Microstructure and Stability of Metallic Nanoglasses

金属纳米玻璃的微观结构和稳定性

基本信息

批准号：
30799144
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：
Research Grants
财政年份：
2006
资助国家：
德国
起止时间：
2005-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/30799144?language=en
关键词：
Microstructure Stability Metallic Nanoglasses

项目摘要

Metallic nanoglasses are dense glasses with a significantly increased excess volume. They can be synthesized by consolidating amorphous metallic nanoparticles and exhibit a property profile that is clearly different from a melt spun bulk glass of the same composition. By means of molecular dynamics simulations of binary model glasses (Cu-Zr) we could show that glass-glass interfaces are characterized by a modified local order and an excess volume similar to that found in shear bands induced by plastic deformation. Experimentally studied Fe-Sc glasses exhibit clearly modified mechanical and magnetic properties and show a nanosized structural elements in the microstructure. It is the main goal of this research project to gain a consistent picture of the microstructural features of nanoglasses. Our primary scientific objective is to understand the physical origin of the massive density fluctuations that are observed experimentally and to find reasons for the unexpected thermal stability of nanoglasses.. In particular, we will study the sintering mechanisms occurring during cold compaction by varying particle sizes, pressures and materials. Experimentally, we will extend our study by non-magnetic Pd-Si, which can also be described by classical molecular dynamics simulations, while electronic structure calculations of Fe-Sc in bicrystal geometry shall assist in quantifying the experimental findings.

金属纳米类是密集的玻璃，其体积过量显着增加。它们可以通过合并无定形金属纳米颗粒并表现出与相同组成的熔体旋转大块玻璃明显不同的特性曲线来合成它们。通过二进制模型玻璃（CU-ZR）的分子动力学模拟，我们可以表明玻璃玻璃界面的特征是经过修改的局部顺序和与塑性变形引起的剪切带相似的多余体积。实验研究的FE-SC玻璃表现出明显修饰的机械和磁性特性，并在微观结构中显示出纳米化的结构元素。这是该研究项目的主要目标，旨在一致地了解纳米类的微观结构特征。我们的主要科学目标是了解实验观察到的巨大密度波动的物理起源，并找到纳米类的意外热稳定性的原因。特别是，我们将研究通过不同粒径，压力，压力和材料在冷压缩过程中发生的烧结机制。在实验上，我们将通过非磁性PD-SI扩展研究，这也可以通过经典的分子动力学模拟来描述，而双晶几何学中Fe-SC的电子结构计算应有助于量化实验发现。