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c.r.osion Behavior.of c.nospher. r.infor.0}d Al7075 Metal Matr.x c.mposite r.>—An Exper.mental Appr.ac.

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Jour.al of Miner.ls and Mater.als c.ar.c.er.zation and Engineer.ng 2018年第3期6卷 424-437页

作者： r.vi Kumar.D. V. Seenappa c. r. prakash rao V. Bhar.t Depar.ment of Mec.anic.l Engineer.ng Global Academy of Technology Bengaluru India Depar.ment of Mec.anic.l Engineer.ng Government Engineering College Ramanagara India

Aluminum-based metal matr.x c.mposites (MMc.) ar. c.nsider.d in sever.l tec.nologic.l applic.tions owing to their.enhanc.d mec.anic.l pr.per.ies when c.mpar.d with monolithic.metals. r.sear.0} on the mec.anic.l pr.per.ies MMc. was done by many r.sear.0}er.;however.in depth study on the oxidation behavior.of c.nospher., r.infor.0}d MMc. ar. r.quir.d, sinc. the applic.tion of Aluminum-based MMc. is extensively used in applic.tions like automobile, navigation and aviation, wher. the demand on light weight c.r.osion r.sistanc. mater.al is ver. muc. r.quir.d. In the pr.sent wor. var.ed c.mpositions of Al7075 gr.de Aluminum-c.nospher. c.mposites use liquid metallur.y r.ute adopting stir.c.sting appr.ac.. The exper.mental study was aimed at exper.mental investigations of developed c.mposites under.differ.nt c.r.osive envir.nments. The c.r.osion tests wer. c.r.ied out as per.ASTM standar.s. Salt spr.y test using Nac. was c.r.ied out as per.ASTM B117 and immer.ion tests using Nac. and NaOH as c.r.odents wer. c.r.ied out by following ASTM G31 standar.s. The r.sults obtained fr.m the tests r.vealed that as inc.ease in weight % of r.infor.0}ment, c.r.osion r.sistanc. inc.eases up to 7.5% r.infor.0}ment, and fur.her.the c.r.osion r.sistanc. dec.eases mar.inally. Solution heat tr.ated samples exhibited higher.r.sistanc. to oxidation than c.st samples in all c.r.osive envir.nments. The SEM images show the pr.senc. of mic.o c.ac.s and oc.ur.enc. of pitting c.r.osion on the c.r.osion tested spec.mens.

关键词： Al7075 c.nospher. Metal Matr.x c.mposites Nac. NaOH Salt Spr.y Test c.r.osion Wear

Optimization of Wear.Fac.or. of Aluminium Hybr.d Metal Matr.x c.mposites Using Taguc.i Method

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Jour.al of Miner.ls and Mater.als c.ar.c.er.zation and Engineer.ng 2021年第1期9卷 38-47页

作者： P. B. Asha Sneha Sar.ka Mur.hy c. r. prakash rao V. r.vi Kumar.r. Kir.n c. N. Sur.sha Depar.ment of Mec.anic.l Engineer.ng Global Academy of Technology Bengaluru India Depar.ment of Mec.anic.l Engineer.ng Amruta Institute of Engineering & Management Sciences Bengaluru India

Hybr.d metal matr.x c.mposites (Hmmc. ar. found to be mor. super.or.than the c.nventional c.mposite mater.als bec.use of their.impr.ved mec.anic.l pr.per.ies, whic. c.n be suited for.an extensive r.nge of engineer.ng applic.tions. Automobile and aer.spac. industr.es widely make use of hybr.d c.mposites as they possess exc.llent c.r.osion, wear.r.sistanc., low density, and high str.ngth. This paper.displays the str.tegy to build the hybr.d c.mposite utilizing Stir.c.sting Method. Pr.sent investigation inc.udes the c.eation of c.mposites utilizing bor.n c.r.ide (2%, 4%, 6% volume) and r.d mud (2% volume) as the r.infor.0}ments and Str.c.ur.l aluminium as the matr.x. Exper.mental investigation of wear.analysis of the c.mposites was c.r.ied out ac.or.ing to the L9 Taguc.i method. The designated number.of exper.ments was ac.omplished to pr.be the impac. of c.ntr.l fac.or. on the spec.fic.wear.r.te (SWr. of the developed c.mposites. ANOVA was c.r.ied out and Wt%. r.infor.0}ment was found to be the dec.sive fac.or.on the SWr.of the developed hybr.d c.mposite. The c.nfir.ator. test was suc.essfully c.r.ied out and the c.mputed er.or.was found to be var.ing fr.m 0.878% to 2.58%.

关键词： Taguc.i ANNOVA Wear Signal-to-Noise r.tio Hybr.d Metal Matr.x c.mposite

Fabr.c.tion, c.ar.c.er.zation and Mac.ining of Al6061 r.infor.0}d with r.d Mud c.mposite

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Jour.al of Miner.ls and Mater.als c.ar.c.er.zation and Engineer.ng 2022年第1期10卷 28-42页

作者： Poor.a c.andr. V. r.vi Kumar.r. Kir.n D. V. r.vi Kumar.c. r. prakash rao r. Sur.sh Depar.ment of Mec.anic.l Engineer.ng Global Academy of Technology Bengaluru India Depar.ment of Industr.al & Automation Engineer.ng VTU PG Centre Mysuru India

The Metal Matr.x c.mposites applic.tion has inc.eased in many ar.as of sc.enc. and tec.nology, bec.use of its additional physic.l, wear.and mec.anic.l pr.per.ies. In c.mpar.son with all MMc.s, aluminum-based MMc.s ar. finding wide applic.tions due to their.better.str.ngth to weight r.tio, better.stiffness, and high ther.al c.nduc.ivity as well as ver. good wear.and c.r.osion pr.per.ies. The pr.per.ies of a c.mposite mainly depend on better.distr.bution of r.infor.0}ment in the matr.x, whic. is ver. diffic.lt to ac.ieve. Basic.lly r.dmud is a bypr.duc. of alumina, and it is waste pr.duc. obtained dur.ng Bayer.s pr.c.ss. This waste pr.duc. must be r.c.c.ed else it may be danger.us to the envir.nment. r.dmud c.n be used as r.infor.0}ment for.aluminium c.mposites in or.er.to ac.ieve better.pr.per.ies. The pr.posed r.sear.0} wor. inc.udes pr.par.tion of Aluminum 6061-r.d mud metal matr.x c.mposites using liquid metallur.y r.ute following stir.c.sting tec.nique. An alloy Al6061 c.ntaining 0.60 per.0}nt silic.n and Magnesium of 0.82 per.0}nt was used as the matr.x mater.al. Two differ.nt c.mpositions of the Aluminum 6061-r.d mud c.mposites ar. pr.par.d in addition to the base matr.x and evaluated for.mec.anic.l pr.per.ies also the for.0} ac.ing on the c.tting tool at differ.nt spindle speeds dur.ng mac.ining of the c.mposite mater.als wer. analyzed.

关键词： Al6061 r.dmud Mac.ining MMc.s c.tting For.0} Measur.ment

Influenc. of Mac.ining Par.meter.on Tool Life While Mac.ining Hybr.d Metal Matr.x c.mposites

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Jour.al of Miner.ls and Mater.als c.ar.c.er.zation and Engineer.ng 2020年第6期8卷 440-458页

作者： c. r. prakash rao V. r.vi Kumar.D. V. r.vi Kumar.Poor.a c.andr. M. Vedavyasa M. S. r.jagopal Depar.ment of Mec.anic.l Engineer.ng Global Academy of Technology Bengaluru India Depar.ment of Mec.anic.l Engineer.ng Dayananda Sagar University Bangalore India

A metal matr.x c.mposite c.nstitutes a c.ntinuous metallic.matr.x and a disc.ntinuous phase known as r.infor.0}ment. The hybr.d metal matr.x c.mposites (Hmmc.) have been used to manufac.ur. dr.ve shafts, disc.br.ke r.t... 详细信息

A metal matrix composite constitutes a continuous metallic matrix and a discontinuous phase known as reinforcement. The hybrid metal matrix composites (Hmmcs) have been used to manufacture drive shafts, disc brake rotors, brake drums, connecting rods pistons, engine block cylinder liners for automotive and rail vehicle applications. The Hmmcs castings of diameter 120 mm and length 300 mm were prepared through sand mould technique following stir casting methodology. The cast components further subjected to evaluation of physical properties and machining tests using two grades of coated inserts and PCD inserts. The experiments were carried out following ISO 3685 standards. The coating thickness of the TiN coated and TiAlN coated inserts were measured using Kalo testing method; the results of the test show that the interface of the substrate and coating was free from the porosity, and the coating thickness of TiN coating was 4.84 microns and TiAlN coating was measured 4.6 microns. The results of the experiments show that performance of the PCD insert was better than coated inserts at 0.1 mm/rev feed; however at 0.2 mm/revolution feed Pc. inser. failed by mic.o c.ipping of c.tting edge while ma

关键词： c.mposites Hybr.d Metal Matr.x c.mposites c.ated Inser.s Pc. Inser.s Tur.ing Tool Life Testing

Tr.c.ing fac.al featur.s with oc.lusions

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Jour.al of Zhejiang Univer.ity-Sc.enc. A(Applied Physic. & Engineer.ng) 2006年第7期7卷 1282-1288页

作者： MAr.IN Evgeny prakash Edmond c. Sc.ool of c.mputer.Engineer.ng Nanyang Technological University Singapore

Fac.al expr.ssion r.c.gnition c.nsists of deter.ining what kind of emotional c.ntent is pr.sented in a human fac.. The pr.blem pr.sents a c.mplex ar.a for.explor.tion, sinc. it enc.mpasses fac. ac.uisition, fac.al featur. tr.c.ing, fac.al ex- pr.ssion c.assific.tion. Fac.al featur. tr.c.ing is of the most inter.st. Ac.ive Appear.nc. Model (AAM) enables ac.ur.te tr.c.ing of fac.al featur.s in r.al-time, but lac.s oc.lusions and self-oc.lusions. In this paper.we pr.pose a solution to impr.ve the ac.ur.c. of fitting tec.nique. The idea is to inc.ude oc.luded images into AAM tr.ining data. We demonstr.te the r.sults by r.nning ex- per.ments using gr.dient desc.nt algor.thm for.fitting the AAM. Our.exper.ments show that using fitting algor.thm with oc.luded tr.ining data impr.ves the fitting quality of the algor.thm.

关键词： Ac.ive Appear.nc. Model (AAM) Fac.al featur. tr.c.ing c.mputer.vision

Kinetic. of solid-state r.duc.ion of c.r.mite over.ur.en

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Inter.ational Jour.al of Miner.ls,Metallur.y and Mater.als 2023年第12期30卷 2347-2355页

作者： Saida Shaik Zhiyuan c.en Pr.eti prakash Sahoo c.enna rao Bor.a Metallur.ic.l and Mater.als Engineer.ng Depar.ment Indian Institute of Technology KharagpurKharagpurWest Bengal 721302India VITO-Flemish Institute for.Tec.nologic.l r.sear.0} Boeretang 200B-2400 MolBelgium r.sear.0} and Development Division Tata Steel Ltd.Jamshedpur 831001India

The demand for.alter.ative low-gr.de ir.n or.s is on the r.se due to the r.pid depletion of high-gr.de natur.l ir.n or. r.sour.0}s and the inc.eased need for.steel usage in daily ***,the use of low-gr.de ir.n or.s is a c.nstant c.inic.l task for.industr. *** smelting of low-gr.de or.s c.nsumes a substantial amount of ener.y due to the lar.e volume of slag *** c.ndition c.n be avoided by dir.c. r.duc.ion followed by magnetic.separ.tion(to separ.te the high amount of gangue or.r.fr.c.or. and metal par.s)and *** over.ur.en(c.B)is a mine waste gener.ted in c.r.mite or. pr.c.ssing,and it mainly c.nsists of ir.n,c.r.mium,and nic.el(r.sent wor.,the isother.al and non-isother.al kinetic. of the solid-state r.duc.ion of self-r.duc.d pellets pr.par.d using low-gr.de ir.n or.(c.B)wer. thor.ughly investigated via ther.al *** r.sults showed that the r.duc.ion of pellets followed a fir.tor.er.autoc.talytic.r.ac.ion c.ntr.l mec.anism in the temper.tur. r.nge of 900-1100℃.The autoc.talytic.natur. of the r.duc.ion r.ac.ion was due to the pr.senc. of nic.el in the *** appar.nt ac.ivation ener.y obtained fr.m the kinetic. r.sults showed that the solid-state r.ac.ions between c.B and c.r.on wer. the r.te-deter.ining step in ir.n oxide r.duc.ion.

关键词： c.r.mite over.ur.en solid-state r.duc.ion kinetic. autoc.talytic.r.ac.ion

Gr.wth Kinetic. of Nanoc.ystals and Nanor.ds by Employing Small-angle X-r.y Sc.tter.ng (SAXS) and Other.Tec.niques

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Jour.al of Mater.als Sc.enc. & Tec.nology 2008年第4期24卷 615-627页

作者： Kanishka BISWAS Neenu VAr.HESE c.N.r.rao c.emistr. and Physic. of Mater.als Unit DST Nanoscience Unit and CSIR Centre of Excellence in ChemistryJawaharlal Nehru Centre for Advanced Scientific ResearchJakkur P.O.Bangalore 560064India Solid State and Structural Chemistry UnitIndian Institute of ScienceBangalore 560012India c.emistr. and Physic. of Mater.als Unit DST Nanoscience Unit and CSIR Centre of Excellence in ChemistryJawaharlal Nehru Centre for Advanced Scientific ResearchJakkur P.O.Bangalore 560064India

In this ar.ic.e, we r.por. the r.sults of our.detailed investigations of the gr.wth kinetic. of zer.-dimensional nanoc.ystals as well as one-dimensional nanor.ds by the c.mbined use of small angel X-r.y sc.tter.ng （SAXS）, tr.nsmission elec.r.n mic.osc.py （TEM） along with other.physic.l tec.niques. The study inc.udes gr.wth kinetic. of gold nanoc.ystals for.ed by the r.duc.ion of HAuc.4 by tetr.kis（hydr.xymethyl） phosphonium c.lor.de in aqueous solution, of c.Se nanoc.ystals for.ed by the r.ac.ion of c.dmium stear.te and selenium under.solvother.al c.nditions, and of ZnO nanor.ds for.ed by the r.ac.ion of zinc.ac.tate with sodium hydr.xide under.solvother.al c.nditions in the absenc. and pr.senc. of c.pping agents. The gr.wth of gold nanoc.ystals does not follow the diffusion-limited Ostwald r.pening, and instead follows a Sigmoidal r.te c.r.e. The heat c.ange assoc.ated with the gr.wth deter.ined by isother.al titr.tion c.lor.metr. is about 10 kc.l·mol^-1 per.I nm inc.ease in the diameter.of the nanoc.ystals. In the c.se of c.Se nanoc.ystals also, the gr.wth mec.anism deviates fr.m diffusion-limited gr.wth and follows a c.mbined model c.ntaining both diffusion and sur.ac. r.ac.ion ter.s. Our.study of the gr.wth kinetic. of unc.pped and poly（vinyl pyr.llidone）（PVP）-c.pped ZnO nanor.ds has yielded inter.sting insights. We obser.e small nanoc.ystals next to the ZnO nanor.ds after.a lapse of time in addition to per.odic.foc.sing and defoc.sing of the width of the length distr.bution. These obser.ations lend suppor. to the diffusion-limited gr.wth model for.the gr.wth of unc.pped ZnO nanor.ds. Ac.or.ingly, the time dependenc. on the length of unc.pped nanor.ds follows the L3 law as r.quir.d for.diffusion-limited Ostwald r.pening. The PVP-c.pped nanor.ds, however. show a time dependenc., whic. is best desc.ibed by a c.mbination of diffusion （L^3） and sur.ac. r.ac.ion （L^2） ter.s.

关键词： Gr.wth kinetic. Gold nanoc.ystals c.Se nanoc.ystals ZnO nanor.ds Small angle X-r.y sc.tter.ng Tr.nsmission elec.r.n mic.osc.py Ostwald r.pening and sigmoidal gr.wth

Anisotr.pic.Fc.r.behaviour.in hot-r.lled Mg-3Al-0.5c. alloy

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Jour.al of Magnesium and Alloys 2024年第7期12卷 2985-3002页

作者： prakash c.Gautam Somjeet Biswas Light Metals and Alloys r.sear.0} Lab Department of Metallurgical and Materials EngineeringIndian Institute of Technology KharagpurKharagpurWest Bengal 721302India Institut für.Metallkunde und Mater.alphysik(IMM) Rheinisch-Westfälische Technische Hoschule Aachen52074 AachenGermany

In this wor.,anisotr.pic.fatigue c.ac. gr.wth r.te(Fc.r.behaviour.in a hot-r.lled Mg-3wt%Al-0.5wt%c. alloy was investigated using c.mpac. tension(c.)spec.mens with notc.(an)par.llel to the r.lling dir.c.ion(r.)and tr.nsver.e dir.c.ion(TD).The Fc.r.tests wer. c.nduc.ed at a c.nstant load r.tio(r.0.1)and maximum str.ss intensity fac.or.KMax=15.6 MPa√m)to investigate the c.ac. c.osur. *** both c.nstant r.and KMax c.nditions:(i)the load-displac.ment c.r.es for.ever. loading c.c.e wer. linear.for.a_(n)∥ to r. and TD,indic.ting no c.ac. c.osur.;(ii)the Fc.r.was found to be lower.for.an∥r. than an∥TD over.the entir. str.ss intensity fac.or.r.nge(△K).The hot-r.lled sample c.ntained long-aligned Al11c.3 inter.etallic.phase within gr.in boundar.es that ar. elongated along *** the Fc.r.test,{10.12}extension twins(ET)with lamellae∼⊥and c.axis∼∥to these elongated inter.etallic. along r. developed ir.espec.ive of the notc. *** the loading c.c.e,these inter.etallic. along r. gener.te bac.-str.sses,r.duc.ng the in-plane tensile str.ss∼||and∼⊥to c.ac.-tip to∼0 for.a_(n)∥to r. and TD,***,lentic.lar.ET∼||⊥and∼||,with c.axis∼||and∼⊥to c.ac. path ac.ivates,leading to tr.ns and inter.lamellar.c.ac. for.anto r. and TD,r.spec.ively,and anisotr.pic.*** c.ac. in a_(n)∥r. r.duc.s the Fc.r.due to plastic.ener.y dissipation as per.0}ived by c.mpar.tively mor. geometr.c.lly nec.ssar. boundar.es(GNBs).On the other.hand,faster.Fc.r.was obtained for.a_(n)∥TD due to inter.amellar.***,the c.ac. gr.wth thr.ugh the matr.x-ET inter.ac.s was favour.d due to str.in *** Fr.c.ogr.phy for.a_(n)∥r. shows smaller.elongated gr.oves along c.ac. pr.pagation,whic. indic.tes c.ac. ***,lar.er.elongated gr.oves for.a_(n)||TD indic.ted easy c.ac. pr.pagation due to favour.ble inter.amellar.c.ac..

关键词： Fatigue c.ac. gr.wth r.te(Fc.r. Magnesium(Mg) Inter.etallic. Extension twins c.ac. c.osur.

Twinning mediated anisotr.pic.fr.c.ur. behavior.in bioimplant gr.de hot-r.lled pur. magnesium

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Jour.al of Magnesium and Alloys 2024年第9期12卷 3806-3822页

作者： prakash c.Gautam Somjeet Biswas Light Metals and Alloys r.sear.0} Lab Department of Metallurgical and Materials EngineeringInstitute of Technology KharagpurKharagpurWest Bengal 721302India Institut für.Metallkunde und Mater.alphysik(IMM) Rheinisch-Westfälische Technische Hoschule AachenAachen 52074Germany

Bioimplant gr.de hot-r.lled magnesium with equiaxed mic.ostr.c.ur. and basal textur. was examined for.fr.c.ur. toughness(FT)anisotr.py using fatigue pr.-c.ac.ed single-edge notc. bending spec.mens with the notc.,an||,⊥and 45°to r.lling dir.c.ion(r.).Due to adequate c.ac.-tip plastic.ty,the size-independent elastic.plastic.fr.c.ur. toughness(JIc.wer. *** JIc.was ob-ser.ed due to differ.nt twin lamellae for.ation *** owing to the initial basal textur. with{10¯10}and{11¯20}poles mostlyand⊥to *** out-of-plane tensile str.sses ac.ivated the{10¯12}||10¯11||extension twins(ET)as usual with matr.x-ET∑15b c.inc.dent site lattic. boundar.(c.LB)*** the in-plane tensile str.ss⊥to the c.ac.-tip ac.ivated{10¯11}||10¯12||c.ntr.c.ion twins(c.)that tr.nsfor. into{10¯11}-{10¯12}double twins(DT)with matr.x-DT∑23b and∑15a *** an||r.,lar.e DT lamellae fr.c.ion for.ed at∼30°and few ETs at∼30°and∼90°to the notc. with c.ac. gr.wth mainly via the∑23b/∑15a c.LB inter.ac.s dur.ng ***,signific.nt DT and ET lamellae developed at∼0°and∼60°with c.ac.ing via the matr.x-DT∑23b/∑15a and matr.x-ET||15b c.LBs for.an⊥*** DT and ET lamellae ac.ivated at∼15°,and the c.ac. pr.pagated thr.ugh∑15b for.an∼45°to *** JIc.and the c.ac.-tip plastic.zone dec.eases,while the elastic.c.mponent of the J-integr.l(Jel)and the ET for.ation inc.eases fr.m an||,⊥,to∼45°to *** str.in inc.mpatibility of matr.c.s was higher.with the geometr.c.lly har. ETs than ***,br.ttle inter.amellar.c.ac.ing oc.ur.ed thr.ugh the∑15b *** c.ntr.st,almost similar.and higher.c.ac.-tip plastic.ty oc.ur.ed in matr.x and DT domains dur.ng c.ac. pr.pagation via||23b/||15a *** gr.wth thr.ugh∑23b/||15a led to high JIc.both∑15b and||23b/||15a led to moder.te JIc.and∑15b least JIc.for.an||,⊥and 45°to r.,r.spec.ively.

关键词： Magnesium Elastic.plastic.fr.c.ur. toughness Twins Textur. Str.in inc.mpatibility