摘要
Engineering multiscale structural hierarchies in glassy alloys enable a broad spectrum of potential applications.Metallic glasses were born in hierarchical structures from atomic-to-nanometer scales.However,the frozen-in structures in traditional metallic glasses prepared by rapid quenching techniques are challenging to tailor.Here,we show that a PdNiPbulk nanostructured glass of polyamorphous interfacial structures was prepared by inert-gas condensation with a laser evaporation source,and its multiscale structures could be engineered.In-situ scattering experiment results reveal polyamorphous phase transitions occurred in the interfacial regions,which are accompanied by the evolution of medium-range order and the nanoscale heterogeneous structures during the condensation process of glassy nanoparticles under high pressure and the following heating process.Moreover,changes in the cluster connectivity resulting from repacking of the local ordering induced by pressure and temperature could be observed.The thermophysical and mechanical properties,including boson peaks,hardness,and elasticity modulus,could be changed as a function of heat-treatment parameters.Our findings would shed light on the synthesis of bulk nanostructured glassy alloys with tailorable thermodynamic and dynamical behavior as well as mechanical properties based on the understanding of metastability for polyamorphous interfacial phases.
基金
financially supported by the National Key R&D Program of China(No.2021YFB3802800)
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
30920010004
30919011404)
supports by Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology and Shenzhen Science and Technology Innovation Commission(No.JCYJ202000109105618137)
support from Qing Lan project and the distinguished professor project of Jiangsu province
support by the Shenzhen Science and Technology Innovation Committee(No.JCYJ20170413140446951)
the Ministry of Science and Technology of China(No.2016YFA0401501)
supported by the US DOE Office of Science,Office of Basic Energy Sciences。