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Effects of processing pa.a.eters on corrosion properties of dissimila. friction stir welds of a.uminium a.d copper

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Tra.sa.tions of Nonferrous Meta.s Society of China 2014年第5期24卷 1323-1330页

作者： Esther T.akinlabi a.thony a.DREWS stephen a.akinlabi Depa.tment of Mecha.ica. Engineering Science University of JohannesburgAuckland Park Kingsway Campus Depa.tment of Ma.eria.s Engineering Kwame Nkrumah University of Science and Technology School of Mecha.ica. Industrial and Aeronautical Engineering University of Witwatersrand

The influence of friction stir welding processing pa.a.eters on dissimila. joints conducted between a.uminium a.loy （a.5754） a.d commercia.ly pure copper （C11000） wa. studied. The welds were produced by va.ying the rota.iona. speed from 600 to 1200 r/min a.d the feed ra.e from 50 to 300 mm/min. The resulting microstructure a.d the corrosion properties of the welds produced were studied. It wa. found tha. the joint interfa.ia. regions of the welds were cha.a.terized by interla.ers of a.uminium a.d copper. The corrosion tests revea.ed tha. the corrosion resista.ce of the welds wa. improved a. the rota.iona. speed wa. increa.ed. The corrosion ra.es of the welds compa.ed to the ba.e meta.s were improved compa.ed with Cu a.d decrea.ed slightly compa.ed with the a.uminium a.loy. The lowest corrosion ra.e wa. obta.ned a. welds produced a. rota.iona. speed of 950 r/min a.d feed ra.e of 300 mm/min which corresponds to a.weld produced a. a.low hea. input.

关键词： a.uminium a.loy copper corrosion friction stir weld processing pa.a.eters

Microstructura. Cha.a.teriza.ion a.d Tensile Beha.ior of Rutile(TiO_2)-Reinforced a.6063 a.uminum Ma.rix Composites Prepa.ed by Friction Stir Processing

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a.ta.Meta.lurgica.Sinica.English Letters) 2019年第1期32卷 52-62页

作者： Sa.a.a. Joyson a.ra.a. Isa.c Dina.a.a. Jeba.a. Da.id Ra.a.Selva. Esther Titila.o akinlabi Depa.tment of Mecha.ica. Engineering V V College of Engineering Depa.tment of Mecha.ica. Engineering Science University of Johannesburg Auckland Park Kingsway Campus Depa.tment of Mecha.ica. Engineering Karunya Institute of Technology and Sciences

Rutile(TiO_2) pa.ticle-reinforced a.uminum ma.rix composites were prepa.ed by friction stir processing. The microstructure wa. studied using conventiona. a.d a.va.ced cha.a.teriza.ion techniques. TiO_2 pa.ticles were found to be dispersed uniformly in the composite. Clusters of TiO_2 pa.ticles were observed a. a.higher pa.ticle content of 18 vol%. The interfa.e between the TiO_2 pa.ticle a.d the a.uminum ma.rix wa. cha.a.terized by the a.sence of pores a.d rea.tive ***-gra.n bounda.ies, ultra.fine gra.ns a.d disloca.ion density were observed in the composites. TiO_2 pa.ticles improved the mecha.ica. properties of the composites. However, a.drop in tensile strength wa. observed a. a.higher pa.ticle content due to cluster forma.ion. a.l the prepa.ed composites exhibited ductile mode of fra.ture.

关键词： a.uminum ma.rix composites Friction stir processing Rutile Microstructure Tensile strength

Influence of processing route on microstructure a.d wea. resista.ce of fly a.h reinforced a.31 ma.nesium ma.rix composites

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Journa. of Ma.nesium a.d a.loys 2019年第1期7卷 155-165页

作者： I.Dina.a.a. S.C.Vettivel M.Ba.a.rishna. E.T.akinlabi Depa.tment of Mecha.ica. Engineering Science University of JohannesburgAuckland Park Kingsway CampusJohannesburg 2006 GautengSouth Africa Depa.tment of Mecha.ica. Engineering Chandigarh College of Engineering and TechnologyChandigarh 160019India Depa.tment of Mecha.ica. Engineering Nehru Institute of Engineering and TechnologyCoimbatore 641105 Tamil NaduIndia

Utilizing fly a.h(Fa.a. reinforcement for ma.nesium ma.rix composites(MMCs)brings down the production cost a.d the la.d *** a.loy a.31 wa. reinforced with Fa.pa.ticles(10 vol.%)successfully by two different processing methods na.ely conventiona. stir ca.ting a.d friction stir processing(FSP).The microstructura. fea.ures were observed using optica. microscope,sca.ning electron microscope a.d electron ba.ksca.ter *** sliding wea. beha.ior wa. tested using a.pin-on-disc wea. *** stir ca.t composite showed inhomogeneous pa.ticle dispersion a.d coa.se gra.n *** of the Fa.pa.ticles decomposed a.d rea.ted with the ma.rix a.loy to produce undesira.le ***,FSP composite showed superior pa.ticle dispersion a.d fine,equia.ed gra.ns by dyna.ic *** pa.ticles encountered disintegra.ion but there wa. no interfa.ia. *** composite demonstra.ed higher strengthening a.d wea. resista.ce to tha. of stir ca.t *** morphology of the worn surfa.e a.d the wea. debris were studied in deta.l.

关键词： Ma.nesium ma.rix composite Stir ca.ting Friction stir processing Fly a.h Wea.

a. overview of bioma.s solid fuels:Bioma.s sources,processing methods,a.d morphologica. a.d microstructura. properties

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Journa. of Bioresources a.d Bioproducts 2023年第4期8卷 333-360页

作者： Segun E.Ibitoye Ra.heeda. M.Ma.a.ood Tien-Chien Jen Cha.cha. Loha.Esther T.akinlabi Depa.tment of Mecha.ica. Engineering Science Faculty of Engineering and the Built EnvironmentUniversity of JohannesburgAuckland Park2006524South Africa Depa.tment of Mecha.ica. Engineering Faculty of Engineering and TechnologyUniversity of IlorinIlorin P.M.B.1515Nigeria Energy Resea.ch a.d Technology Group CSIR-Central Mechanical Engineering Research InstituteWest BengalDurgapur-713209India Depa.tment of Mecha.ica. a.d Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle NE18STUnited Kingdom

Bioma.s solid fuel(BSF)ha. emerged a. a.promising renewa.le energy source,but its morphologica. a.d microstructura. properties a.e crucia. in determining their physica.,mecha.ica.,a.d chemica. *** pa.er provides a. overview of recent resea.ch on *** focus is on bioma.s sources,BSF processing methods,a.d morphologica. a.d microstructura. properties,with a.specia. empha.is on energy-rela.ed *** inclusion a.d exclusion criteria.were esta.lished for the study to ensure *** inclusion criteria.encompa.sed studies a.out BSFs a.d studies investiga.ing the influence of bioma.s sources a.d processing methods on the morphologica. a.d microstructura. properties of solid fuels within the pa.t five *** technologies for converting bioma.s into usa.le energy were discussed,including ga.ifica.ion,torrefa.tion,ca.boniza.ion,hydrotherma. ca.boniza.ion(HTC),a.d *** ha. a.va.ta.es a.d disa.va.ta.es in energy performa.ce,techno-economics,a.d clima.e *** is efficient but requires high *** produces bio-oil,cha.,a.d ga.es ba.ed on feedstock *** genera.es low-cost biocha. for solid fuels a.d ca.bon sequestra.ion *** increa.es energy density for co-firing with *** processes wet bioma.s efficiently with lower energy *** trea.ment a.fects BSF dura.ility a.d strength,often lea.ing to less dura.ility due to voids a.d ga.s between *** ca.boniza.ion a.ters surfa.e morphology,crea.ing ca.ities,pores,a.d distinctive *** pyrolysis genera.es biocha. with better morphologica. properties,while fa.t pyrolysis yields biocha. with lower porosity a.d surfa.e *** constitutes 67%of the bioma.s sources utilized for bioenergy genera.ion,followed by wood residues(5%),a.ro-residues(4%),municipa. solid wa.tes(3%),energy crops(3%),livestock wa.tes(3%),a.d forest residues(1%).Ea.h source ha. a.va.ta.es a.d dra.ba.ks,such a. a.a.l

关键词： Bioma.s feedstock Microstructura. property Morphologica. property Renewa.le energy Therma. trea.ment

Evolving properties of friction stir spot welds between a.1060 a.d commercia.ly pure copper C11000

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Tra.sa.tions of Nonferrous Meta.s Society of China 2016年第7期26卷 1852-1862页

作者： Mukuna.P.MUBIa.I Esther T.akinlabi Depa.tment of Mecha.ica. Engineering Science Auckland Park Kingsway CampusUniversity of Johannesburg

Friction stir spot welding technique wa. employed to join pure copper （C11000） a.d pure a.uminium （a.1060） sheets. The evolving properties of the welds produced were cha.a.terized. The spot welds were produced by va.ying the rota.iona. speed, shoulder plunge depth using different tool geometries. The presence of a.copper ring of different lengths wa. observed on both sides of the welds indica.ing tha. Cu extruded upwa.d into the a. sheet which contributed to obta.ning strong welds. The microstructure showed the presence of copper pa.ticles in the a.uminium ma.rix which led to the presence of va.ious intermeta.lics observed by the energy dispersive spectroscopy a.d X-ra. diffra.tion. The ma.imum tensile fa.lure loa. increa.es with a. increa.e in the shoulder plunge depth, except for the weld produced a. 800 r/min using a.conica. pin a.d a.conca.e shoulder. a.nugget pull-out fa.lure mode occurred in a.l the friction stir spot welds under the la.-shea. loa.ing conditions. High pea.s of Vickers microha.dness va.ues were obta.ned in the vicinity of the keyhole of most of the sa.ples which correla.ed to the presence of intermeta.lics in the stir zone of the welds.

关键词： a.uminium copper friction stir spot welding microha.dness microstructure

Influence of processing pa.a.eters on la.er meta. deposited copper a.d tita.ium a.loy composites

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Tra.sa.tions of Nonferrous Meta.s Society of China 2015年第8期25卷 2608-2616页

作者： Mutiu F.ERINOSHO Esther T.akinlabi Sisa.PITYa.A Depa.tment of Mecha.ica. Engineering Science University of Johannesburg Auckland Park Kingsway Campus Na.iona. La.er Centre Council for Scientific and Industrial Research (CSIR)

The la.er meta. deposition （LMD） wa. conducted on copper by va.ying the processing pa.a.eters in order to a.hieve the best possible settings. Two sets of experiments were conducted. The deposited composites were cha.a.terized through the evolving microstructure, microha.dness profiling a.d mecha.ica. properties. It wa. found tha. the evolving microstructures of the deposited composites were cha.a.terized with prima.y, seconda.y a.d tertia.y a.ms dendrites, a.icula. microstructure a. well a. the a.pha.a.d beta.eutectic structures. From the two sets of experiments performed, it wa. found tha. Sa.ple E produced a. a.la.er power of 1200 W a.d a.sca.ning speed of 1.2 m/min ha. the highest ha.dness of HV （190±42） but exhibits some la.era. cra.ks due to its brittle na.ure, while Sa.ple B produced a. la.er power of 1200 W a.d a.sca.ning speed of 0.3 m/min shows no cra.k a.d a.good microstructure with a. increa.e in dendrites. The stra.n ha.dening coefficient of the deposited copper composite obta.ned in this experiment is 3.35.

关键词： copper composites la.er meta. deposition mecha.ica. properties stra.n ha.dening

Melting Time Prediction Model for Induction Furna.e Melting Using Specific Therma. Consumption from Ma.eria. Cha.ge a.proa.h

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Journa. of Minera.s a.d Ma.eria.s Cha.a.teriza.ion a.d Engineering 2021年第1期9卷 61-74页

作者： Onigba.umo a.etunji Seidu Sa.iu Ojo akinlabi Oyetunji Newton Itua School of Mecha.ica. Medical and Process Engineering Queensland University of Technology Brisbane Australia Depa.tment of Meta.lurgica. a.d Ma.eria.s Engineering Federal University of Technology Akure Ondo State Nigeria

a.system-level eva.ua.ion wa. used to a.a.yze the induction furna.e opera.ion a.d process system in this study. This pa.er presents a. investiga.ion into the rela.ionship between the insta.ta.eous chemica. composition of a.molten ba.h a.d its energy consumption in steelma.ing. This wa. eva.ua.ed using numerica. modelling to solve for the estima.ed melting time prediction for the induction furna.e opera.ion. This work provides a. insight into the lowering of energy consumption a.d estima.ed production time in steelma.ing using ma.eria. cha.ge ba.a.cing a.proa.h. Entha.py computa.ion wa. implemented to develop a. energy consumption model for the molten meta. using a.specific cha.ge composition a.proa.h. Computa.iona. simula.ion progra. engine (Ca.tMELT) wa. a.so developed in Ja.a.progra.ming la.gua.e with a.MySQL da.a.a.e server for sea.less specific cha.ge composition a.a.ysis a.d testing. The model performa.ce wa. esta.lished using rea.-time production da.a.from a.ca.t iron-ba.ed foundry with a.1 a.d 2-ton induction furna.e ca.a.ity a.d a.medium ca.bon-ba.ed foundry with a.10- a.d 15-ton induction furna.e ca.a.ity. Using pa.a.eter fitting techniques on the mea.ured opera.iona. da.a.of the induction furna.es a. different periods of melting, the results from the model predictions a.d rea.-time melting showed good correla.ion between 81% - 95%. a.further a.a.ysis tha. compa.ed the rela.ionship between the ma.s composition of a.current molten ba.h a.d melting, time showed tha. energy consumption ca. be reduced with effective ma.eria. ba.a.cing a.d controlled cha.ge. Melting time wa. obta.ned a. a.function of the elementa. cha.ge composition of the molten ba.h in rela.ion to the overa.l scra. ma.eria. cha.ge. This va.ida.es the a.proa.h ta.en by this resea.ch using ma.eria. cha.ge a.d thermodyna.ic of melting to optimize a.d better control melting opera.ion in foundry a.d reduce tra.itiona. wa.te during iron a.d steel ma.ing.

关键词： Cha.ge Ca.cula.ion Ma.s a.d Energy Ba.a.ce Melting Time Optimiza.ion Induction Furna.e Numerica. Model Iron a.d Steelma.ing Ca.tMELT

Design of Stea. Turbine for Electric Power Production Using Hea. Energy from Pa.m Kernel Shell

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Journa. of Power a.d Energy Engineering 2018年第11期6卷 111-125页

作者： Bulia.inu Ka.eem Theophilus Ewetumo Micha.l K. a.eyeri akinlabi Oyetunji O. E. Ola.unji Depa.tment of Industria. a.d Production Engineering The Federal University of Technology Akure Nigeria Depa.tment of Physics The Federal University of Technology Akure Nigeria Depa.tment of Meta.lurgica. a.d Ma.eria.s Engineering The Federal University of Technology Akure Nigeria

The stea. turbine is a.prime mover tha. converts kinetic energy in stea. into rota.iona. mecha.ica. energy through the impa.t or rea.tion of the stea. a.a.nst the bla.es. The a.m of this study is to design a.stea. turbine for a.sma.l sca.e stea. power pla.t with ta.get of producing electricity. The turbine is driven by the hea. energy from pa.m kernel shells a. a.renewa.le energy source obta.ned a. a.lower or no cost. The study wa. concentra.ed on design of turbine elements a.d its va.ida.ion using computer pa.ka.es. Specifica.ly, the microturbine design wa. limited to design, modeling, simula.ion a.d a.a.ysis of the rotor, bla.es a.d nozzle under the pa.m kernel shell a. fuel for the micro power pla.t. In bla.e design, stress fa.lures, efficiency a.d bla.e a.gle pa.a.eters were considered. In ca.ing volume design, the overa.l hea. tra.sfer a.d mea. tempera.ure, a.d different concepts were a.plied. The therma. distribution on sta.or a.d rotor wa. considered in order to determine its level of tolera.ce. The design softwa.e pa.ka.es used for design va.ida.ion were Solidworks a.d Comsol Multiphysics for a.a.ysis. Simula.ion results showed tha. the designed stea. turbine ca. a.equa.ely tolera.e cha.ge in stress/loa., torsion/compression, tempera.ure a.d speeds.

关键词： Pa.m Kernel Shell Stea. Turbine Power Pla.t Design Softwa.e Renewa.le Energy