Processing for Superplasticity: A Critical Evaluation of the Role of Grain Boundaries

超塑性加工：对晶界作用的批判性评估

• 批准号: 9115443
• 负责人: Terence Langdon
• 金额: $ 30.18万
• 依托单位: University of Southern California
• 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: 1992-06-01 至 1996-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9115443&HistoricalAwards=false
• 关键词: Processing; Superplasticity; Critical; Evaluation; Role

This program examines the role of grain boundaries in affecting superplasticity. Two aluminum-based alloys are selected for the studies. These alloys are produced by two methods, mechanical alloying and powder metallurgy. The deformation characteristics and grain boundary properties are determined and correlated with the measured superplastic behavior. Transmission electron microscopy is used to examine grain misorientations. Scanning electron microscopy is employed to determine the extent of grain boundary sliding. An improved model of superplastic forming should result. %%% A fundamental understanding of grain boundary properties in fine- grained alloys is needed for future development of enhanced superplasticity in metal alloys. This type of processing can result in low cost, near-net shape forming of structural metal components.

该计划研究了晶界在影响 超塑性 选择了两种铝基合金用于 问题研究 这些合金通过两种方法生产，机械 合金化和粉末冶金。 变形特征 和晶界性质被确定并与 测量的超塑性行为。 透射电子 使用显微镜检查晶粒取向差。 扫描 电子显微镜是用来确定粮食的程度 边界滑移 一种改进的超塑成形模型， 结果. %%% 对细晶中晶界性质的基本认识- 晶粒合金是未来发展增强 金属合金的超塑性 这种类型的处理可以 导致结构金属的低成本、近净成形 件.