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Effect of Al22Si/ZL102 bimetal interface fabricated by extrusion at neareutectic temperature

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Journal of Iron and Steel Research International 2017年第4期24卷 469-474页

作者： jun-feng Zhao Shan-guang Liu Xiao-guang Yuan Jian-fei Sun hong-jun huang Fu-yang Cao hong-xian Shen Yu-long Wang School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110178LiaoningChina Beijing Institute of Aeronautical Materials Beijing 100095China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangChina

The Al22Si/ZL102 bimetal was designed and prepared by extrusion at near-eutectic *** properties and fracture behaviors of different surface treatments between oxide film and zinc coating were compared between the Al22 Si and ZL102 *** average bonding strength of bimetal with intermittent oxide film interface was about 89.3MPa,which is higher than that of the bimetal fabricated by zinc coating method（about 76.3MPa）.During the process of extrusion,the oxidation film was extruded to crush and the metal was extruded through the micro-cracks of the oxidation film,then the two surfaces were joined ***,the results showed that extrusion at near-eutectic temperature is favorable for achieving a high-quality metallurgical bonded interface.

关键词： Bimetal Oxide film Interface bonding strength Zinc coating

Effect of Si addition on microstructure and mechanical properties of Al-Mg-Si-Zn alloy

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China Foundry 2020年第1期17卷 15-20页

作者： Fan-bo Meng hong-jun huang Xiao-guang Yuan Ze-wen Cui Xian-lei Hu School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China School of Materials Science and Engineering Liaoning Technology UniversityFuxin 123000China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110004China

The effect of Si addition on the microstructure and mechanical properties of Al-Mg-Si-Zn aluminum alloys were *** show that the microstructure of Al-Mg-Si-Zn alloy with low Si contents is mainly composed of Mg2Si and Mg5Si6 *** the increasing of Si content,Si and Al3.21Si0.47 phases precipitate in the form of eutectic phases in the alloys,at the same time,the mean shape factor of the second phase firstly increases and then *** analysis results show that the Si content has the main influence and the mean shape factor has the least influence on tensile *** strength increases significantly with the addition of Si,however,there is a remarkable drop in the elongation of the *** elongation is related to the formation of monotonous Al(200)structure and the enlargement of interplanar spacing of(111)and(200)crystalline planes.

关键词： Si content mean shape factor area fraction tensile strength aluminum alloy

Corrosion behavior of Cu/Al casting-rolled clad plates in different alkaline solution

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China Foundry 2021年第5期18卷 513-520页

作者： Yi-fan Zhang Xiao-guang Yuan Xiao-jiao Zuo hong-jun huang Yu-lin Cheng School of Materials Science and Engineering Shenyang University of technologyShenyang 110870China

The effect of pH value and different kinds of anions on the corrosion behavior of Cu/Al casting-rolled clad plates in the alkaline solution was evaluated by means of scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),X-ray diffraction(XRD),weight loss analysis,3D confocal laser scanning microscopy(CLSM)and electrochemical *** show the corrosion mainly occurs on the aluminum *** corrosion resistance of the Cu/Al decreases as the pH value *** pH≥12,the dissolution of the film layer is faster than the passivation *** addition of Cl^(-)ions reduces the corrosion resistance of the Cu/Al clad plates,which leads to pitting *** higher the concentration of Cl^(-)ions,the more prone the pitting to *** addition of SO_(4)^(2-)ions causes the denudation of the *** corrosion resistance of the Cu/Al is better in the alkaline solution containing NO_(3)^(-)ions than that in the solution containing Cl^(-)ions or SO_(4)^(2-)*** adding SO_(4)^(2-),NO^(3)^(-)and Cl^(-)to the pure alkaline solution,the corrosion resistance of the Cu/Al clad plates decreases.

关键词： Cu/Al clad plates alkaline solution pH anions electrochemistry casting-rolled

High-temperature oxidation behavior of a cast Ti-47.5Al-2.5V-1.0Cr-0.2Zr alloy

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China Foundry 2022年第5期19卷 443-454页

作者： Xue-jian Lin hong-jun huang Xiao-guang Yuan Yin-xiao Wang Bo-wen Zheng Xiao-jiao Zuo Ge Zhou School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

The oxidation behavior of the Ti-47.5Al-2.5V-1.0Cr-0.2Zr alloy at 900℃ was investigated at different oxidation times(5,20,60 and 100 h).The results show that the total weight gain of the alloy after 100 h at 900℃ oxidation is 9.1 g·m^(-2),and the oxidation rate decreases with oxidation *** oxides on the alloy surface are mainly TiO_(2) and Al_(2)O_(3).At the beginning of oxidation(5 h),the oxide film is relatively complete,thin,and the interface between the oxide layer and the matrix is virtually *** the end of oxidation(100 h),the thickness of the oxide film is expanded,cracking and spalling occur,and the spalling form is intra-film *** the same time,oxygen is mainly distributed in the oxide film and the oxygen content in the alloy substrate is reduced,confirming that the TiAl alloy has a certain oxidation stability at 900℃.From the outer surface of the oxide layer to the matrix,the TiO_(2) content increases and the Al_(2)O_(3) content *** proceeds to completion in this system via the dissolution and diffusion of O atom.

关键词： cast TiAl alloy high temperature oxidation oxidation film oxidation behavior

Segregation in squeeze casting 6061 aluminum alloy wheel spokes and its formation mechanism

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China Foundry 2021年第1期18卷 45-51页

作者： Fan-bo Meng hong-jun huang Xiao-guang Yuan Xue-jian Lin Ze-wen Cui Xian-lei Hu School of Materials Science and Engineering Shenyang University of TechnologyShenyang110870China School of Materials Science and Engineering Liaoning Technology UniversityFuxin123000China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110004China

Segregation can seriously damage the mechanical properties of the aluminum alloys.6061 aluminum alloy wheel spokes were prepared by squeeze *** investigate the formation mechanism of segregation,the microstructure of the alloy was observed using scanning electron microscopy,energy dispersive spectrometry,X-ray diffraction and electron microprobe analysis *** Gibbs energy of each phase during solidification was calculated by JMat *** show that the segregation phases in the R-joint of the wheel spokes are mainly composed of Mg_(2)Si,β-Al Fe Si and Al_(5)Cu_(2)Mg_(8)Si_(6)*** the solidification of the 6061 aluminum alloy wheels,Mg_(2)Si andα-Al Fe Si phases precipitate in the mushy zone at *** the decrease of temperature,α-Al Fe Si transforms intoβ-Al Fe Si,while Al_(5)Cu_(2)Mg_(8)Si_(6)precipitates from the solid-state aluminum alloy after *** at the R-joint of wheel spokes is mainly caused by insufficient cooling,so the cooling during alloy solidification should be enhanced to avoid segregation.

关键词： 6061 aluminum wheels segregation squeeze casting Mg_(2)Si Al FeSi Al_(5)Cu_(2)Mg_(8)Si_(6)

Design and application of a multichannel"cross"hot tearing tendency device:A study on hot tearing tendency of Al alloys

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China Foundry 2022年第4期19卷 327-334页

作者： Ming Su Wen-tao Zheng Deng-ke Fu hong-jun huang Xiao-jiao Zuo Chun-yu Yue Yu-xiang Wang Xiao-guang Yuan School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

Hot tearing is one of the most serious defects during the casting solidification *** this study,a new type of multichannel"cross"hot tearing device was *** hot cracks initiation and propagation were predicted by the relationship between temperature,shrinkage force and solidification time during the casting solidification *** reliability and practicability of the multichannel"cross"hot tearing device were verified by casting experiments and numerical *** theoretical calculation based on Clyne-Davies model and numerical simulation results show that the hot tearing tendency decreases in the order:2024 Al alloy>Al-Cu alloy>Al-Si alloy at a pouring temperature of 670°C and a mold temperature of 25°*** of liquid films at the end of solidification plays an important role in the propagation process of hot *** decrease of hot tearing tendency is attributed to the feeding of liquid film and intergranular bridging.

关键词： hot tearing testing device hot cracking tendency solidification process formation mechanism numerical simulation

Effect of heat treatment on microstructure,mechanical and tribological properties of in-situ (TiC+TiB)/TC4 composites by casting

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China Foundry 2023年第3期20卷 207-217页

作者： Bo-wen Zheng Shuai Chen Chun-yu Yue Xue-jian Lin Fu-yu Dong hong-jun huang Xiao-jiao Zuo Yin-xiao Wang Xiao-guang Yuan School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

To enhance the performance of in-situ synthesized 6vol.%(Ti C+Ti B)/TC4 titanium matrix composites fabricated by casting,a variety of heat treatment processes were carried *** conducting microstructure observations following various heat treatments,it was found that the composites exhibit a basketweave microstructure,consisting of an α phase and a transformed β *** sizes of(α+β) phases were found to be refined to varying degrees after the heat treatment processes,while the morphology of Ti B remains largely unchanged and Ti C becomes *** testing revealed that all composites subjected to different heat treatments demonstrate a notable increase in ultimate compressive strength as well as a slight improvement in plasticity compared to the as-cast *** results of the tribological performance test indicated that the heat-treated composites exhibit lower average friction coefficient,specific wear rate,and worn surface roughness compared to the as-cast *** the heat treatment processes studied,the composite solution heated at 1,150 °C/1 h followed by air cooling,then 950 °C/1 h followed by air cooling,and finally 500 °C/4 h followed by air cooling,demonstrates the highest levels of hardness,compressive strength,and wear *** improvements are attributed to the combined effects of solid solution strengthening,grain refinement,and the pinning of dislocation slip.

关键词： titanium matrix composites heat treatment mechanical properties tribological properties

Hydrogen-induced amorphization of Zr-Cu-Ni-Al alloy

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China Foundry 2017年第2期14卷 145-150页

作者： Fu-yu Dong Song-song Lu Yue Zhang Qing-chun Xiang hong-jun huang Xiao-guang Yuan Xiao-jiao Zuo Liang-shun Luo Yan-qing Su Bin-bin Wang School of Materials Science and Engineering Shenyang University of Technology School of Materials Science and Engineering Harbin Institute of Technology

Arc melting was utilized in this study to produce Zr_(55)Cu_(30)Ni_5Al_(10) alloys under mixed atmospheres with various ratios of high-purity hydrogen to argon. The influences of hydrogen addition on the solidification structure and glass-forming ability of Zr_(55)Cu_(30)Ni_5Al_(10) alloy were determined by examining microstructures in different parts of the cast ingots. The results showed that different degrees of crystallization structures were obtained in the ascast button ingots after arc melting in high-purity Ar, and the cross-sectional solidification morphology of arcmelted ingots was found to consist of crystals with varying from the bottom up. By contrast, there were completely amorphous structures in the middle and upper areas of the as-cast button ingots fabricated by adding 10% H_2 to the high-purity Ar atmosphere. A clear solidification interface was found between the crystal and glass in the ascast button ingots, which indicates that hydrogen addition can enhance the Zr_(55)Cu_(30)Ni_5Al_(10) alloy's glass-forming ability. The precise mechanism responsible for this was also investigated.

关键词： Zr-Cu-Ni-Al alloy melt hydrogenation solidification structure hydrogen-induced amorphization

Cell proliferation in the endolymphatic sac in situ during the immune response of inner ear

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Journal of Otology 2006年第2期1卷 124-127页

作者： XIAO hong-jun, huang Xiao-wen, WANG Ji-bao, huang Xiang Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science & Technology, Wuhan 430030, People’s Republic China Department of Otorhinolaryngology Union Hospital Tongji Medical College Huazhong University of Science & Technology Wuhan 430030 People’s Republic China

Background Normally, few immunocompetent cell are present in the endolymphatic sac (ES). During an active immune response in the inner ear, large amount of inflammatory cells, including immunocompetent cells, are seen in the ES. The current study aimed at assessing cellular proliferation within the ES during induced immune response in the inner ear. Methods Fifteen healthy, female SD rats were sensitized systemically with keyhole limpet hemocyanin (KLH), followed by local inoculation in the cochlea through basal turn fenestration with the same antigen. On Days 3, 7 and 14 following inoculation, the animal was sacrificed after intraperitoneal administration of 5-bromo-2’-deoxyuridine (BrdUrd), and the temporal bone harvested. Following decalcification, infiltration by BrdUrd- and IgG-positive cells in the ES was studied on frozen sections with H & E and immunohistochemical staining. Results During the secondary immune response in the inner ear against T-dependent antigens, there is increased cellular proliferation in the ES. The proliferated cells may differentiate into immunocompetent cells at the same location. Conclusions These findings indicate that the ES plays an important role in immune response of inner ear.

关键词： Endolymphatic sac Cell proliferation Immune response