Mechanically Alloyed Iron-Based Bulk Metallic Glasses and their Characterization

这笔赠款探索了铁基大块金属玻璃的合成和详细的结构机械特性。一个主要的目标是用机械合金化的粉末冶金技术合成大块金属玻璃，然后用高温压制进行固结。其目的是通过合理选择工艺参数，制备纳米级金属间化合物颗粒在非晶态基质中的良好分散复合材料。用X射线衍射仪、透射电子显微镜和差示扫描量热仪对其结构进行了表征。将使用仪器压痕来研究合金的机械性能，以建立新型合金的结构和性能之间的关联。通过机械合金化合成大块金属玻璃及其纳米晶复合材料，将使玻璃材料能够在不能生产或用其他更传统的技术从液态开始生产截面厚度不足的系统中生产。纳米和微米尺度的仪器化压痕为定性和定量的机械表征提供了一种有效和通用的工具。工程结构尺寸的不断减小所带来的力学表征将在纳米科学和纳米技术中得到应用。更广泛的教育影响包括通过开发和引入新课程将研究融入教学中，比如《力学和材料实验技术》和《材料的非平衡加工》。计划通过佛罗里达州工程教育交付系统(FEDS)向高中和不同社区进行推广。

The grant explores synthesis and detailed structural mechanical characterization of iron-based bulk metallic glasses. A major objective is to synthesize bulk metallic glasses using powder metallurgy technique of mechanical alloying followed by consolidation using pressing at elevated temperatures. The aim is to produce composites with fine dispersion of nanometer-sized particles of intermetallics in the amorphous matrix by judicious selection of processing parameters. The structural characterization involves x-ray diffraction, transmission electron microscopy and differential scanning calorimetry. The mechanical properties will be investigated using instrumented indentation to establish the correlation between structure and properties of the new types of alloys. Synthesis of bulk metallic glasses and their nanocrystalline composites by mechanical alloying will enable production of glassy materials in the systems that could not be produced or produced insufficient section thickness by other and more traditional techniques starting from the liquid state. Instrumented indentation over nano- and microscales offers itself as an effective and versatile tool for qualitative and quantitative mechanical characterization. The mechanical characterization from the continuously decreasing size of engineering structures will have application in nanoscience and nanotechnology. The broader educational impacts include integration of research into teaching through the development and introduction of new courses such as 'Experimental Techniques in Mechanics and Materials,' and 'Non-equilibrium Processing of Materials.' The outreach is planned to high schools and diverse communities through the Florida Engineering Education Delivery System (FEEDS).