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Metals 2016,6, 286 (2) The characteristicmicrostructure of the in situAl2Si4O10/Al composites via SLM tended to transfer fromthe irregularnetworkstructure toanearlysphere-likenetworkstructure inregular formingbyincreasingthe laserpower. (3) Asahighlaserpowerwasemployed,ahighpeaktemperaturewasacquiredcorrespondingly, andtheresultant Marangoni convection was generated with a high velocity, favoring the sufficientdispersionof thereinforcementswithin themoltenpool. (4) Theformationmechanismof insituAl2Si4O10 andthedistributionevolutionof thereinforcement particles during the SLM processing of Al2O3/AlSi10Mg mixed powder were present. Formationof the insituAl2Si4O10phasecouldbeattributedto thereactionamongdissociative [Al], [O], and [Si] atoms, and thedistributionof reinforcementparticleswas speculated tobe influencedsignificantlybyMarangoniconvectionandtheviscosityof themoltenmaterial. Acknowledgments: Theauthors gratefully acknowledge thefinancial support from theShanghaiAerospace ScienceandTechnologyInnovationFund(No. SAST2015053). AuthorContributions:D.D.Gu, J.B. Jue,andM.J.Xia formulatedthis researchwithcooperationfromL.F.Wang andL.J.Guo. J.B. JueandM.J.Xiaperformedtheexperimentalandsimulationwork,with thehelpofD.D.Gu, interpretedtheresults, andpreparedandrevisedthemanuscript.All co-authorscontributedtomanuscriptproof andsubmissions. Conflictsof Interest:Theauthorsdeclarenoconflictof interest. References 1. Tjong,S.C.NovelNanoparticle-ReinforcedMetalMatrixCompositeswithEnhancedMechanicalProperties. Adv. Eng.Mater. 2007,9, 639–652. [CrossRef] 2. Gu,D.D.;Yuan,P.P.Thermalevolutionbehaviorandfluiddynamicsduring laseradditivemanufacturingof Al-basednanocomposites:Underlyingroleof reinforcementweight fraction. J.Appl. Phys. 2015,118, 233109. [CrossRef] 3. VijayaRamnath,B.;Elanchezhian,C.; Jaivignesh,M.;Rajesh,S.;Parswajinan,C.; SiddiqueAhmedGhias,A. Evaluationofmechanicalpropertiesofaluminiumalloy-alumina-boroncarbidemetalmatrixcomposites. Mater.Des. 2014,58, 332–338. [CrossRef] 4. Yang,B.; Sun,M.;Gan,G.S.;Xu,C.G.;Huang,Z.J.;Zhang,H.B.;Fang,Z.Z. InsituAl2O3particle-reinforced AlandCumatrixcomposites synthesizedbydisplacement reactions. J.Alloy. Compd. 2010,494, 261–265. [CrossRef] 5. Dadbakhsh,S.;Hao,L.; Jerrard,P.G.E.;Zhang,D.Z.Experimental investigationonselective lasermelting behaviourandprocessingwindowsof insitureactedAl/Fe2O3powdermixture.PowderTechnol. 2012,231, 112–121. [CrossRef] 6. Zawrah,M.F.;Aly,M.H. Insitu formationofAl2O3-SiC-mullite fromAl-matrixcomposites.Ceram. Int. 2006, 32, 21–28. [CrossRef] 7. Olakanmi,E.O.;Cochrane,R.F.;Dalgarno,K.W.Areviewonselective laser sintering/melting (SLS/SLM)of aluminiumalloypowders: Processing,microstructure,andproperties.Prog.Mater. Sci. 2015,74, 401–477. [CrossRef] 8. Leary,M.;Mazur,M.;Elambasseril, J. Selective lasermelting(SLM)ofAlSi12Mglatticestructures.Mater. Des. 2016,98, 344–357. [CrossRef] 9. Prashanth,K.G.; Scudino, S.; Chaubey,A.K.; Löber, L.;Wang, P.; Attar,H.; Schimansky, F.P.; Pyczak, F.; Eckert, J.ProcessingofAl-12Si-TNMcompositesbyselective lasermeltingandevaluationofcompressive andwearproperties. J.Mater. Res. 2016,31, 55–65. [CrossRef] 10. Attar,H.; Löber,L.; Funk,A.;Calin,M.;Zhang,L.C.; Prashanth,K.G.; Scudino, S.; Zhang,Y.S.; Eckert, J. Mechanical behavior of porous commerciallypureTi andTi–TiB compositematerialsmanufacturedby selective lasermelting.Mater. Sci. Eng.A2015,625, 350–356. [CrossRef] 11. Gu,D.D.;Meiners,W.;Wissenbach,K.;Poprawe,R.Laseradditivemanufacturingofmetallic components: Materials,processesandmechanisms. Int.Mater. Rev. 2012,57, 133–164. [CrossRef] 12. Das,M.;Balla,V.K.;Basu,D.;Bose,S.;Bandyopadhyay,A.LaserprocessingofSiC-particle-reinforcedcoating ontitanium.Scr.Mater. 2010,63, 438–441. [CrossRef] 117