Grain Boundaries and the Behavior of Polycrystals

晶界和多晶体的行为

• 批准号: 9204589
• 负责人: Alexander King
• 金额: $ 28.78万
• 依托单位: SUNY at Stony Brook
• 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 1995-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9204589&HistoricalAwards=false
• 关键词: Grain; Boundaries; Behavior; Polycrystals

This project combines theoretical and experimental studies of grain boundary structure and properties, particularly as related to polycrystalline aggregates. Attention is given to types of line defects not studied previously in grain boundaries and to the effects of finite grain boundary length. Computer-based experiments examine the effects of finite boundary size upon boundary structure with relevance to nanocrystalline materials. The nature and behavior of triple lines and associated defects (disclinations) are studied using computational techniques for the analysis of their geometries and experiments on copper tricrystals. Experiments are aimed at determining energy vs. misorientation relationships for grain boundaries in non-cubic materials. Transmission electron microscopy of tricrystals is employed to determine defect structure and grain boundary energies in selected metal specimens. %%% This project has as an overall goal to develop detailed understanding of the mechanisms by which grain boundary structure determines grain boundary properties. This is pertinent to all polycrystalline materials, but is particularly relevant to the new class of nanostructured materials now seeing increased research attention.

本项目结合了谷物的理论和实验研究 边界结构和性质，特别是与 多晶聚集体。 注意线的类型 以前没有研究过的晶界缺陷和缺陷 有限晶界长度的影响。 基于计算机 实验检验了有限边界尺寸对 与纳米晶材料相关的边界结构。 三重线和相关缺陷的性质和行为 使用计算技术研究（向错） 分析了它们的几何形状并在铜三晶体上进行了实验。 实验的目的是确定能量与取向误差 非立方材料中晶界的关系。 三晶体的透射电子显微镜被用来 确定缺陷结构和晶界能在选定的 金属标本 %%% 该项目的总体目标是制定详细的 理解晶界结构的机制 决定晶界性质。 这关系到所有 多晶材料，但特别是与新的 一类纳米结构材料现在看到越来越多的研究 关注