Forging strength-ductility unity in a high entropy steel  

作　　者：S.J.Tsianikas Y.Chen J.Jeong S.Zhang Z.Xie 

机构地区：[1]School of Mechanical Engineering,The University of Adelaide,SA 5005,Australia [2]Centre for Advanced Thin Film Materials and Devices,Faculty of Materials and Energy,Southwest University,Chongqing 400715,China [3]Max-Planck-Institut für Eisenforschung,Max-Planck-Straße 1,Düsseldorf 40237,Germany

出　　处：《Journal of Materials Science & Technology》2022年第18期158-165,共8页材料科学技术（英文版）

基　　金：supported by an Australian Research Council Discovery Project(Grant No.DP160104632);an Aus-tralian Government Research Training Program Scholarship.Y.J.Chen acknowledges the support provided by the Australian Re-search Council(Grant No.DE210101773).

摘　　要：Fe_(72.4)Co_(13.9)Cr_(10.4)Mn_(2.7)B_(0.34)high entropy steel was prepared by magnetron sputtering.The alloy exhibits a high yield strength of 2.92±0.36 GPa while achieving appreciable plasticity of 13.7±1.9%at the ultimate compressive strength(3.37±0.36 GPa).The distribution of iron and chromium shows an un-usual,characteristic spinodal-like pattern at the nanometer scale,where compositions of Fe and Cr show strong anticorrelation and vary by as much as 20 at.%.The high strength is largely attributable to the compositional modulations,combined with fine grains with body-centered cubic(BCC)crystal structure,as well as grain boundary segregation of interstitial boron.The impressive plasticity is accommodated by the formation and operation of multiplanar,multicharacter dislocation slips,mediated by coherent in-terfaces,and controlled by shear bandings.The excellent strength-ductility combination is thus enabled by a range of distinctive strengthening mechanisms,rendering the new alloy a potential candidate for safety-critical,load-bearing structural applications.

关 键 词：Deformation mechanisms Micromechanical testing Compositional fluctuations Body-centered cubic High entropy steel 

分 类 号：TG142.1[一般工业技术—材料科学与工程]