientation and structure of WNWs arrays were important for adjusting their properties to satisfy different requirements of potential nanodevices.

关键词： Tungsten nanowires Ni catalysts Chemical vapor deposition Nanostructures

Microstructures and corrosion properties of casting in situ Al_3Ti-Al composites

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Rare Metals 2010年第1期29卷 78-85页

作者： CHEN Tijun LI Jian HAO Yuan Gansu Key Laboratory of Advanced Nonferrous materials Lanzhou University of Technology Lanzhou 730050 China school of material science and engineering Xi＇an Shiyou University Xi ＇an 710065 China

The effects of Ti content and the alloying elements of Si and Cu on the microstructures of casting in situ Al3Ti-Al composites were investigated. Simultaneously, their corrosion properties were also discussed. The results indicate that the aspect ratios of Al3Ti platelets in different Al based composites are different although all of them are in flaky shape. The morphologies of Al3Ti phase are not only determined by Ti content, but are also related to the alloying elements. The grain refining role of Al3Ti phase in the pure Al and Al-Cu based composites is more effective than that in the Al-Si based composite. The addition of Ti decreases the corrosion resistance of pure Al and Al alloys. The corrosion resistances of the composites are dependent on both the corrosion characteristics of the corresponding matrixes and the distribution of Al3Ti platelets.

关键词： metal matrix composite microstructure corrosion resistance alloying element morphology

Distribution Features of the Residual Stress For T-Joints by Laser Welding

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稀有金属材料与工程 2011年第S4期40卷 130-133页

作者： He Enguang1,Gong Shuili1,Wu Bing1,2,Chen Li1 1science and Technology on Power Beam Processes Laboratory,AVIC Beijing Aeronautical Manufacturing Technology Research Institute,Beijing 100024,china 2 school of material science and engineering,Xi`an Jiaotong University,Xi`an 710049,china AVIC Beijing Aeronaut Mfg Technol Res Inst Sci & Technol Power Beam Proc Lab Beijing 100024 Peoples R China Xi An Jiao Tong Univ Sch Mat Sci & Engn Xian 710049 Peoples R China

The residual stress of T-joints for SUS304 stainless steel by YAG laser welding was measured by the method of hole-drilling,and the effects of heat treatment and hardness distribution of weld joints on the distribution of residual stress for T-joints were *** results showed that the maximum of longitudinal residual tensile stress for T-joints was about *** maximum of residual stress was not more than 40MPa after heat treatment,the peak of residual stress reduced *** gradient of residual stress distribution was also reduced *** hardening phenomenon occurred for T-joints,and the hardness of weld and heat affected zone was both higher than the hardness of base metal,the peak of hardness occurred in the fusion *** effect of strain hardening phenomenon of weld and heat affected zone on the residual stress distribution of T-joints for SUS304 stainless steel was obvious,which made longitudinal residual tensile stress become higher.

关键词： stainless steel laser welding T-joints heat treatment

Preparation and Antibacterial Activity of Ag+ and Zn2+ Synergized Doped Al2O3

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Preparation and Antibacterial Activity of Ag+ and Zn2+ Syner...

Enhanced Surface Properties Induced by High Current Pulsed Electron Beam (HCPEB) Treatment

2010 4th International Conference on Intelligent Information Technology Application (IITA2010)

作者： Xiushu Tian school of material science and engineering Shijiazhuang TieDao University Shiajizhuang 050043 chinaShuxia Ren school of material science and engineering Shijiazhuang TieDao University Shiajizhuang 050043 china Chenjing Lv school of material science and engineering Shijiazhuang TieDao University Shiajizhuang 050043 china

Silver is known to have a wide antibacterial spectrum and relatively high safety,but the prices of silver are so high that it is difficult to popularize *** this paper,the Ag+ and Zn2+ are together used as antibacterial ions to economize the *** Al2O3 antibacterial agent carrying Ag+ and Zn2+ was prepared by ion adsorption ***+ content,Zn2+ content and sintering temperature were discussed in the paper,and the structures were characterized by *** results show that the composite material has good antibacterial *** better quantity of Ag+ is 4%,the suitable Zn2+ content is 3% and the better sintering temperature range is 600℃～1100℃.The reasons for good antibacterial activities are that silver and zinc ions can enter the framework of Al2O3 powder through ion adsorption and are released slowly owing to its porosity.

关键词： Composite antibacterial agent Containing silver and zinc ions Antibacterial activities

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稀有金属材料与工程 2011年第S4期40卷 178-180页

作者： Hao Shengzhi1,2,Wang Huihui1,2,Li Mincai1,3,Xu Yang1,3,Dong Chuang1,3 1Key Laboratory of materials Modification by Laser,Ion and Electron Beams,Ministry of Education,Dalian University of Technology,Dalian 116024,china2school of Physics and Optoelectronics engineering,Dalian University of Technology,Dalian 116024,china3school of material science and engineering,Dalian University of Technology,Dalian 116024,china Dalian Univ Technol Minist Educ Key Lab Mat Modificat Laser Ion & Electron Beams Dalian 116024 Peoples R China Dalian Univ Technol Sch Phys & Optoelect Engn Dalian 116024 Peoples R China Dalian Univ Technol Sch Mat Sci & Engn Dalian 116024 Peoples R China

High current pulsed electron beam (HCPEB) has been developed as a useful tool for surface treatment of *** the present work,the fundamental principle of HCPEB source was described along with the device configuration and working *** the different kinds of HCPEB surface treatment experiments conducted,the enhanced surface properties induced by HPCEB treatment were illustrated and explained with their microstructure characterization results.

关键词： high current pulsed electron beam surface treatment microstructure property

Study on Synergic Risk Management Mode for Occupational Hazards in Workplace

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Study on Synergic Risk Management Mode for Occupational Haza...

Investigation on the sintering behavior of SiC/Cu composites

2011 International Conference on Management science and Intelligent Control(ICMSIC 2011)

作者： TIAN Yanqing school of material science and engineering Xi’an University of Architecture&Technology Xi’an china YANG Zhenhong school of material science and engineering Xi’an University of Architecture&Technology Xi’an china

The occupational hazards management in workplace involves occupational hazards identification,hazards analysis, hazards assessment,hazards warning and intervention,hazards management and continuous *** paper mostly discusses how to effectively carry out occupational hazards management work in the aspects mentioned *** analyses 5 levels of occupational hazards administrators,including management level,operating level,supporting level,supervision level and coordinative level,5 stages of the occupational diseases process, including incubation period,growth period,critical period,occurring period and disposal period,and 5 sectors of management resources,including software,hardware,environment,human and ***,a mode for occupational hazards management based on the 5 levels,5 stages and 5 resources synergy is ***,a case study is analyzed in *** example shows that this mode is suitable to occupational hazards management in workplace and provides a new idea for occupational hazards prevention and control of enterprise and occupational hazards supervision of ***,it may be a reference for establishing a synthetic system with dynamic management for occupational hazards in workplace.

关键词： workplace occupational hazards risk management synergic mode

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Investigation on the sintering behavior of SiC/Cu composites