CAREER: The Role of Grain Boundary Character in Corrosion Behavior: Linking Atomic Scale Interfacial Structure to Precipitation and Failure Mechanisms

职业：晶界特征在腐蚀行为中的作用：将原子尺度界面结构与沉淀和失效机制联系起来

• 批准号: 1150807
• 负责人: Mitra Taheri
• 金额: $ 40万
• 依托单位: Drexel University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-05-01 至 2017-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1150807&HistoricalAwards=false
• 关键词: CAREER; Role; Grain; Boundary; Character

The objective of this Faculty Early Career Development (CAREER) Program award is to develop an understanding of the atomic scale grain boundary structure dependence of corrosion enhancing precipitation in fcc metals. Corrosion has a devastating effect on many industries, including nuclear, naval ship structures, and off-shore wind turbines. Grain boundary engineering has been shown to improve boundary dependent properties including creep, intergranular stress corrosion, embrittlement, and fatigue. However, questions remain about the anisotropic nature of both the segregation and precipitation relevant to all sensitization dependent failure in fcc materials. This project will focus on understanding the dependence of grain boundary structure on the precipitation that causes corrosion damage. The results generated from this study will serve as a predictive tool for developing future alloys resistant to deleterious intergranular precipitation in extreme environments. The work will use an experimental approach to analyze the combined effects temperature, environment, and grain boundary type on corrosion-causing precipitation mechanisms, which will ultimately yield a clearer understanding of corrosion in a wide range of alloys.This research is expected to advance the fundamental understanding of mechanisms of fcc metal failure under corrosion, one of the most important structural materials in use today. Philadelphia has ~80% minority student population, so the opportunity to bring underrepresented groups into STEM fields is enormous. The PI plans to develop a program, named "TURBINE" (Transforming Underrepresented Research Basis in Engineering), for local high school minority and female students to learn about future careers in energy-related fields to spur an interest in research and development and engineering education/training for a future economy both in Philadelphia and globally.

这个教师早期职业发展（职业）计划奖的目的是对原子量规模的谷物边界结构的依赖，增强FCC金属的降水量的依赖性。 腐蚀对包括核，海军船舶结构和离岸风力涡轮机在内的许多行业具有毁灭性影响。 晶界工程已显示可改善边界依赖性特性，包括蠕变，晶间应力腐蚀，封闭和疲劳。 然而，关于与FCC材料中所有敏感性依赖性失败相关的种族隔和降水的各向异性性质仍然存在的问题。 该项目将集中于理解晶界结构对造成腐蚀损害的降水的依赖性。 这项研究产生的结果将成为一种预测工具，用于开发对极端环境中有害晶间沉淀的未来合金。 这项工作将采用实验方法来分析对引起腐蚀的降水机制的组合效应温度，环境和晶界类型，最终将对多种合金中的腐蚀产生更清晰的了解。这项研究预计将提高对腐蚀下最重要的结构材料的基本理解，这是当今使用中最重要的结构材料。 费城拥有约80％的少数族裔学生人数，因此将代表人数不足的群体带入STEM领域的机会是巨大的。 PI计划制定一个名为“涡轮机”的计划（在工程学中改变了代表性不足的研究基础），以供当地的高中少数民族和女学生学习与能源相关领域的未来职业，以激发人们对费城和全球未来经济的研究，发展和工程教育/工程教育的兴趣。