Nanoglasses - A way to enhanced mechanical properties of amorphous materials

纳米玻璃 - 增强非晶材料机械性能的一种方法

• 批准号: 224504410
• 负责人: Professor Dr. Karsten Albe
• 金额: --
• 依托单位: Institut für Nanotechnologie (INT)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/224504410?language=en
• 关键词: Nanoglasses; way; enhanced; mechanical; properties

Plastic deformation of conventional metallic glasses, which are characterized by a homogeneous atomic structure and chemistry, leads to the formation of few shear bands with the consequence of inhomogeneous deformation and brittle fracture. The disturbance of the homogeneous structure due to interglass interfaces on the nanometer-scale, as possible in nanoglasses prepared by consolidation of amorphous nanoparticles, can lead to improved plasticity, higher strength and ductility, completely different from the conventional rapidly quenched amorphous alloys. The aim of the project is to identify the topological properties of interglass interfaces and to understand their influence on the mechanical properties of nanoglasses. Initially, metallic glass systems, such as FeSc- and PdSi-based alloys, are considered in order to establish the atomic structure of the interglass interfaces and their role for plastic deformation. All experimental work on the structure and mechanical properties will be complemented by computer simulations, initially on the CuZr system and at a later stage on the PdSi system. For the PdSi-system an appropriate potential will be developed. The concept of nanoglasses can be systematically extended to ionic materials and to synthesis methods which allow faster and less expensive production on a larger scale. Besides the measurements of the elastic and plastic deformation using a variety of techniques, the details of the structure of the nanoglasses will be determined by using XRD, EXAFS, SEM, TEM, etc.

传统金属玻璃具有均匀的原子结构和化学性质，在塑性变形过程中会形成少量的剪切带，从而导致不均匀变形和脆性断裂。在非晶纳米颗粒固结制备的纳米玻璃中，在纳米尺度上由于玻璃间界面的干扰而导致均匀结构的破坏，可以导致塑性的改善，强度和延展性的提高，完全不同于传统的快速淬火非晶合金。该项目的目的是确定玻璃间界面的拓扑特性，并了解它们对纳米玻璃机械性能的影响。首先，考虑金属玻璃系统，如FeSc和pdsi基合金，以建立玻璃界面的原子结构及其对塑性变形的作用。所有关于结构和机械性能的实验工作都将通过计算机模拟进行补充，首先在CuZr系统上进行，然后在PdSi系统上进行。对于pdsi系统，将开发适当的潜力。纳米玻璃的概念可以系统地扩展到离子材料和合成方法，这些方法可以在更大的规模上更快、更便宜地生产。除了使用各种技术测量纳米玻璃的弹塑性变形外，还将使用XRD， EXAFS， SEM， TEM等来确定纳米玻璃的结构细节。