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

机械研磨制备纳米材料的晶界/界面结构和化学

• 批准号: 9203479
• 负责人: Carl Koch
• 金额: $ 29.08万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-07-01 至 1996-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9203479&HistoricalAwards=false
• 关键词: Grain; Boundary; Interface; Structure; Chemistry

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.

在单相材料和多相材料中检查了纳米级界面。 目的是更好地了解纳米结构材料中界面的原子水平结构和化学。 在晶界结构，能量和硬度的硬度之间进行了初步比较，这是晶粒尺寸和制备技术的函数（气雾化和机械损耗）。 金属合金和复合材料包括在研究中与单相合金进行比较。 变形和细化遵循多相合金中机械损耗变量（包括复合材料）的函数。 几种技术用于表征纳米结构状态：X射线衍射，透射电子显微镜，用于界面结构的高分辨率电子显微镜以及差分扫描量热法以测量储存的变形焓。 %%％这项研究检查了纳米结构材料的加工，结构和化学。 这是一类新的材料，由于处理结构中产生的极为细小的晶粒尺寸，可以具有独特的特性。该研究还研究了用于生产商业量的金属合金的机械合金工艺。