High-throughput investigations of configurational-transformation-dominated serrations in CuZr/Cu nanolaminates  

作　　者：William Yi Wang Bin Gana Deye Lin Jun Wang Yiguang Wang Bin Tang Hongchao Kou Shunli Shang Yi Wang Xingyu Gao Haifeng Song Xidong Hui Laszlo J.Kecskes Zhenhai Xia Karin A.Dahmen Peter K.Liaw Jinshan Lia Zi-Kui Liu 

机构地区：[1]State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an.710072,China [2]Beijing Key Laboratory of Advanced High Temperature Materials,Central Iron and Steel Research Institute,Beijing,100081,China [3]IMDEA Materials Institute,Calle Eric Kandel 2,Getafe,Madrid,28906,Spain [4]CAEP Software Center for High Performance Numerical Simulation,Institute of Applied Physics and Computational Mathematics,Beijing,100088,China [5]Department of Materials Science and Engineering,The Pennsylvania State University,University Park,PA,16802,USA [6]State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing,100083,China [7]Hopkins Extreme Materials Institute,Johns Hopkins University,Baltimore,MD,21218,USA [8]Department of Physics,University of Illinois at Urbana Champaign,Urbana,IL,61801,USA [9]Department of Materials Science and Engineering,The University of Tennessee,Knoxville,TN,37996,USA

出　　处：《Journal of Materials Science & Technology》2020年第18期192-199,共8页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51690163 and 51601147);the Science Challenge Project(No.TZZT2019-D1.5);the Ministry of Science and Technology of China(No.2017YFA0700700);the United States National Science Foundation(Nos.DMR-1006557,1611180,and 1809640);the Fundamental Research Funds for the Central Universities in China(No.G2016KY0302);the CyberStar cluster funded by NSF through grant No.OCI-0821527;the XSEDE clusters supported by NSF through Grant No.ACI-1053575。

摘　　要：Metallic amorphous/crystalline(A/C)nanolaminates exhibit excellent ductility while retaining their high strength.However,the underlying physical mechanisms and the resultant structural changes during plastic deformation still remain unclear.In the present work,the structure-property relationship of CuZr/Cu A/C nanolaminates is established through integrated high-throughput micro-compression tests and molecular dynamics simulations together with high-resolution transmission electron microcopy.The serrated flow of nanolaminates results from the formation of hexagonal-close-packed(HCP)-type stacking faults and twins inside the face-centered-cubic(FCC)Cu nano-grains,the body-centered-cubic(BCC)-type ordering at their grain boundaries,and the crystallization of the amorphous CuZr layers.The serration behavior of CuZr/Cu A/C nanolaminates is determined by several factors,including the formation of dense dislocation networks from the multiplication of initial dislocations that formed after yielding,weak-spots-related configurational-transitions and shear-transition-zone activities,and deformation-induced devitrification.The present work provides an insight into the heterogeneous deformation mechanism of A/C nanolaminates at the atomic scale,and mechanistic base for the microstructural design of self-toughening metallic-glass(MG)-based composites and A/C nanolaminates.

关 键 词：NANOLAMINATES SERRATION Configurational transformation Molecular dynamics Metallic glass 

分 类 号：TB383.1[一般工业技术—材料科学与工程]