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（CAREER）计划奖的目的是发展的原子尺度的晶界结构依赖的腐蚀增强沉淀在FCC金属的理解。 腐蚀对许多工业具有破坏性影响，包括核、海军船舶结构和离岸风力涡轮机。 晶界工程已被证明可以改善边界相关性能，包括蠕变、晶间应力腐蚀、脆化和疲劳。 然而，问题仍然存在的各向异性性质的偏析和沉淀相关的所有敏化相关的fcc材料的故障。 本项目将着重于了解晶界结构对导致腐蚀损坏的沉淀的依赖性。 从这项研究中产生的结果将作为一个预测工具，开发未来的合金抵抗有害的晶间沉淀在极端环境中。 这项工作将使用实验方法来分析温度、环境和晶界类型对腐蚀沉淀机制的综合影响，最终将对各种合金的腐蚀有更清晰的了解。这项研究有望推进对fcc金属腐蚀失效机制的基本理解，fcc金属是当今使用的最重要的结构材料之一。 费城有约80%的少数民族学生，因此将代表性不足的群体带入STEM领域的机会是巨大的。PI计划开发一个名为“涡轮机”（改造工程中代表性不足的研究基础）的项目，让当地高中少数民族和女性学生了解能源相关领域的未来职业，以激发费城和全球未来经济的研发和工程教育/培训兴趣。