Cold spray(CS)which has recently become a promising additive manufacturing(AM)technology,was used to fabricate ultra-strong pure copper.In addition,the effects of carrier gas species on the microstruc-tural characteristics,mechanical properties and deformation mechanisms were systemically explored.The CSAM copper manufactured with N2 carrier gas reveals a heterogeneous bimodal microstructure consist-ing of ultra-fine grains at the particle interface and relatively coarse grains in inner particles.With He carrier gas,a homogeneous grain structure consisting of ultra-fine grains in most areas was obtained.Compressive tests showed that N2 and He carrier gasses enabled ultra-high yield strengths of 340 and 415 MPa,respectively.These values are comparable to severely plastic deformed copper,which has ex-tremely low ductility and shape fidelity.On the other hand,both samples showed a strain-softening phe-nomenon that does not commonly occur at room temperature.The deformation microstructures revealed that dynamic recovery(DRV)and dynamic recrystallization(DRX)phenomena were generated despite being deformed at room temperature.Based on the above findings,the overall deformation mechanisms according to the carrier gas species in the CSAM copper manufacturing process were discussed.Further-more,the work hardening and softening behaviors of CSAM Cu are predicted by using a constitutive equation.

Department of Materials Science and Engineering,Inha University,Incheon 22212,Republic of Korea

[1]Young-Kyun Kim;Kee-Ahn Lee-.Effect of carrier gas species on the microstructure and compressive deformation behaviors of ultra-strong pure copper manufactured by cold spray additive manufacturing)[J].材料科学技术（英文版）,2022(02):264-271

CSAM

Effect,carrier,species,compressive,deformation,behaviors,ultra,strong,pure,copper,manufactured,by,cold,spray,additive,manufacturing,Cold,which,has,recently,become,promising,technology,was,used,fabricate,In,addition,effects,tural,characteristics,mechanical,properties,mechanisms,were,systemically,explored,N2,reveals,heterogeneous,bimodal,fine,grains,interface,relatively,coarse,inner,particles,With,He,homogeneous,consisting,most,areas,obtained,Compressive,tests,showed,that,gasses,enabled,high,yield,strengths,respectively,These,values,comparable,severely,plastic,deformed,tremely,low,ductility,shape,fidelity,On,other,hand,both,samples,strain,softening,nomenon,does,not,commonly,occur,room,temperature,microstructures,revealed,dynamic,recovery,DRV,recrystallization,DRX,phenomena,generated,despite,being,Based,above,findings,overall,according,process,discussed,Further,more,work,hardening,predicted,using,constitutive,equation

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