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Magnesium matrix composite reinforced by nanoparticles-A review

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journal of Magnesium and Alloys 2021年第1期9卷 57-77页

作者： K.B.Nie x.j.wang K.K.Deng x.S.Hu K.Wu State Key Laboratory of Advanced Welding and joining Harbin Institute of TechnologyHarbin 150001China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China

Significant progress has been made in magnesium-based composites during recent decades,especially for the appearance of magnesium matrix composite reinforced by *** nanoparticles added not only exhibit a good strengthening effect,but also maintain the initial toughness of the matrix,effectively balancing the contradiction between the strength and plasticity in the traditional magnesium matrix *** magnesium matrix nanocomposites with excellent mechanical properties have pushed the development of magnesium matrix composites to a new ***,it is very difficult to disperse the nanoparticles in metal melt especially in magnesium melt which is different from other metal melts and dangerous during the cast *** means that the preparation of magnesium matrix nanocomposite is extremely ***,the magnesium matrix nanocomposites possess a distinctive characteristic in deformation behavior,strengthening and toughening mechanism due to their special size effect of ***,this review will focus on the new preparation technologies,deformation behavior,mechanical properties and strengthening and toughening *** potential applications,development trends and future research ideas of magnesium matrix nanocomposite are also prospected.©2020 Published by Elsevier *** behalf of Chongqing University.

关键词： Magnesium matrix nanocomposite Microstructure Mechanical properties Strengthening mechanism

Effect of environments and normal loads on tribological properties of nitrided Ni(45)(FeCoCr)(40)(AlTi)(15)high-entropy alloys

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journal of Materials Science & Technology 2020年第7期42卷 85-96页

作者： L.W.Lan x.j.wang R.P.Guo H.j.Yang j.W.Qiao Research Center for High-Entropy Alloys College of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuan030024China

The tribological properties of nitrided Ni(45)(FeCoCr)(40)(AlTi)(15)high-entropy alloys(HEAs)were investigated in air and simulated acid rain under different normal loads(5,7,10,and 12 N)at ambient *** results revealed that as-cast HEAs were only composed of FCC phase,while the volume fraction of FCC phase in the nitrided alloys was significantly ***,the hard phases of AIN,CrN,Fe4 N,and TiN phases were formed in the nitrided *** thickness of the nitriding layer was about 8.4μ*** hardness increased from 8.7 GPa in as-cast alloys to 14.5 GPa in the nitrided *** addition,under the same conditions,the friction coefficient of the nitrided alloys was higher than that of as-cast alloys,but the wear rate was generally lower than that of as-cast ***,the wear rate of the nitrided alloys was the lowest in acid rain due to the lubrication,cleaning,and cooling in the liquid *** air,dominating wear mechanisms in as-cast and nitrided alloys were abrasive,delamination,and adhesive ***,the wear mechanism of as-cast and nitrided alloys in acid rain was mainly abrasive and corrosion wears.

关键词： Abrasive wear Hardness Corrosive wear Microstructure Wear mechanism

SUBSTRATE MATERIALS FOR POLY-CSiTF SOLAR CELLS: OPTIMIZATION OF SILICON SHEET FROM POWDER

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Acta Metallurgica Sinica(English Letters) 2005年第3期18卷 184-188页

作者： Q.Ban H.Shen x.j.wang x.W.Zou Z.C.Liang StateKeyLaboratoryofOptoelectronicMaterialsandTechnologies DepartmentofPhysicsandEngineeringZhongshan（SunYat-sen）UniversityGuangzhou510275China GuangzhouInstituteofEnergyConversion TheChineseAcademyofSciencesGuangzhou510275China

The optimization of silicon sheet from powder (SSP) technology as polycrystalli ne silicon thin film (poly-CSiTF) solar cells' substrate materials is studied by orthogonal design experimental method. Based on technological optimization of S SP prepared from electronic grade silicon powder, SSP solar cell devices with si mple structure are prepared and the effect of SSP substrate is discussed. Up to now, the conversion efficiency of the prepared solar cells on low purity SSP sub strate with fundamental structure has reached 8.25% (with area of 1cm×1cm).

关键词： poly-CSiTF SSP substrate material

Effects of Organic and Chemical Fertilizations and Microbe Inoculation on Physiology and Growth of Sweet Corn Plants

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Pedosphere 2000年第3期10卷 229-236页

作者： x.j.wang H.L.xu j.H.wang H.UMEMURA Center for Environmental Science in Saitama 914 KamitanadareKisaimachiSaitama 347－0115Japan International Nature Farming Research Center Hata 5632Nagano 390－1401Japan

A pot culture experiment was carried out in a glasshouse to compare the physiology and growth of sweet corn plants (Zea mays L. cv. Honey Bantam) grown under organic and chemical fertilizations with or without microbial inoculation (MI). The organic fertilizer used was fermented mainly using rice bran and oil mill sludge, and the MI was a liquid product containing many beneficial microbes such as lactic acid bacteria, yeast, photosynthetic bacteria and actinomycetes. The application amounts of the organic fertilizer and chemical fertilizers were based on the same rate of nitrogen, phosphorus and potassium. Sweet corn plants fertilized with organic materials inoculated with beneficial microbes grew better than those without inoculation. There were no significant differences in physiology and growth of the sweet corn plants between treatments of chemical fertilizers with and without MI. Among the organic fertilization treatments, only the sweet corn plants with organic fertilizer and MI applied 4 weeks before sowing had similar photosynthetic capacityj total dry matter yield and ear yield to those with chemical fertilizers. Sweet corn plants in other organic fertilization treatments were weaker in physiology and growth than those in chemical fertilization treatments. There was no significant variance among chemical fertilization treatments at different time. It is concluded from this research that this organic fertilizer would be more effective if it was inoculated with the beneficial microbes. Early application of the organic fertilizer with beneficial microbes before sowing was recommended to make the nutrients available before the rapid growth at the early stage and obtain a yield similar to or higher than that with chemical fertilizations.

关键词： beneficial microbes fertilization time organic farming Zea mays L

A Novel Melt Processing for Mg Matrix Composites Reinforced by Multiwalled Carbon Nanotubes

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journal of Materials Science & Technology 2016年第12期32卷 1303-1308页

作者： H.L.Shi x.j.wang C.L.Zhang C.D.Li C.Ding K.Wu x.S.Hu School of Materials Science and Engineering Harbin Institute of Technology

Carbon nanotubes（CNTs） reinforced Mg matrix composites were fabricated by a novel melt *** novel processing consisted of two courses：CNTs pre-dispersion and ultrasonic melt *** ball-milling was employed to pre-disperse CNTs on Zinc（Zn） *** CNT entanglements were well dispersed to single CNT or tiny clusters on Zn *** ultrasonic melt processing further dispersed CNTs in the Mg melt,especially tiny CNT ***,a uniform dispersion of CNTs was achieved in the as-cast *** extrusion further improved the distribution of *** increased both the strength and elongation of the matrix ***,the elongation of the matrix alloy was enhanced by 40%.Grain refinement and the pulling-out of CNTs resulted in the evident improvement of ductility for the composites.

关键词： Pre-dispersion Carbon nanotubes Magnesium matrix composites Ultrasonic

Bulk nanocrystalline W-Ti alloys with exceptional mechanical properties and thermal stability

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journal of Materials Science & Technology 2022年第19期114卷 16-28页

作者： H.x.xue x.C.Cai B.R.Sun x.Shen C.C.Du x.j.wang T.T.Yang S.W.xin T.D.Shen Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China CSSC 723rd Research Institute China State Shipbuilding Corporation LimitedYangzhou 225000China

Nanocrystalline(NC)W metals and alloys often exhibit higher radiation tolerance and strength than their coarse-grained ***,their thermal stability is low,making it difficult to achieve bulk NC W metals and alloys by consolidation using conventional techniques such as pressure-less sintering,hot-explosive-compaction sintering,and spark plasma *** we report the synthesis and mechanical properties of bulk NC W_(100-x)Ti_(x)(x=10 at.%-30 at.%)alloys prepared by consolidating mechanically alloyed NC powders under a high-temperature/high-pressure *** 20 at.%-30 at.%Ti largely improves the sinterability of NC W-Ti alloy *** room-temperature microhardness and compressive yield strength of consolidated bulk NC W_(80)Ti_(20) alloy are∼16.9 and 6.0 GPa,respectively,which are mainly caused by grain boundary strengthening and significantly higher than those of previously reported W and W *** ultimate compressive strength of bulk NC W_(80)Ti_(20) measured between 900 and 1100°C deceases with increasing *** behavior can be explained by the activation of Rachinger grain boundary *** grain growth is observed in bulk NC W_(80)Ti_(20) after compression at 1000°*** calculation suggests that it is the segregation of Ti at grain boundaries that decreases the specific grain boundary free energy and makes the NC W_(80)Ti_(20) alloy thermodynamically stable.

关键词： Nanocrystalline W-Ti alloys Segregation Grain boundary energy Strength Hardness

Effect of forced-air cooling on the microstructure and age-hardening response of extruded Mg-Gd-Y-Zn-Zr alloy full with LPSO lamella

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journal of Materials Science & Technology 2021年第14期73卷 66-75页

作者： S.Z.Wu T.Nakata G.Z.Tang C.xu x.j.wang x.W.Li x.G.Qiao M.Y.Zheng L.Geng S.Kamado G.H.Fan School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Research Center for Advanced Magnesium Technology Nagaoka University of TechnologyNagaoka 940-2188Japan School of Material Science and Engineering Harbin University of Science and TechnologyHarbin 150040China Key Laboratory for Light-weight Materials Nanjing Tech UniversityNanjing 211816China

The homogenized Mg-8.2 Gd-3.8 Y-1.0 Zn-0.4 Zr(wt.%)alloy full of plate-shaped long period stacking ordered(LPSO)phases was hot extruded in the atmosphere and cooled by the forced-air,then the effect of forced-air cooling on the microstructure and age-hardening response of the alloy was investigated in this *** results show that in comparison with the extruded sample cooling in the atmosphere,the forced-air cooling restricts dynamic recrystallization(DRx)and brings about finer dynamic recrystallized(DRxed)grain size,stronger basal texture and higher dislocation ***,the forced-air cooling promotes the dynamic precipitation in the DRxed regions and facilitates formation of plate-shaped LPSO phases andγ’phases with smaller interspacing in the unrecrystallized(un DRxed)regions,then slightly restricts the precipitation ofβphases during *** peak-ageing treatment,the extruded sample with forced-air cooling shows superior tensile properties with a tensile yield strength of 439 MPa,an ultimate tensile strength of 493 MPa,and elongation to failure of 18.6%.

关键词： Mg-RE alloy LPSO phase Dynamic recrystallization Precipitation Mechanical properties

Microstructure and room temperature tensile properties of 1μm-SiCp/AZ31B magnesium matrix composite

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journal of Magnesium and Alloys 2015年第2期3卷 155-161页

作者： M.j.Shen x.j.wang M.F.Zhang B.H.Zhang M.Y.Zheng K.Wu College of Engineering Shenyang Agricultural UniversityShenyang 110866PR China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001PR China Liaoning Provincial Gem Quality Supervision and Inspection Center Shenyang 110000PR China

In the present study,AZ31B magnesium matrix composites reinforced with two volume fractions(3 and 5 vol.%)of micron-SiC particles(1μm)were fabricated by semisolid stirring assisted ultrasonic vibration *** as-cast ingots were extruded at 350℃ with the extrusion ratio of 15:1 at a constant ram speed of 15 mm/*** microstructure of the composites was investigated by optical microscopy,scanning electron microscope and transmission electron *** characterization of the composites showed relative uniform reinforcement distribution and significant grain *** presence of 1μm-SiC particles assisted in improving the elastic modulus and tensile *** ultimate tensile strength and yield strength of the 5 vol.%SiCp/AZ31B composites were simultaneously improved.

关键词： Magnesium matrix composite Microstructure Mechanical properties

International Conference on Liquid Crystal Polymers

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Chinese journal of Polymer Science 1995年第1期13卷 97-97页

作者： Q.F.Zhou x.j.wang

Under the sponsorship of the International Union of Pure and Applied Chemistry (IUPAC)and Chinese Chemical Society, the International Conference on Liquid Crystal Polymers was heldat the Twenty-First Century Hotel, Beijing China, in 6-9 September 1994. The conference Chair-man and Secretary general were Professors Q. F. Zhou of Peking University and x. j. wang of

关键词： IUPAC