Dynamics of condensed matter systems

凝聚态系统动力学

• 批准号: 9985-2013
• 负责人: Sutton, Mark
• 金额: $ 4.37万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=521317
• 关键词: Dynamics; condensed; matter; systems

My research concentrates on the time evolution of microstructures. Since the microstructure depends on the history of the sample it requires nonequilibrium thermodynamics for its understanding. The microstructure of a material is central to most of its physical and mechanical properties. Not only failure rates, but many other important properties including tensile strength, chemical reactivity and magnetic coercivity, depend crucially on this morphology. The typical length scales of these structures is micrometers. It is an important fundamental problem in physics to understand how microstructures arise, how to characterize them and how they evolve in time. Disordered and nonequilibrium systems span the range of materials including binary alloys (Ni_3Al used for jet turbines) to directionally solidifying crystals (snowflakes). The nature and role of coherence and correlations in disordered systems is still not fully understood. Real-time in-situ x-ray measurements, using either time resolved diffraction or x-ray photon correlation spectroscopy, allow measurements of the microstructure under conditions similar to the conditions used in processing the materials. They are thus ideally suited to study the time evolution of microstructure.

我的研究集中在微观结构的时间演化。 由于微观结构取决于样品的历史，因此需要非平衡态热力学来理解。材料的微观结构对其大多数物理和机械性能至关重要。不仅故障率，但许多其他重要的性能，包括拉伸强度，化学反应性和磁性，取决于这种形态至关重要。这些结构的典型长度尺度是微米。理解微观结构如何产生、如何表征它们以及它们如何随时间演化是物理学中的一个重要基础问题。无序和非平衡系统的材料范围，包括二元合金（用于喷气涡轮机Ni_3Al）定向凝固晶体（雪花）。无序系统中相干性和相关性的性质和作用仍然没有完全理解。 使用时间分辨衍射或X射线光子相关光谱的实时原位X射线测量允许在与处理材料中使用的条件类似的条件下测量微观结构。因此，它们非常适合研究微观结构的时间演化。