检索结果-南通市图书馆

Microstructure Evolution in a Rapidly Solidified Cu85Fe15 Alloy Undercooled into the Metastable Miscibility Gap

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2005年第5期21卷 759-762页

作者： Jie HE and Jiuzhou ZHAOInstitute of Metal Research, Chinese Academy of Sciences, shenyang 110016, China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

A model has been developed to describe the microstructure evolution in the atomized droplets of Cu-Fe alloy during cooling through the metastable miscibility gap. Calculations have been performed for Cu85Fe15 alloy to investigate the process of liquid-liquid phase transformation. The numerical results indicate that the minority phase droplets are nucleated in a temperature region around the peak of the supersaturation. The average radius of the Fe-rlch droplets decreases and the number density of the minority phase droplets increases with decreasing the atomized droplet size. The simulated results were compared with the experimental ones. The kinetic process of the liquid-liquid phase transformation was discussed in detail.

关键词： Cu-Fe alloy Metastable miscibility gap Liquid-liquid phase transformation Microstructure evolution Modeling

RESEARCH ON NEGOTIATION-BASED PARTNER SELECTION APPROACH

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2002年第1期15卷 15-21页

作者： Li Li Xue Jinsong Zhu Yunlong shenyang Institute of Automation，Chinese Academy of Science，shenyang 110016，China shenyang Institute of Automation Chinese Academy of Science Shenyang 110016

The key problem in the construction of virtual enterprises (VEs) is how toselect appropriate partners. The negotiation-based approach is proposed to support partner selectionin the construction of VEs. The negotiation model is discussed from three main aspectsrespectively, i.e., negotiation protocol, negotiation goal and negotiation decision-making *** the generic mathematical description of the negotiation model is formally presented. Finally, asimple example is used to validate the approach's availability.

关键词： Negotiation Partner selection Virtual enterprises

Analysis on Summer Precipitation Efficiency in shenyang

在线全文

学校读者我要写书评

暂无评论

Meteorological and Environmental Research 2011年第5期2卷 35-37页

作者： BAN Xian-xiu,FANG Bin Weather Modification Office of Liaoning Province,shenyang 110016,China

[Objective] The research aimed to analyze summer precipitation efficiency in shenyang.[Method] By using the method which estimated the cloud water resource,based on the vertical accumulated liquid water content which was observed by 'QFW-1 dual-channel microwave radiometer' and the rain intensity data which had 1min interval and were inverted by 'particle laser-based optical measurement' (Parsivel),the precipitation efficiency in shenyang area during July-August,2007 was analyzed.[Result] When the rain intensity I<7.5 mm/h,the precipitation efficiency E was stable and was during 3.2%-2.7%.The average value was 3.0%.When the rain intensity I ≥7.5 mm/h,the precipitation efficiency E presented the linear increasing as the rain intensity I *** bigger the rain intensity was,the more the remaining liquid water content in the air was,and the bigger the artificial precipitation potential was.[Conclusion] The research provided the guidance role for analyzing the cloud water resource in the air and the artificial precipitation potential.

关键词： Precipitation efficiency Summer Liquid water content Rain intensity shenyang China

Strain-induced Microstructure Refinement in a Tool Steel Subjected to Surface Mechanical Attrition Treatment

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2010年第3期26卷 258-263页

作者： Shoudan Lu,Zhenbo Wang and Ke Lu shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,shenyang 110016,China shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

A nanostructured surface layer has been fabricated on an AISI H13 tool steel by means of surface mechanical attrition treatment （SMAT）.Strain-induced refinement processes of ferrite grains and carbide particles have been investigated by transmission electron microscopy （TEM） and scanning electron microscopy （SEM） in the SMAT surface *** refinement of ferrite is found to be dominated by dislocation activities and greatly facilitated by a large number of carbide particles at a depth 〉20 μ*** comparisons with microstructure refinement processes in other SMAT ferrite steels indicate that a larger volume fraction of carbide particles with a lower shear strength is expected to facilitate the refinement process of ferrite grains.

关键词： Nanostructured and nanocrystalline material AISI H13 tool steel Grain refinement Surface mechanical attrition treatment (SMAT) Carbides

Vibration Effects on the Structural Stability of Al-Ti Intermetallics by First-principles Calculations

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2010年第12期26卷 1071-1077页

作者： Hui Zhang and Shaoqing Wang shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,shenyang 110016,China shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

The structural stability of the intermetallics AlTi3, Al2Ti, Al3Ti4 and Al3Ti in the Al-Ti system has been investigated using density functional theory （DFT） and density functional perturbation theory （DFPT）. The calculated ground-state convex hull is in agreement with the experimental researches. Al3Ti4 （hP7） is metastable at 0 K and may be stabilized as the temperature increases due to the effects of the vibration entropy. For Al2Ti, r-Al2Ti is stable at 0 K and h-Al2Ti is stabilized by the vibration entropy at high temperatures. Al3Ti （tI16） is unstable considering vibration effects and Al3Ti （tI8） is the most stable structure at 0 K.

关键词： First-principles Al-Ti Vibration Crystal structure

Influences of Alloying Elements W, Mo, Cr and Nb on Retained Beta Phase in 47Al Based near γ-TiAl Alloys

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2003年第4期19卷 330-333页

作者： Limin DONG and Rui YANGInstitute of Metai Research, Chinese Academy of Sciences, shenyang 110016, China Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

The influences of alloying elements W, Mo, Cr, and Nb on retained ft phase in 47AI based near 7-TiAI alloys have been studied. The results reveal that the amount of retained β phase is increased by the addition of Cr, Mo, W in rising rank, although the distribution of β phase in Cr-bearing alloys is different from that of Mo- or W-bearing alloys. For Nb-doped alloys, no retained ft was found even when 5 at. pct Nb was added. The as-cast microstructural features and the distribution of the b phase in the different alloy families were compared and interpreted in terms of the different segregation behaviour of these elements in Ti.

关键词： γ-TiAl Alloying elements Microstructure Retained β phase

Cu Ions Dissolution from Cu-bearing Antibacterial Stainless Steel

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2010年第10期26卷 941-944页

作者： Li Nan and Ke Yang Institute of Metal Research,Chinese Academy of Sciences,shenyang 110016,China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

This work addressed the antibacterial mechanism of copper ions dissolved from the Cu-bearing antibacterial stainless steel in the bacterial solution by electrochemical measurements and X-ray photoelectron spectroscopy （XPS）.Experimental results showed that the antibacterial rate reached over 99.9% only when the reaction time between the antibacterial stainless steel and Escherichia coli （***） lasted for 9 h,and the antibacterial stainless steel was more susceptible to the corrosion in the bacterial solution,which was attributed to more copper ions dissolved from surface of the steel contacted with the bacteria,a crucial reason leading to death of the bacteria.

关键词： Antibacterial stainless steel Copper ions Corrosion Escherichia coli (E.coli)

Microstructure Investigation on the Triple Junction with an Adjoining Twin Boundary in Nanocrystalline Palladium

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2010年第11期26卷 1047-1050页

作者： Yuchen Wang,Zhenxing Su and Dehai Ping shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,shenyang 110016,China shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

By using high-resolution transmission electron microscopy,a [110] triple junction （TJ） containing a twin boundary （TB） in nanocrystalline palladium has been observed along the common axis *** statics calculation and imaging simulation were performed to determine the atomic structure of the *** modeling structure exhibits that the adjoining TB is a distorted one,whilst other two adjoining grain boundaries （GBs） exist in steady equilibrium *** present observation gives a clear example demonstrating that the adjoining TB can release the larger stresses residing at the junction.

关键词： Triple junction Grain boundary Molecular statics High-resolution transmission electron microscopy (HRTEM)

Preparation and Characterization of Polyaniline Nanofibers by Template-free Method

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2005年第2期21卷 179-182页

作者： Xuemei GUO, Kun LUO and Nanlin SHI Institute of Metal Research, Chinese Academy of Sciences, shenyang 110016, China Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

In the presence of p-toluene sulfonic acid (TSA) as a dopant, polyaniline (PAni) nanofibers, (about 80^-65 nm in diameter) were successfully synthesized with a chemical template-free method. It was found that the formation probability, morphology, and diameter of the resulting PAni-TSA nanofibers were sensitive to the synthetic conditions, such as reaction temperature, the molar ratio of TSA to aniline, and the concentration of TSA in the polymerization media. The molecular structure was characterized by using the FT-IR, Raman spectra and X-ray diffraction, which shows that the main chain structure of PAni-TSA nanofibers was in agreement with that of granular PAni.

关键词： Polyaniline p-toluene sulfonic acid Nanoflbers Template-free method