Abstract
Like crystalline materials, the properties of amorphous materials can be tailored by tuning the local atomic-to-nanoscale structural configurations. Polyamorphism is evident by the coexistence of kinetically stabilized amorphous structures with tailorable short-to-medium-range orders, providing a viable means to engineer the degree of local order and heterogeneity. Here, we report experimental evidence of the coexistence of liquid-like and solid-like amorphous phases in a Ni82P18 amorphous alloy with enhanced thermal stability and plasticity prepared by pulsed electrodeposition. The two amorphous phases, of comparable volume fraction of ~50% each, have similar short-range order but are distinguished by packing at the medium-range length scale (>6 Å). Upon heating, a structure crossover at ~450 K was observed, where the liquid-like structure transforms to the solid-like structure, as evidenced by the enthalpy release and an anomalous contraction of atomic structure over the medium-range length scale, due to the metastable nature of the liquid-like structure.
Highlights
IntroductionThe properties of amorphous materials can be tailored by tuning the local atomic-to-nanoscale structural configurations
Like crystalline materials, the properties of amorphous materials can be tailored by tuning the local atomic-to-nanoscale structural configurations
It would be possible to modify the local order in disordered materials by temperature or pressure-induced Polyamorphous phase transitions (PPTs), which should lead to tailorable properties for amorphous materials, such as the thermal stability and mechanical properties[7]
Summary
The properties of amorphous materials can be tailored by tuning the local atomic-to-nanoscale structural configurations. 7 Center for Neutron Scattering, City University of Hong Kong, Shenzhen Research Institute, 8 Yuexing 1st Road, Shenzhen Hi-Tech Industrial Park, Nanshan District, Shenzhen 518057, The structure of amorphous materials is characterized by disorder on the long-range length scale but by local order at short-range to medium-range length scales[1,2,3,4] This complexity has led to some ambiguities in describing these structures, for evolving structures during phase transitions, e.g., glass transitions[1,5]. If one can obtain ED Ni–P amorphous alloys of dual phases with appropriate volume fractions by, for example, changing the parameters during deposition, it could be possible to tailor the packing scheme at medium-range order (MRO) in the amorphous state Those changes in microstructure would be manifested in the structure factor, which can be determined using diffraction measurements. It would be possible to modify the local order in disordered materials by temperature or pressure-induced PPTs, which should lead to tailorable properties for amorphous materials, such as the thermal stability and mechanical properties[7]
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