The Study On Preparation Of Fe₉₀Sc₁₀ Nanoglass By Inert Gas Condensation And Its System Improvement

The development of new technologies in human society is primarily based on the application of various crystalline materials?metals,semiconductors,etc.?,as their properties can be controlled by varying their defect and/or chemical microstructures.This is not possible in today's glasses.The new features of nanoglasses—consisting of nanometer-sized glassy regions connected by glass/glass interfaces—are that their properties may be controlled by varying their defect and/or chemical microstructures via introducing plenty of glass/glass interfaces,which open a new way for the regulation of the structures and properties of glasses.In this paper,FeSc nanoglass was prepared by inert gas condensation?IGC?.The microstructure of FeSc nanoglass was characterized by X-ray diffraction?XRD?,X-ray photoelectron spectroscopy?XPS?,scanning electron microscopy?SEM?,transmission electron microscopy?TEM?and so on.The FeSc ribbon sample with the identical chemical composition of FeSc nanoglass was prepared by conventional melt spinning technique for microstructure comparison.Their mechanical properties were measured by Depth-Sensing Indentation?DSI?technique.The research results are summarized as follows:?1?Participated in the design and construction of the most advanced multi-functional IGC system in the world which can realize the preparation of nano-powder and in-situ ultra-high pressure forming of nano-powder in high vacuum environment.The maximum vacuum can reach 1E-8 Pa and the maximum pressure can be up to 8 GPa.?2?Dense compacted and non-oxidized high quality FeSc nanoglass was successfully prepared on our new IGC system.The composition of the nanoglass sample was characterized by XPS and EDS as Fe₉₀Sc₁₀;The amorphous structure was confirmed by XRD and TEM;The average size of nano-powder around 14 nm was observed by TEM;The surface morphology and element distribution were characterized by SEM.By different kinds of microstructure characterization,the unique structure of FeSc nanoglass with glass/glass interfaces could be identified.?3?The mechanical properties of nanoglass were tested by DSI.Comparing to the melt-quenched ribbon sample with identical chemical composition,the Fe₉₀Sc₁₀ nanoglass has larger modulus,lower hardness and higher strain rate sensitivity index,which indicate an enhanced plastic deformation capacity of nanoglass.?4?The IGC system was improved with a laser ablation system.The CuZrAl nanoglass with huge difference of saturated vapor pressure was successfully prepared,which is impossible obtained by thermal evaporation IGC technique.