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In situ scattering study of multiscale structural evolution during liquid–liquid phase transition in Mg-based metallic glasses

查看全文 作　　者：Kang-Hua [1]Li;Jia-Cheng [1]Ge;Si-Nan [1]Liu;Shu [1]Fu;Zi-Xuan [1]Yin;Wen-Tao [1]Zhang;Guo-Xing [2]Chen;Shao-Chong [2]Wei;Hua [2,3]Ji;Tao [1]Feng;Qi [4,5]Liu;Xun-Li [4,5]Wang;Xiao-Bing [6]Zuo;Yang [6]Ren;Horst [7]Hahn;Si [1]Lan 高影响力作者 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]Suzhou Nuclear Power Research Institute Co.,Ltd,Suzhou 215004,China;[3]Key Laboratory of Advanced Materials(MOE),School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China;[4]Department of Physics,City University of Hong Kong,Hong Kong 999077,China;[5]Center for Neutron Scattering,City University of Hong Kong Shenzhen Research Institute,Shenzhen 518057,China;[6]X-Ray Sciences Division,Argonne National Laboratory,Lemont,IL 60439,USA;[7]Institute of Nanotechnology,Karlsruhe Institute of Technology(KIT),Eggenstein-Leopoldshafen 76344,Germany高影响力机构 出　　处：《Rare Metals》索引2021年第40卷第11期,共10页高影响力期刊 基　　金：financially supported by the National Natural Science Foundation of China(No.51871120);the Natural Science Foundation of Jiangsu Province(No.BK20200019);the Fundamental Research Funds for the Central Universities(Nos.30919011107 and 30919011404);support by Shenzhen Science and Technology Innovation Committee(No.JCYJ20170413140446951);the supports by Shenzhen Science and Technology Innovation Commission(No.JCYJ20180507181806316);the supports by Shenzhen Science and Technology Innovation Commission(No.JCYJ202000109105618137);the Ministry of Science and Technology of China(No.2016YFA0401501)。 摘　　要：The glass-forming ability of Mg-Cu-Gd alloys could be significantly promoted with the addition of Ag.A calorimetric anomaly could be observed in the supercooled liquid region of the Mg-Cu-Ag-Gd metallic glass,indicating the occurrence of a liquid-state phase transition driven by entropy.However,the underlying mechanism of the polyamorphous phase transition remains unsettled.In the paper,in situ scattering techniques were employed to reveal multiscale structure evidence in a Mg65Cu15Ag10Gd10metallic glass with an anomalous exothermic peak upon heating.Resistivity measurements indicate a reentrant behavior for the Mg-Cu-Ag-Gd metallic glass in the anomalous exothermic peak temperature region during heating.In situ synchrotron diffraction results revealed that the local atomic structure tends to be ordered and loosely packed first,followed by reentering into the initial state upon heating.Moreover,time-resolved small-angle synchrotron X-ray scattering(SAXS) results show an increase in nanoscale heterogeneity first followed by a reentrant supercooled liquid behavior.A core-shell structure model has been used to fit the SAXS profiles when polyamorphous phase transition occurs.In contrast,there is no structure anomaly for the reference Mg-Cu-Gd alloy system.The detailed multiscale structural evidence suggests the occurrence of a liquid-liquid phase transition followed by a reentrant behavior in the MgCu-Ag-Gd metallic glass.Our results deepen the understanding of the structural origin of the glass-forming ability and shed light on the possibility of tuning the physical and mechanical properties by heat-treatment in the supercooled liquid region of Mg-based metallic glasses. 关 键 词：Metallic glasses Anomalous exothermal peak Polyamorphous transition Synchrotron scattering
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