Understanding the atomic structure of shear bands in metallic glass using a newly developed STEM diffraction technique: RDF imaging

使用新开发的 STEM 衍射技术了解金属玻璃中剪切带的原子结构：RDF 成像

• 批准号: 394558024
• 负责人: Dr. Xiaoke Mu, Ph.D.
• 金额: --
• 依托单位: Institut für Nanotechnologie (INT)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/394558024?language=en
• 关键词: Understanding; atomic; structure; shear; bands

Within the proposed project, we plan to provide the first direct experimental verification of the atomic-structure in shear bands of bulk metallic glasses (BMGs) and compare them with the parent matrix by using radial distribution function imaging (RDFI). The structural investigation will focus on the short- and medium range atomic order in terms of bond length, bond angle and coordination number and their variation in individual shear bands. The corresponding changes in atomic density, topological and chemical order will be compared to theoretical simulations and other indirect experimental observations. The results will be key information to understand the processes during shear band formation and create a starting point to correlate the structure and mechanical properties of BMGs. The principle method enabling a detailed local structural analysis of amorphous phase will be further improved and extended to characterize individual shear bands and variations in heterogeneous glassy materials.

在拟议的项目中，我们计划提供第一个直接的实验验证的原子结构的剪切带的大块金属玻璃（BMG），并比较它们与母矩阵通过使用径向分布函数成像（RDFI）。结构研究将集中在短和中程原子顺序的键长，键角和配位数及其在个别剪切带的变化。原子密度、拓扑和化学顺序的相应变化将与理论模拟和其他间接实验观察进行比较。这些结果将是理解剪切带形成过程的关键信息，并为BMG的结构和力学性能之间的关联奠定基础。使详细的非晶相的局部结构分析的原则方法将进一步改进和扩展到表征个别剪切带和异质玻璃材料的变化。