Structural Relaxation and Properties of Planar Defects in Amorphous and Nanocrystalline Metals

该基金探讨了非晶态金属和纳米晶态金属的物理性质，重点放在这些材料中剪切带和晶界的松弛。其目的是通过热处理来改变这些缺陷的松弛状态。我们的目标是使用最先进的透射电子显微镜来表征结构变化，包括高分辨率成像和能量过滤。这些材料将使用电沉积和球磨技术进行加工。我们将评估各种性质，如储存的热值、稳定性、硬度、应变率敏感性和扩散行为。这项资助的结果有望有助于从根本上理解剪切带和纳米晶界的结构，修改这种结构，以及由此产生的性质变化。这些将有助于为非晶态和纳米晶金属在MEMS和NEMS技术中的结构应用提供知识库。该助学金帮助教育和培训研究生在最先进的电子显微镜和结构材料的性质表征方面。

The grant explores the physical properties of amorphous and nanocrystalline metals with emphasis on the relaxation of shear bands and grain boundaries respectively in these materials. The objective is to modify the relaxation state of these defects by thermal treatment. The goal is to characterize the structural changes using the state-of-the-art transmission electron microscopy including high-resolution imaging and energy filtering. The materials will be processed using electrodeposition and ball milling techniques. Various properties such as the stored enthalpy, stability, hardness, strain-rate sensitivity and diffusion behavior will be evaluated.The results from the grant are expected to contribute to the fundamental understanding of the structure of shear bands and nanograin boundaries, modification of this structure, and the resulting property changes. These will contribute to the knowledge base for structuralapplications of amorphous and nanocrystalline metals such as in MEMS and NEMS technologies. The grant helps to educate and train graduate students in state-of-the-art electron microscopy and property characterization of structural materials.