Grain Boundary/Interface Structure and Chemistry in Nanoscale Materials Prepared by Mechanical Attrition

纳米尺度的界面检查在这两个单相材料 和多相材料。 目标是获得更好的 了解原子水平结构和化学 纳米结构材料中的界面。 初步比较如下： 晶界结构、能量和硬度之间的关系， 作为晶粒尺寸和制备函数的铁基合金 技术（气体雾化和机械研磨）。 金属间化合物合金和复合材料是研究的对象 用于与单相合金进行比较。 变形与晶粒 细化是机械磨损的函数 多相合金中的变量，包括复合材料。 几 技术用于表征纳米结构状态：X射线 衍射，透射电子显微镜，高分辨 电子显微镜观察界面结构， 用扫描量热法测量变形的储存焓。 %%% 这项研究探讨了加工，结构和化学 纳米结构材料 这是一种新型材料， 由于极细的颗粒， 在加工结构中形成的尺寸。研究还 研究了机械合金化过程中使用的生产 商业数量的金属合金。

Nanoscale interfaces are examined in both single phase materials and multiphase materials. The goal is to obtain a better understanding of the atomic level structure and chemistry of interfaces in nanostructured materials. An initial comparison is made between grain boundary structures, energies and hardness in an iron-based alloy as a function of grain size and preparation technique (gas atomization and mechanical attrition). Intermetallic alloys and composites are included in the research for comparison to the single phase alloys. Deformation and grain refinement are followed as a function of mechanical attrition variables in multiphase alloys, including composites. Several techniques are used to characterize the nanostructured state: X-ray diffraction, transmission electron microscopy, high resolution electron microscopy for interface structure, and differential scanning calorimetry to measure the stored enthalpy of deformation. %%% This research examines the processing, structure, and chemistry of nanostructured materials. This is a new class of materials that can possess unique properties because of the extremely fine grain size developed in the processed structure. The research also examines the mechanical alloying process used in producing commercial quantities of metal alloys.