Forging strength-ductility unity in a high entropy steel

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

作者机构：School of Mechanical EngineeringThe University of AdelaideSA 5005Australia Centre for Advanced Thin Film Materials and DevicesFaculty of Materials and EnergySouthwest UniversityChongqing 400715China Max-Planck-Institut für EisenforschungMax-Planck-Straße 1Düsseldorf 40237Germany 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第113卷第18期

页      面：158-165页

核心收录：

学科分类：0806[工学-冶金工程] 0817[工学-化学工程与技术] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0802[工学-机械工程] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

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) 

主　　题：Deformation mechanisms Micromechanical testing Compositional fluctuations Body-centered cubic High entropy steel 

摘      要：Fe_(72.4)Co_(13.9)Cr_(10.4)Mn_(2.7)B_(0.34)high entropy steel was prepared by magnetron *** 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 *** impressive plasticity is accommodated by the formation and operation of multiplanar,multicharacter dislocation slips,mediated by coherent in-terfaces,and controlled by shear *** 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.