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FUNdAMENTAL PROBLEMS IN PULSEd-BIAS ARC dEPOSITION

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Acta Metallurgica Sinica(English Letters) 2002年第1期15卷 91-103页

作者： G.q. Lin Z.F. ding d. qi N.H. Wang M.d. huang d.Z. Wang Y.N. Wang C. dong L.S. Wen Lab. for Mat. Modification by Laser Ion and Electron. Beams Dalian Univ. of Technol. Dalian 116024 China

Arc deposition, a widely used surface coating technique, has disadvantages such as large droplet size and high deposition temperature. Recent trend in its renovation is the introduction of pulsed bias at the. substrate. The present paper attempts to describe the deposition process of TiN films using this technique with emphasis laid on the understanding of the basic problems such as discharge plasma properties, temperature calculation, and droplet size reduction. We show that this technique improves the film micro structure and.q.ality, lowers deposition temperature, and allows coatings on insulating substrates. After analyzing load current oscillation behaviors, we have determined that the plasma load is of capacitance nature due to plasma sheath and that it is equivalent to a circuit element consisting of parallel capacitance and resistance. At last, we point out the remaining problems and future development of the pulsed-bias arc deposition technique.

关键词： arc deposition pulsed bias plasma

THE CONVERGENCE OF MULTIGRId METHOdS FOR SOLVING FINITE ELEMENT EqUATIONS IN THE PRESENCE OF SINGULARITIES

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Journal of Computational Mathematics 1995年第4期13卷 315-324页

作者： Y.q. huang Y.X. Li(depariment of Mathematics, Xiangtan University, Hunan, China) 湘潭大学数学系湖南湘潭

We analyze the convergence of multigrid methods applied to finite elementequations of second order with singularities caused by reentrant angles and abruptchanges in the boundary conditions. Provided much more weaker demand of clas-sical multigrid proofs, it is shown in this paper that, for symmetric and positivedefinite problems in the presence of singularities, multigrid algorithms with evenone smoothing step converge at a rate which is independent of the number of lev-els or unknowns. Furthermore, we extend this result to the nonsymmetric andindefinite problems.

关键词： Pro THE CONVERGENCE OF MULTIGRId METHOdS FOR SOLVING FINITE ELEMENT EqUATIONS IN THE PRESENCE OF SINGULARITIES

Plastic Strain Energy Model for Rock Salt Under Fatigue Loading

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Acta Mechanica Solida Sinica 2018年第3期31卷 322-331页

作者： M.M.He N.Li B.q.huang C.H.Zhu Y.S.Chen Institute of Geotechnieal Engineering Xi'an University of TechnologyXi'an 710048China State Key Laboratory of Eco-hydraulics in Northwest Arid Region Xi'an University of TechnologyXi'an 710048China College of Information Engineering and Automation Kunming University of Science and TechnologyKunming 650500China Shaanxi Key Laboratory of Loess Mechanics and Engineering Xi'an University of TechnologyXi'an 710048China

The fatigue test for rock salt is conducted to investigate the effects of stress ampli- tude, loading frequency and loading rate on the plastic strain energy, from which the evaluation rule of the plastic strain energy is analyzed, which is divided into three stages： cyclic hardening, saturation and cyclic softening. The total accumulated plastic strain energy only depends on the mechanical behavior of rock salt, but is immune to the loading conditions. A novel model for fatigue life prediction is proposed based on the invariance of the total plastic dissipation energy and the stability of the plastic energy per cycle.

关键词： Rock salt Fatigue life Plastic energy

dispersion of Ultrafast Optical Kerr Effect in No-aggregation Phthalocyanine Molecules

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Chinese Physics Letters 1997年第2期14卷 96-99页

作者： GONG qi-huang T.Isoshima M.q.Tian T.Wada H.Sasabe department of Physics Mesoscopic Physics LaboratoryPeking UniversityBeijing 100871 Frontier Research Program Institute of Physical and Chemical Research(RIKEN)WakoSaitama 351-01Japan

We report dispersion property for femtosecond optical Kerr effect in the solutions of no-aggregation 16(trifluoro ethoxy1)vanadyl phthalocyanine in the wavelength range of 850-770 *** optical Kerr effect spectrum show... 详细信息

关键词： optical dispersion effect

Review on Hydrogen Embrittlement of Press-hardened Steels for Automotive Applications

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Acta Metallurgica Sinica(English Letters) 2023年第7期36卷 1123-1143页

作者： Z.Wang q.Lu Z.H.Cao H.Chen M.X.huang J.F.Wang General Motors China Science Lab Shanghai201206China department of Mechanical Engineering The University of Hong KongPokfulam RoadHong Kong999077China Key Laboratory for Advanced Materials of Ministry of Education School of Materials Science and EngineeringTsinghua UniversityBeijing100084China

Press-hardened steel(PHS)with an ultimate tensile strength(UTS)of 1500 MPa has been widely used in automotive body-in-white in the last two decades,due to its ultra-high strength and excellent formability that is achieved by hot stamping ***,the application of PHS with UTS exceeding 1500 MPa in automotive industry could be deferred due to the increased risk of hydrogen *** reduce this kind of risk,recent research efforts have been focused on various ways to optimize the microstructure of *** present review intends to summarize these efforts,to highlight present solutions to address hydrogen embrittlement,and to shed light on directions for future *** influence of microstructure on the hydrogen embrittlement of PHS has been discussed in terms of both the steel substrate and the surface *** substrate part covers the influence of martensite,carbides,inclusions,and retained austenite,while the surface part covers decarburization and oxidation,pre-coating,and trimming.

关键词： Hot stamping Press-hardened steels Coating-free Hydrogen embrittlement Fracture Al-Si coating

Construction of hollow mesoporous silica nanoreactors for enhanced photo-oxidations over Au-Pt catalysts

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National Science Review 2020年第11期7卷 1647-1655页

作者： Hao Tian Jinhui Zhao Xinyao Wang Lizhuo Wang Hao Liu Guoxiu Wang Jun huang Jian Liu G.q.(Max) Lu State Key Laboratory of Catalysis Dalian Institute of Chemical Physics (DICP)Chinese Academy of Sciences Centre for Clean Energy Technology School of Mathematical and Physical SciencesFaculty of ScienceUniversity of Technology Sydney Laboratory for Catalysis Engineering School of Chemical and Biomolecular Engineering Sydney Nano Institute The University of Sydney dICP-Surrey Joint Centre for Future Materials Department of Chemical and Process Engineering and Advanced Technology Institute University of Surrey University of Surrey

It is highly desirable to design hollow structures with multi-scale functions by mimicking cells for the construction of micro/nanoreactors. Herein, we report the construction of hollow-structured submicrometer-photoreactors with bimetallic catalysts loaded within mesoporous silicas. The synthesis parameters are optimized to study the evolution of hollow structure through hydrothermal treatment and an ‘adhesive-contraction’ formation mechanism is proposed. Au Pt@HMZS catalysts exhibited a broader absorbance region under visible light and the adsorption edge displayed a red-shift, indicating the strong metal–metal interactions at the alloy interface. The reaction performance of the coupled Au-Pt catalysts can be tuned to achieve excellent catalytic activity in cinnamyl alcohol oxidation to cinnamic acid for 3.1 mmol g-1with 99%selectivity. The proposed strategy to build hollow structures as multifunctional micro/nanoreactors is promising for the design of high-performance and sustainable catalysts for chemical synthesis.

关键词： nanoreactors photocatalytic oxidation metal nanoparticles mesoporous materials surface plasmonic resonance

A STUdY ON AGING TREATMENTS FOR ALLOY 2195

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Acta Metallurgica Sinica(English Letters) 1998年第1期11卷 45-50页

作者： B.P.huang Z.q.Zheng

Effects of various aging treatments on mechanical properties and microstructure of alloy 2195 have been investigated. The experimental results showed that a promising combination of strength and ductility was achievable under T8 temper. The lower aging temperature reduced subgrain-or grain-boundary T1 precipitation and favored uniform dispersion of T1 phases, resulting in better strength and ductility. Prior deformation improved aging strength with promising ductility. Pre-aging after prior deformation had little effect on the age-hardening behavior of alloy 2195.

关键词： Al alloy 2195,aging mechanical property microstructure

STRENGTHENING CAST IRON MATRIX BY ALLOYINGELEMENTS WITH POSITIVE ANd NEGATIVESEGREGATION

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Acta Metallurgica Sinica(English Letters) 1997年第4期10卷 329-332页

作者： Fan, Z.K. Wang, Y.q. Liang, S.H. huang, H.S. Xi'an Univ of Technology Xi'an China

The combinational use of alloying elements with positive and negative segregation has been shown to be very effective in strengthening the matrix of cast iron. Negative segregation alloying elements, Cu and Si, make the inner parts of dendritic austenites and eutectic cells get good hardenability. On the contrary, positive segregation alloying elements Cr and Mn make the outer parts of dendrites have higher microhardness. Appropriate combination of the above two types of alloying elements can produce a uniform microhardness and high strength in gray cast irons.

关键词： Cast iron Chromium Copper Hardness Manganese Segregation (metallography) Silicon Strengthening (metal)

THERMOdYNAMIC PARAMETERS IN THE NUCLEATION OF LIqUId IRON

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Acta Metallurgica Sinica(English Letters) 2003年第6期16卷 519-523页

作者： C.huang B.Song J.H.Mao q.Lin P.Zhao UniversityofScienceandTechnologyBeijing Beijing100083China CentralIronandSteelResearchInstitute Beijing100081China

By using of electrolytic pure iron, the specimens containing different oxide content were made in a Mo wire furnace. The dTA method was employed to measure the undercooling of liquid iron during solidification. The relations between the cleanness of liquid iron and undercooling, thermodynamic driving force of nucleation, the nucleus forming energy, as well as the critical radius of nucleus have been investigated. The results showed that with the increase of cleanness of liquid iron the undercooling and thermodynamic driving force increased, while the nucleus forming energy and critical radius of nucleus decreased.

关键词： pure iron cleanness undercooling thermodynamic parameter