Medium-range order endows a bulk metallic glass with enhanced tensile ductility  

作　　者：Sinan Liu Weixia Dong Zhiqiang Ren Jiacheng Ge Shu Fu Zhenduo Wu Jing Wu Yu Lou Wentao Zhang Huaican Chen Wen Yin Yang Ren Joerg Neuefeind Zesheng You Ying Liu Xun-Li Wang Si Lan 

机构地区：[1]Herbert Gleiter Institute of Nanoscience,School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China [2]Department for Physics,City University of Hong Kong,83 Tat Chee Avenue,Kowloon,Hong Kong SAR,China [3]City University of Hong Kong Shenzhen Research Institute,Shenzhen 518057,China [4]City University of Hong Kong(Dongguan),Dongguan 523000,China [5]Cryo-TEM center,Southern University of Science and Technology,Shenzhen 518055,China [6]Spallation Neutron Source Science Center,Institute of High Energy Physics(IHEP),Chinese Academy of Sciences(CAS),Dongguan 523808,China [7]Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology,1 Zhongziyuan Road,Dalang,Dongguan 523803,China [8]Chemical and Engineering Materials Division,Oak Ridge National Laboratory,Oak Ridge,Tennessee,37831,USA

出　　处：《Journal of Materials Science & Technology》2023年第28期10-20,共11页材料科学技术（英文版）

基　　金：the National Key R&D Program of China(No.2021YFB3802800);the National Natural Sci-ence Foundation of China(Nos.52222104,12261160364,51871120 and 51520105001);the Natural Science Foundation of Jiangsu Province(No.BK20200019);Si Lan acknowledges the support by Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scat-tering Science and Technology and Shenzhen Science and Technol-ogy Innovation Commission(No.JCYJ20200109105618137);the resources of the China Spallation Neutron Source located in Dongguan,China,and the Advanced Photon Source,a US Department of Energy(DOE)Office of Science User Facility op-erated for the DOE Office of Science by Argonne National Labora-tory under Contract No.DE-AC02-06CH11357;the US DOE Office of Science,Office of Basic Energy Sciences.The neutron scattering experiments carried out at the Spallation Neutron Source were sponsored by the Scientific User Facilities Di-vision,Office of Basic Energy Sciences,U.S.Department of Energy,under Contract No.DE-AC05-00OR22725 with Oak Ridge National Laboratory.

摘　　要：Developing ductile bulk metallic glasses(BMGs)can benefit from an in-depth understanding of the structure-property relation during plastic deformation.However,endowing BMGs with tensile ductility in BMGs needs to reveal the response of critical structure units during deformation.Here,we report the experimental results of an in-situ synchrotron high-energy X-ray study of a Zr-based BMG under uniaxial tension after preprocessing by canning compression of the three-dimensional compressive stress state.It is revealed that the canning-compressed BMG(CC-BMG)sample has better tensile ductility and higher ultimate strength than the as-cast sample,which possesses heterogeneous and loosely packed local struc-tures on medium-range scales.The experimental results revealed two stages of plastic deformation in the CC-BMGs compared with one stage of plastic deformation in the as-cast BMG.Moreover,the shift in the first sharp diffraction peak along the tension direction for the canning-compressed sample is substan-tially more pronounced than that of the as-cast sample.Furthermore,the real-space analysis illustrates a competition mechanism between the 2-atom and 3-atom connection modes on medium-range order during the plastic deformation of the CC-BMG.Additionally,the ordering on the medium-range scale de-creases in the first plastic deformation stage but increases in the second plastic deformation stage.There-fore,a structural crossover phenomenon occurs in the CC-BMG during plastic deformation.Our results demonstrate a structure-property correlation for the CC-BMGs of heterogeneous medium-range ordered structures,which may be beneficial for endowing BMGs with ductility based on medium-range order engineering techniques.

关 键 词：Bulk metallic glass Medium-range order Tensile ductility Structure-property relation 

分 类 号：TG139.8[一般工业技术—材料科学与工程] TB33[金属学及工艺—合金]