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Effects of a high magnetic field on single-phase interface evolution,additional interfacial energy and nucleation undercooling in Al-based alloy

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Journal of Materials Science & Technology 2023年第23期154卷 43-53页

作者： Lin Wang Zhipeng long long hou Song Yan Baode Sun Xi Li Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming Shanghai Jiao Tong University Shanghai 200240 China State Key Laboratory of Advanced Special Steels Shanghai University Shanghai 200072 China

The effects of a high magnetic field on the evolution of the single-phase interface and the liquid-solid interface energy in Al-Cu alloy were investigated *** is found that the application of the magnetic field has a significant promotion effect on the migration of liquid droplets,accelerating the formation of the single-phase *** should be attributed to the thermoelectric(TE)magnetic convection in the droplets which has enhanced the diffusion and increased the migration speed of liquid ***,the effect of the high magnetic field on the solid-liquid interface energy is analyzed by an improved grain boundary groove(GBG)*** average solid-liquid interface energy of theα-Al/Al-Cu and Al2Cu/Al-Cu systems increases and decreases with the increase of the magnetic field,*** above experiment results are well explained based on the formation and interaction of the magnetic dipole at the solid-liquid ***,experimental results reveal that the magnetic-field-induced interface energy increases and decreases the nucleation undercooling of the Al-30wt.%Cu alloy and Al-35wt.%Cu alloy,*** studying the effect of the magnetic-field-induced interface energy on the nucleation undercooling,the understanding of the interface energy-induced nucleation undercooling deepens.

关键词： High magnetic field Interface energy Nucleation undercooling Grain boundary groove

Addition of Allyltrimethylsilane to tert-Butanesulfinyl Imines Triggered by Tetra-n-butylammonium Fluoride

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Chinese Chemical Letters 2006年第8期17卷 1037-1040页

作者： Wan Xuan ZHANG Xue long hou Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules Faculty of Chemistry and Material Science Hubei University Wuhan 430062 State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai 200032

The addition of allyltrimethylsilane to tert-butanesulfinyl imines triggered by tetra-n-butylammonium fluoride （TBAF） in the presence of 4A molecular sieves has been studied, and homoallylsulfinamides were obtained ... 详细信息

关键词： Stereoselective addition tert-butanesulfinyl imines allyltrimethylsilane tetra-n-butylammonium fluoride.

Controlling and adjusting the concentration distribution during solidification process using static magnetic fields

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Journal of Materials Science & Technology 2020年第15期47卷 86-91页

作者： Pinfang Jiang Jiantao Wang long hou Yves Fautrelle Xi Li State Key Laboratory of Advanced Special Steels Shanghai UniversityShanghai200072PR China SIMAP-EPM-Madylam/G-INP/CNRS PHELMABP 7538402St Martin d'Heres CedexFrance

As concentration distribution changes have important effects on material structures and properties,controlling the concentration distribution is essential to alloy *** aim of the present work is to control and adjust the concentration distribution by the static magnetic *** is found that the magnetic field disperses grain boundary segregation and causes the uniform distribution of ***,by the three-dimensional computed tomography(3 D-CT) reconstruction,the flow distribution is seen and the effect mechanism of the magnetic field is *** present work may clarify the ambiguous understanding on the effect of the static magnetic field on solidification process.

关键词： Static magnetic feld Concentration distribution Structures

The Join of Split Graphs Whose Half-strong Endomorphisms Form a Monoid

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Acta Mathematica Sinica,English Series 2010年第6期26卷 1139-1148页

作者： Hai long hou Yah Feng LUO Rui GU School of Mathematics and Statistics He 'nan University of Science and Technology Luoyang 471003 P. R. China Department of Mathematics Lanzhou University Lanzhou 730000 P. R. China School of Mathematics and Statistics He 'nan University of Science and Technology Luoyang 471003 P. R. China

In this paper, the half-strong endomorphisms of the join of split graphs are investigated. We give the conditions under which the half-strong endomorphisms of the join of split graphs form a monoid.

关键词： half-strong endomorphism monoid split graph join of graphs

Microstructure and soft-magnetic properties of FeCoPCCu nanocrystalline alloys

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Journal of Materials Science & Technology 2019年第8期35卷 1655-1661页

作者： long hou Xingdu Fan Qianqian Wang Weiming Yang Baolong Shen Jiangsu Key Laboratory for Advanced Metallic Materials School of Materials Science and Engineering Southeast University Nanjing 211189 China Institute of Massive Amorphous Metal Science China University of Mining and Technology Xuzhou 221116 China

Fe(83.2-x)CoxP(10)C6Cu(0.8)(x=0,4,6,8 and 10)alloys with a high amorphous-forming ability and good softmagnetic properties were successfully *** magnetic flux density(Bs)is effectively enhanced from 1.53 T to 1.61 T for as-quenched alloy by minor Co addition,which is consistent well with the result of the linear relationship between average magnetic moment and magnetic *** Cocontained alloys,the value of corecivity(Hc)is mainly determined by magneto-crystalline anisotropy,while effective permeability(μe)is dominated by grain size and average saturation *** proper heat treatment,the Fe(79.2)Co4P(10)C6Cu(0.8)nanocrystalline alloy exhibited excellent soft-magnetic properties including a high Bsof 1.8 T,a low Hcof 6.6 A/m and a highμeof 15,510,which is closely related to the high volume fraction of α-(Fe,Co)grains and refined uniform nanocrystalline microstructure.

关键词： Anocrystalline alloy Microstructure Co addition Soft-magnetic properties Ferromagnetic exchange-coupling

Nucleation kinetics of paramagnetic and diamagnetic metal melts under a high magnetic field

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Journal of Materials Science & Technology 2021年第14期73卷 165-170页

作者： Zhipeng long Qiuyue Jiang Jiantao Wang long hou Xing Yu Yves Fautrelle Zhongming Ren Xi Li State Key Laboratory of Advanced Special Steels Shanghai UniversityShanghai200072China SIMAP-EPM-Madylam/G-INP/CNRS PHELMABP 75.38402St Martin d'Heres Cedex.France

The influence of a high magnetic field(HMF)on the nucleation kinetics of paramagnetic aluminum and diamagnetic zinc melts has been investigated by differential thermal analysis(DTA).It is found that the application of an HMF increases the undercooling of pure aluminum and pure zinc at the same heatingcooling ***,the quantitative analysis of activation energy calculated from the DTA results using the Kissinger method manifests that the HMF reduces the activation energy of pure aluminum and pure *** of magnetism,the nucleation frequency under an HMF is higher than that without an ***,the increase in undercooling under the HMF is mainly attributed to the increase of the contact angle,calculated by the functional relationship between the cooling rate and *** result is consistent with the increase of the calculated nucleation work for pure aluminum and pure ***,the increase in undercooling caused by the HMF is partly ascribed to the magnetic field-induced suppression of thermal convection in the undercooled melt.

关键词： Undercooling Activation energy Nucleation work High magnetic field

Pentavalent Symmetric Graphs of Order 16p

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Acta Mathematicae Applicatae Sinica 2017年第1期33卷 115-124页

作者： Song-tao GUO Hai-long hou Jiang-tao SHI School of Mathematics and Statistics Henan University of Science and Technology School of Mathematics and Information Science Yantai University

A graph is said to be symmetric if its automorphism group acts transitively on its arcs. In this paper, a complete classification of connected pentavalent symmetric graphs of order 16p is given for each prime p. It follows from this result that a connected pentavalent symmetric graph of order 16p exists if and only if p = 2 or 31, and that up to isomorphism, there are three such graphs.

关键词： symmetric graph s-transitive graph s-regular graph

Microstructure evolution and phase transformation of traditional cast and spray-formed hypereutectic aluminium-silicon alloys induced by heat treatment

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International Journal of Minerals,Metallurgy and Materials 2010年第3期17卷 297-306页

作者： long-gang hou Yuan-hua Cai Hua Cui Ji-shan Zhang State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

Microstructural evolution and phase transformation induced by different heat treatments of the hypereutectic aluminium-silicon alloy, Al-25Si-5Fe-3Cu （wt%, signed as 3C）, fabricated by traditional cast （TC） and spray forming （SF） processes, were investigated by differential scanning calorimetry （DSC） and scanning electron microscopy （SEM） combined with energy dispersive X-ray spectroscopy and X-ray diffraction techniques. The results show that A17Cu2Fe phase can be formed and transformed in TC- and SF-3C alloys between 802-813 K and 800-815 K, respectively. The transformation from β-Al5FeSi to δ-Al4FeSi2 phase via peritectic reaction can occur at around 858-870 K and 876-890 K in TC- and SF-3C alloys, respectively. The starting precipitation temperature of δ-Al4FeSi2 phase as the dominant Fe-bearing phase in the TC-3C alloy is 997 K and the exothermic peak about the peritectic transformation of δ-Al4FeSi2→β-Al5FeSi is not detected in the present DSC experiments. Also, the mechanisms of the microstructural evolution and phase transformation are discussed.

关键词： hypereutectic Al-Si alloy spray forming cast microstructure phase transformation

Influence of Finish Rolling Temperature on Microstructure and Mechanical Properties of a 19Cr1.5Mo0.5W Ferritic Stainless Steel

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Acta Metallurgica Sinica(English Letters) 2020年第7期33卷 991-1000页

作者： hou-long Liu Ling-Ling Liu Ming-Yu Ma Li-Qing Chen State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

A 444-type heat-resistant ferritic stainless steel containing 0.05 wt% Ce(rare earth element) and 2 wt%(Mo+W) was adopted as an experimental material to study the effect of finish rolling temperature on microstructure and texture evolution as well as on mechanical properties and *** rolling processes contain hot rolling at two different finish rolling temperatures(860℃ and 770℃) and annealing,cold rolling and subsequent *** was found that the microstructures after hot rolling and annealing could be refined by lowering finish rolling *** resultant microstructures after cold rolling and annealing were hereditarily *** finish rolling temperature can weaken α-fiber texture in hotrolled or cold-rolled ferritic stainless steel strip,while γ-fiber texture in the final product was homogeneously ***,enhanced mechanical property and formability in terms of strength and average plastic strain ratio could be obtained via decreasing finish rolling temperature.

关键词： steel Microstructure microstructure