Local Atomic Arrangements in Alloys and Intermetallics

本研究的目的是研究几种显示亚稳过渡态的金属合金体系中的局部原子秩序。在铝-铜-镁合金、铁-铍合金和镍-铍合金中，均相析出的早期阶段进行了检验。研究了镍铝合金的析出，以便更好地了解有序析出物的形成。测定了淬火后铁马氏体的组织；从回火的结构变化也追求。用同步加速器异常色散技术测定了碲化汞镉的局部原子序。先进的x射线衍射方法是表征合金体系的主要实验工具。先进的漫射x射线散射技术从原子位移和相关的分析是研究的一部分。

The purpose of this research is to examine local atomic order in several metallic alloy systems that display a metastable transitional state. Early stages of homogeneous precipitation is examined in aluminum-copper-magnesium, iron-beryllium and nickel-beryllium alloys. Precipitation from nickel-aluminum alloys is studied to better understand formation of ordered precipitates. The structure of ferrous martensites immediately following the quench is being determined; structural changes from tempering is also pursued. Local atomic order in mercury- cadmium-telluride is being determined using synchrotron anomalous dispersion techniques. Advanced X-ray diffraction methods are the primary experimental tool used to characterize the alloy systems. Advanced diffuse X-ray scattering techniques from atomic displacements and the associated analysis are part of the research.