In this work,we prepare transformable HEA/Cu nanolaminates(NLs)with equal individual layer thick-ness(h)by the magnetron sputtering technique,i.e.,Fe50Mn30Co10Cr10/Cu and Fe50Mn30Co10Ni10/Cu,and comparatively study He-ion irradiation effects on their microstructure and mechanical properties.It ap-pears that the as-deposited HEA/Cu NLs manifest two size h-dependent hardness regimes(i.e.,increased hardness at small h and hardness plateau at large h),while the He-implanted ones exhibit monotonically increased hardness.Contrary to the fashion that smaller h renders less irradiation hardening in bimetal NLs,the Fe50Mn30Co10Cr10/Cu NLs manifest the trend that smaller h leads to greater irradiation hard-ening.By contrast,the Fe50Mn30Co10Ni10/Cu NLs exhibit the maximum irradiation hardening at a critical h=50 nm.Below this critical size,smaller h results in lower radiation hardening(similar to bimetal NLs),while above this size,smaller h results in greater radiation hardening(similar to Fe5oMn30Co10Cr10/Cu NLs).Moreover,these transformable HEA/Cu NLs display inverse h-dependent strain rate sensitivity(SRS m)before and after He-ion irradiation.Nevertheless,compared with as-deposited samples,the irradi-ated Fe50Mn30Co10Cr10/Cu NLs display reduced SRS,while the irradiated Fe50Mn30Co10Ni10/Cu NLs dis-play enhanced SRS.Such unusual size-dependent irradiation strengthening and inverse h effect on SRS in irradiated samples were rationalized by considering the blocking effects of He bubbles on dislocation nucleation and motion,i.e.,dislocations shearing or bypassing He bubbles.

Y.F.Zhao;H.H.Chen;D.D.Zhang;J.Y.Zhang;Y.Q.Wang;K.Wu;G.Liu;J.Sun

State Key Laboratory for Mechanical Behavior of Materials,Xi'an Jiaotong University,Xi'an 710049,China

材料科学技术（英文版）

[1]Y.F.Zhao;H.H.Chen;D.D.Zhang;J.Y.Zhang;Y.Q.Wang;K.Wu;G.Liu;J.Sun-.Unusual He-ion irradiation strengthening and inverse layer thickness-dependent strain rate sensitivity in transformable high-entropy alloy/metal nanolaminates:A comparison of Fe50Mn30Co10Cr10/Cu vs Fe50Mn30Co10Ni10/Cu)[J].材料科学技术（英文版）,2022(21):199-213

Fe50Mn30Co10Ni10,Fe5oMn30Co10Cr10

Unusual,He,irradiation,strengthening,inverse,layer,thickness,dependent,strain,rate,sensitivity,transformable,high,entropy,alloy,nanolaminates,comparison,Fe50Mn30Co10Cr10,In,this,work,prepare,HEA,NLs,equal,individual,magnetron,sputtering,technique,comparatively,study,effects,their,microstructure,mechanical,properties,It,ap,pears,that,deposited,manifest,two,size,hardness,regimes,increased,plateau,large,while,implanted,ones,exhibit,monotonically,Contrary,fashion,smaller,renders,hardening,bimetal,trend,leads,greater,By,contrast,maximum,critical,Below,results,lower,similar,above,Moreover,these,display,SRS,before,after,Nevertheless,compared,samples,reduced,irradiated,enhanced,Such,unusual,were,rationalized,considering,blocking,bubbles,nucleation,motion,dislocations,shearing,bypassing

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