A Study of Grain Boundary Structure and Transformations Utilizing the Faceting Phenomenon in a Cooper-Bismuth Alloy

利用铜铋合金刻面现象研究晶界结构和转变

• 批准号: 9111775
• 负责人: David Luzzi
• 金额: --
• 依托单位: University of Pennsylvania
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-11-01 至 1995-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9111775&HistoricalAwards=false
• 关键词: Study; Grain; Boundary; Structure; Transformations

This research employs the atomically flat grain-boundary facets which form as the result of solute segregation in bismuth-doped copper as a model system with which to study the relationship between grain boundary composition and structure and the evolution of structure in a two component alloy. The principal experimental tools are conventional and high-resolution transmission electron microscopy (HREM). The approach is to identify crystallographic orientations of the facet planes in each of two abutting grains for a grain pair of specific misorientation, and then determine the location of the bismuth atoms in the facets by HREM. These results are compared to atomistic calculations. Evolution of facet types is examined as a function of time and annealing temperature. %%% This research provides important information about the atomic-scale structure and chemistry of segregation at grain boundaries. Grain boundaries play an important role in determining the physical properties of polycrystalline materials.

本研究采用因铋掺杂铜中溶质偏析而形成的原子级平坦晶界面作为模型系统，研究晶界成分和结构之间的关系以及二元合金中的结构演化。 主要实验工具是传统和高分辨率透射电子显微镜（HREM）。 该方法是针对一对特定取向错误的两个邻接晶粒中的每一个晶粒中识别小平面的晶体取向，然后通过 HREM 确定小平面中铋原子的位置。 将这些结果与原子计算进行比较。 检查面类型的演变作为时间和退火温度的函数。 %%% 这项研究提供了有关晶界偏析的原子尺度结构和化学的重要信息。 晶界在决定多晶材料的物理性能方面起着重要作用。