Exploration of local structural environment in radiation damage tolerant materials

耐辐射损伤材料局部结构环境探索

• 批准号: 2740215
• 金额: --
• 依托单位: University of Sheffield
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2740215
• 关键词: Exploration; local; structural; environment; radiation

High entropy alloys, a relatively new class of materials, represent a novel alloy design strategy based on combining multiple elements in near-equiatomic proportions. The field is based on four core principles, many of which directly relate to atomic scale structural effects within the system, such as local atomic displacements and configurational environments. These materials are being investigated for a number of possible applications. One potential beneficial property demonstrated by some high- and medium-entropy alloys is radiation damage tolerance for nuclear applications, which it has been suggested relates to the local environment. Answering questions about the local atomic environment in these materials is essential if they are to be tuned for purpose.Total scattering, a type of diffraction method based on examining the pattern produced by X-rays/Neutrons scattered from a sample, provides a probe of the local atomic environment in material systems. The development of large box modelling methods, Reverse Monte Carlo, has already provided useful insights in a host of complex chemical systems, functional oxides and metal organic frameworks from total scattering data. Recently, the application of the technique has been demonstrated for exploring local effects, such as short-range order, in simple binary metallic systems. This PhD project will look at the application of total scattering to the study of radiation damage tolerant materials. Materials demonstrating promising radiation damage tolerant properties will be selected. The physical properties of the material will be tested and correlated with the underlying local structure.

高熵合金是一类相对较新的材料，它代表了一种新的合金设计策略，它是将多个元素以接近等原子的比例组合在一起的。该领域基于四个核心原则，其中许多直接涉及系统内的原子级结构效应，如局部原子位移和构型环境。这些材料正在研究一些可能的应用。一些高熵和中熵合金表现出的一个潜在的有益性质是对核应用的辐射损伤容忍度，这已被认为与当地环境有关。如果要对这些材料进行调谐，回答有关这些材料中局部原子环境的问题是必不可少的。总散射是一种基于检查样品中X射线/中子散射产生的图案的衍射法，它提供了一种探测材料系统中局部原子环境的方法。大盒子模拟方法的发展，即逆蒙特卡罗方法，已经从总散射数据中为一系列复杂的化学体系、功能氧化物和金属有机骨架提供了有用的见解。最近，该技术已被应用于探索简单的二元金属系统中的局域效应，如短程有序。这个博士项目将着眼于总散射在耐辐射损伤材料研究中的应用。将选择表现出良好的抗辐射损伤性能的材料。材料的物理性能将进行测试，并与基本的局部结构相关联。