In current work,Ni-Ti-CeO2 nanocomposite coatings were achieved by co-adding Ti microparticles and CeO2 nanoparticles.Designed experiments and COMSOL computer simulation were applied to reveal the synergistic role of Ti microparticles and CeO2 nanoparticles in tailoring the spatial microstructures and properties of Ni-Ti-CeO2 nanocomposite coating.Unilaterally,the conductive Ti microparticles conducted the growth behavior of Ni grains by current density concentration,distorting electronic field lines and heterogeneous nucleation.Individual domains consisting of inner nanograins and outer radial columnar grains surrounded Ti microparticles,where Ti microparticles acted as seeds.Ti microparticles tended to be aggregated,leading to spatial heterogeneity of microstructures.Ni deposits buried the Ti microparticles in forms of"covering model",contributing to the formation of inside voids and rough surface and aggre-gation of Ti microparticles;on the other hand,the non-conductive CeO2 microparticles hardly changed the distribution of current density and electronic field lines on the cathode surface.Ni deposits buried the CeO2 microparticle in forms of"stacking model",avoiding the inside voids and aggregation of particles.The incorporation of CeO2 microparticle brought in microstructure evolutions only on its top side without disturbing the growth behavior of Ni grains on its lateral side or bottom,suggesting the limited effects.This was correlated with the presence of current concentration above the CeO2 microparticle at the last stage of burying CeO2 microparticle.The co-addition of Ti microparticles and CeO2 nanoparticles into Ni deposits exploited the complementary action of the two particles,which gave birth to satisfied spatial microstructures and improved hardness.Ti microparticles took major responsibility for microstructure evolutions,while the CeO2 nanoparticles were mainly in charge of the microstructure homogeneity.

Lianbo Wang;Shilong Xing;Zizhen Shen;Huabing Liu;Chuanhai Jiang;Vincent Ji;Yuantao Zhao

School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Zhejiang Scientific Research Institute of Transport,Hangzhou 310023,China;ICMMO/SP2M,Universite Paris-Saclay,Orsay 91405,France;Merchant Marine College,Shanghai Maritime University,Shanghai 201306,China

材料科学技术（英文版）

[1]Lianbo Wang;Shilong Xing;Zizhen Shen;Huabing Liu;Chuanhai Jiang;Vincent Ji;Yuantao Zhao-.The synergistic role of Ti microparticles and CeO2 nanoparticles in tailoring microstructures and properties of high-quality Ni matrix nanocomposite coating)[J].材料科学技术（英文版）,2022(10):182-193

Unilaterally,distorting,burying

synergistic,role,Ti,microparticles,CeO2,nanoparticles,tailoring,microstructures,properties,high,quality,matrix,nanocomposite,current,work,coatings,were,achieved,by,adding,Designed,experiments,COMSOL,computer,simulation,applied,reveal,spatial,conductive,conducted,growth,behavior,density,concentration,electronic,field,lines,heterogeneous,nucleation,Individual,domains,consisting,inner,nanograins,outer,radial,columnar,surrounded,where,acted,seeds,tended,aggregated,leading,heterogeneity,deposits,buried,forms,covering,model,contributing,formation,inside,voids,surface,other,hand,hardly,changed,distribution,cathode,stacking,avoiding,aggregation,incorporation,brought,evolutions,only,top,without,disturbing,bottom,suggesting,limited,effects,This,was,correlated,presence,above,last,stage,addition,into,exploited,complementary,action,two,which,gave,birth,satisfied,improved,hardness,took,major,responsibility,while,mainly,charge,homogeneity

0.432419