Observation of Hydrogen Interactions with Defects in Metals

氢与金属缺陷相互作用的观察

• 批准号: 9213867
• 负责人: Brent Heuser
• 金额: $ 12.99万
• 依托单位: University of Missouri-Columbia
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-03-01 至 1995-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9213867&HistoricalAwards=false
• 关键词: Observation; Hydrogen; Interactions; Defects; Metals

This grant investigates fundamentals of hydrogen atom interactions with defects in metals. Experimental techniques employed are small angle neutron scattering (SANS), transmission electron microscopy (TEM), large angle neutron scattering, and gamma ray diffraction. Recently it has been demonstrated that SANS can reveal directly the spatial profiles of the hydrogen isotope, deuterium, trapped at dislocations and grain boundaries in palladium. The dependency of the trapping strength on deuterium concentration, defect concentration, and temperature is examined using SANS. Determining the associated effects of impurity segregation, such as carbon and sulphur, at dislocations and grain boundaries is an integral part of this program. %%% This research adds to the knowledge base related to solute-defect interactions, important to mechanical and physical properties of metals and alloys.

该赠款研究了与金属缺陷的氢原子相互作用的基础。 所采用的实验技术是小角度中子散射（SAN），透射电子显微镜（TEM），大角度中子散射和γ射线衍射。 最近，已经证明SAN可以直接揭示氢同位素，氘的空间谱，被困在钯中的位错和晶界。 使用SAN检查捕获强度对氘浓度，缺陷浓度和温度的依赖性。 确定杂质分离的相关作用，例如碳和硫，在位错和晶界处是该程序不可或缺的一部分。 %% %%这项研究增加了与溶质缺陷相互作用相关的知识库，对金属和合金的机械和物理特性很重要。