Observation of Hydrogen Interactions with Defects in Metals

该基金研究氢原子相互作用的基本原理 金属中的缺陷。 采用的实验技术规模较小 中子角散射，透射电子显微镜 (TEM)大角度中子散射和伽马射线衍射。 最近已经证明SANS可以直接揭示 空间分布的氢同位素，氘，被困在 位错和晶界。 的依赖性 氘浓度、缺陷 使用SANS检查浓度和温度。 确定 杂质偏析的相关影响，如碳和 位错和晶界处的硫是 这个项目的。 %%% 本研究丰富了固溶缺陷相关知识库 相互作用，重要的机械和物理性能， 金属和合金。

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.