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continuous chemical redistribution following amorphous-to-crystalline structural ordering in a Zr-Cu-Al bulk metallic glass

引用

Journal of Materials Science & Technology 2022年第6期101卷 285-293页

作者： Xuelian Wu Si Lan Xiyang Li Ming Yang Zhenduo Wu Xiaoya Wei Haiyan He Muhammad Naeem Jie Zhou Zhaoping Lu Elliot Paul Gilbert Dong Ma Xun-Li Wang Department of Physics City University of Hong KongHong KongChina Herbert Gleiter Institute of Nanoscience School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Quantum Matter Institute University of British ColumbiaVancouverBritish Columbia V6T 1Z4Canada Neutron Sciences Platform Songshan Lake Materials LaboratoryDongguan 523808China Center for Neutron Scattering and Applied Physics City University of Hong Kong Dongguan Research InstituteDongguan 523000China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Australian Centre for Neutron Scattering Australian Nuclear Science and Technology OrganisationLucas HeightsNew South Wales 2234Australia City University of Hong Kong Shenzhen Research Institute Shenzhen 518057China

Bulk metallic glasses(BMGs)are thermodynamically *** such,crystallization occurs when a BMG is thermally annealed at a temperature above the glass transition *** extensive studies have been performed on the crystallization kinetics of BMGs,most of them have focused on the amorphous-to-crystalline structural ordering,and little attention has been paid to chemical distribution and its relationship with the structural ordering during the crystallization *** this paper,a new approach,with simultaneous differential scanning calorimetry(DSC)and small angle neutron scatter-ing(SANS)measurements,was applied to study in situ the crystallization of a Zr_(45.5)Cu_(45.5)Al_(9)BMG upon isothermal annealing at a temperature in the supercooled liquid *** analysis of the DSC and SANS data showed that the structural evolution during isothermal annealing could be classified into three stages:(Ⅰ)incubation;(Ⅱ)amorphous-to-crystalline structural ordering;(Ⅲ)continuous chemical *** finding was validated by composition analysis with atom probe tomography(APT),which further identified a transition region formed by expelling Al into the *** transition re-gion,with a composition of(Cu,Al)_(50)Zr_(50),served as an intermediate step facilitating the formation of a thermodynamically stable crystalline phase with a composition of(Cu,Al)_(10)Zr_(7).

关键词： Bulk metallic glass Crystallization In situ continuous chemical redistribution Transition region

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