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Interface Stability of the SiC Particles/Fe Matrix Composite System

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Journal of Wuhan university of Technology(materials science) 2006年第3期21卷 49-53页

作者：汤文明 school of materials science and engineering Hefei University of TechnologyHefei 230009China

The interface reaction between the SiC particles （ SiCp ） and Fe was stndicd during sintering the SiCp reinforced Fe matrix composites at 1423 K for 1 h. In the composite having 3wt% （weight ratio） SiCp （the 3SiCp/ Fe composite）, the interface reaction products of Fe3 Si, the carbon precipitates, and Fe3 C or pearlite were generated. Fe3 Si coustructs the bright matrix of the reaction zone in the original situation of the SiCp. The carbon precipitates are randondy embedded in the reaction zone. Fe3 C or pearlite exists at the grain boundaries of the Fe matrix. As increasing the SiCp concentration in the SiCp/ Fe composite, the inteusity of the interface reaction between SiCp and Fe iacreases. After the 10SiCp/ Fe composite （ having 10wt .% SiCp ） sintered at 1423 K for 1 h, all of SiCp are decomposed, and replaced by the reaction zone composed of Fe3 Si and the carbon precipitates. No Fe3 C or pearlite was genertaed during the reaction. The effects of the techniques of oxidizing of SiCp , coating SiCp by interaction with the Cr powder, and alloying the Fe matrix by adding the Cr element on the interface stability of the SiCp/ Fe composite system were also investigated, respectitely. The oxide membrane and the coating layer on SiCp can inhibit the interface reaction between SiCp and Fe by isolating SiCp from the Fe matrix during sintering. The interface reaction does not occur in the 3 SiCp/ Fe- 10 Cr composite but in the 3 SiCp/ Fe-5 Cr composite. In the SiCp/ Fe-Cr alloy composites, the interface reaction between SiCp and the Fe- Cr alloys is weaker than that between SiCp and Fe . The Cr element behaves as a diluent, it causes a redaction in the interface reaction, which is proportional to the amount of the element added.

关键词： interface reaction interface stability oxidation of SiC coating alloying

Thermal Stress in Free-standing Diamond Films with Cr Interlayer Destroyed

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Journal of materials science & Technology 2010年第11期26卷 991-995页

作者： Zheng Liu,Liangxian Chen,Chengming Li,Lifu Hei,Jianhua Song,Guangchao Chen,Weizhong tang and Fanxiu Lv school of materials science and engineering,university of science and Technology Beijing,Beijing 100083,china school of materials science and engineering University of Science and Technology Beijing Beijing 100083 China

Thermal stress in large area free-standing diamond films was remarkable during the post-deposition cooling of direct current （DC） arc plasma jet chemical vapor deposition （CVD） *** this research,the stress release caused by delamination of Cr interlayer was of great importance to ensure the integrity of free-standing diamond *** effects of Cr interlayer on Mo substrate,namely composite substrate,on thermal stress were ***-mechanical coupling analysis of the thermal stress was applied by finite element analysis （FEA） using ANSYS *** was found that the interlayer could be destroyed first by the large thermal stress,and then the stress could be released and the probability of diamond film crack initiation would be *** stress concentration at the bent edge of diamond film was also *** addition,diamond films deposited on Mo substrates with and without Cr interlayer were prepared by DC arc plasma jet CVD system and experimental measurements were used to characterize these *** was found that composite substrate could be an effective method of growing free-standing crack-free diamond films by DC arc plasma jet CVD system when there is no special requirement to the film strength.

关键词： CVD diamond film Cr interlayer Thermal stress Finite element analysis

Highly effective design of high GFA alloys with different metalbased and various components by machine learning

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science china(Technological sciences) 2024年第5期67卷 1431-1442页

作者： tang YiChuan HE YiFan FAN ZhuoQun WANG ZhongQi tang ChengYing Guangxi Key Laboratory for Informational materials School of Materials Science and EngineeringGuilin University of Electronic TechnologyGuilin541004China

The glass-forming ability(GFA)is of great significance for the development of novel functional metal-based metallic *** this study,seven popular machine learning(ML)algorithms were employed to design novel M-based(M=Fe,Co,Ni,Ti,Zr,and rare earth metal(RE))and X-component(X=2,3,4,5,6,and>6)alloys with excellent GFA.A GFA containing 6957 data points with structural analysis was *** engineering was used to analyze the importance and correlation of *** algorithms were utilized for GFA prediction,revealing that Xtreme Gradient Boosting Trees exhibited the strongest predictive capability,achieving a high accuracy of 94.0%,a true positive rate of 97.6%,and a root mean squared error of 0.3705 across the entire ***,the GFA of ternary to hexahydroxy alloys based on Fe,Co,Ni,Zr,Ti,and Y was predicted using all possible compositions generated through ***,a series of alloys with good GFA was successfully designed and *** present work suggests that the proposed ML method can be utilized to design novel multiple-M-based amorphous alloys with high GFA.

关键词： machine learning amorphous alloy feature engineering materials design glass forming ability

Novel cobalt base superalloy and its high-temperature flow behavior

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Rare Metals 2008年第3期27卷 292-298页

作者： tang Chunfeng PAN Feng QU Xuanhui DUAN Baihua WANG Tianjian HE Xinbo Laboratory of Advanced materials Department of Materials Science and Engineering Tsinghua University Beijing 100084 China school of materials science and engineering UniversiO of Science and Technology Beijing Beijing 100083 China

A novel cobalt base superalloy containing titanium and aluminum was investigated through metallography, tensile test, and high-temperature isothermal compression deformation. The results show that proper content of titanium and aluminum with can improve the strength and ductility of the cobalt base superalloy. The Co3（Ti,Al） compound with L12 structure precipitates when the novel superalloy is aged at 800℃ for 20 h. The e phase with hcp structure also precipitates when the superalloy is deformed by 28% and then aged at 650℃ for 4 h. The e phase can exist at 800℃. The superalloy has excellent high-temperature mechanical properties. Its maximum flow stress at 850℃ is in the range of 360-475 MPa when the strain rate is between 0.0021 and 2.1 s^-1. The flow stress of the superalloy during high-temperature deformation can be described by the Zener-Hollomon parameter with a hot deformation activation energy of 397 ***^-1.

关键词： cobalt base supemlloy microstrcture heat treatment hot compression deformation

Effect of Finish Rolling Temperature on Microstructure and Mechanical Properties of High Grade Pipeline Steel

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Journal of Iron and Steel Research International 2011年第S1期18卷 625-628页

作者： tang Xing-chang,KANG Yong-lin,BO Yan-yan (school of materials science and engineering,State Key Laboratory for Advanced Metals and materials,university of science and Technology Beijing,Beijing 100083,china) Univ Sci & Technol Beijing State Key Lab Adv Met & Mat Sch Mat Sci & Engn Beijing 100083 Peoples R China

The correlation among finish rolling temperature (FRT),microstructure and mechanical property of the high grade pipeline steel was investigated in this *** microstructure of the steels with different finish rolling temperatures was observed with scanning electronic microscope (SEM) and transmission electronic microscope (TEM).The martensite/austenite (M/A) islands distribution was fixed by colour metallography,and the mechanical properties of the steels were tested with quasi-static tensile testing *** result shows that the fraction of M/A island increased with the finish rolling temperature decreasing,and when the finish rolling temperature is 800℃,the mechanical properties are the best.

关键词： high grade pipeline steel finish rolling temperature martensite/austenite island

Theory,Method and Application of a State Recognition Based on Theory of Evidence

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International Journal of Minerals,Metallurgy and materials 1999年第1期13卷 69-72页

作者： Deling Zheng Xinbei tang Wei Fang (Information engineering school, university of science and Technology Beijing, Beijing 100083, china)(Peat Marwick Huazhen CPA Firm, 100020, china) Information engineering school University of Science and Technology Beijing Beijing 100083 China Peat Marwick Huazhen CPA Firm China

A new method of state recognition based on the theory of evidence was proposed. By this method, the plausible function which the sample awaiting recognition belongs to each category can be obtained through distance function. For the marginal samples,two or a batch of evidences can be combined and a new plausible function can be obtained by new evidence. Then the categories of samples can be determined according to plausibility function. This method provides a beder reasoning framework. The result proves the rate of recoghition correctness.

关键词： theory of evidence state recognition, heating furnace

Genetic Algorithm for the Thermal Stresses Optimum Design ofFunctionally Gradient Material Plate

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International Journal of Minerals,Metallurgy and materials 1999年第3期13卷 224-227页

作者： Xiaodan Zhang Zhengbin tang Changchun Ge(Applied science school, university of science and Technology Beijing, Beijing 100083, china) Applied science school University of Science and Technology Beijing Beijing 100083 China

Based on the thermal stress distribution for functionally gradient material (FGM) plates, a Genetic Algorithm (GA) method for the thermal stresses optimum design of FGM plate with computer technologies is given. The m... 详细信息

关键词： functionally gradient material (FGM) thermal stress Genetic Algorithm (GA) crossover mutation

Correlation between Thermal Expansion and Magnetic Characteristics of Fe-Ni Alloys in Fe_(1-x)Ni_x/Cu Superlattices

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International Journal of Minerals,Metallurgy and materials 1998年第3期12卷 169-174页

作者： Weizhong tang H Zabel(Matrial science and engineering school, university of science and Technology Beijing, Beijing 100083, china)(Institute of Experimental Physics/Solid State Physics, Ruhr university Bochum, 44780 Bochum, Germany) Material science and engineering school University of Science and Technology Beijing Beijing 100083 China Institute of Experimental Physics/Solid State Physics Ruhr University Bochum 44780 Bochum Germany

Thermal expansion behaviors of FeNi alloys were investigated by means of X-ray diffraction technique within a Fe1 -xNix/Cu superiattice structure. It was found that with a Ni concentration of x = 0.35, FeNi alloy layers showed the well-known Invar behavior, but for alloy layers with either lower or higher Ni concentrations, thermal expansion coefficients were larger. Based on results of magnetic measurements it is concluded that FeNi alloy layers with Ni concentrations lower than the Invar composition are in a superparamagnetic state which leads not only to low spontaneous magnetizations but also to large thermal expansions of the alloy layers.

关键词： thermal expansion Invar behavior FeNi alloys superlattice magnetism

A supramolecular self-assembly material based on cucurbituril and cationic TPE as ultra-sensitive probe of energetic pentazolate salts

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Defence Technology（防务技术） 2024年第5期35卷 69-76页

作者： Boan tang Jingxiang Zhong Shutao Wang Shiyu Zhou Yongxing tang Wei Huang school of Chemistry and Chemical engineering Nanjing University of Science and TechnologyNanjing 210094China

The successful synthesis of the pentazolate anion(cyclo-N-5)has been a great breakthrough in the field of energetic ***,the detection methods for these energetic materials based on the pentazolate anion are quite ***,two fluorescent probes for cyclo-N-5anion were *** 1(TPE2N)was synthesized with a tetraphenylethylene functionalized by two cationic groups which can generate strong electrostatic interactions with pentazolate anion and result in specific fluorescent *** 2 was designed based on sensor 1 and supramolecular cucurbit[7]uril(CB[7]).The unique structural features of CB[7]provide sites for the interaction between the cations and N-5anion in its cavity,which would generate a platform for the detection and enhance the recognition *** titration calorimetry(ITC)experiment and fluorescence titration experiment indicate the binding molar ratio between sensor 1 with CB[7]is 1:*** sensors display typical aggregation-induced emission(AIE)features and good *** sensors demonstrate excellent sensitivity to pentazole hydrazine salt with high enhancement constant(sensor 1:1.34×10^(6);sensor 2:3.78×10^(6))and low limit of detection(LOD:sensor 1=4.33μM;sensor 2=1.54μM).The formation of an AIE-based supramolecular sensor effectively improves the sensitivity to *** addition,the probes also have good selectivity of N-5anion *** research would shed some light on the design of novel fluorescent sensors to detect pentazolate-based molecules and provides an example of supramolecular chemistry combined with fluorescent probes.

关键词： Pentazolate anion Explosives detection Aggregation-induced emission(AIE) Host-guest interaction