基因性团簇变异增韧铁基非晶纳米晶合金的理论与方法

The intrinsic brittleness of Fe-based amorphous alloys has severely restricted their fabrication and performance, and the securities of devices in which these alloys are used. In this project, we propose an academic idea named the toughening of Fe-based amorphous and nanocrystalline alloys by the variation of genic clusters. Comprehensive studies will be performed on the Fe-Si-B, Finemet and Fe-Cr-Mo-Mn-C-B-Y alloys in the following aspects. We will characterize the local ordering structures in the first place and then determine the genic clusters. The atomic packing, electronic and magnetic structures of genic clusters are experimentally measured and calculated. The elastic properties, yielding strength and toughness of amorphous alloys are correlated to the genic clusters. The structural evolution of genic clusters and the transformation mechanism from toughness to brittleness of amorphous alloys during the nanocrystallization are clarified. The active mechanism of trace elements and melt heat history on the reconstruction and modification of genic clusters are studied. And the key factors which improve the toughness of Fe-base amorphous and nanocrystalline alloys are determined. Based on the above studies, we expect that the theories and methods for the toughening of Fe-based amorphous and nanocrystalline alloys by the variation of genic clusters will be established. It is considered that this project is of significance in the development of new fracture theory and the exploration of novel technologies of Fe-based amorphous and nanocrystalline alloys.

Fe基非晶纳米晶合金普遍存在的大本征脆性已成为制约其使用性能、制造工艺和设备安全的瓶颈。本项目提出以基因性团簇变异增韧Fe基非晶纳米晶合金的学术思路，以Fe-Si-B、Finemet和Fe-Cr-Mn-Mo-C-B-Y合金为对象，研究非晶合金中局域有序结构，从各种短程序和中程序中确定出基因性团簇，精确测定和计算基因性团簇的原子排列、电子结构和磁畴结构，获得基因性团簇与非晶合金弹性、屈服强度和断裂韧性的关联性，研究纳米晶化过程中基因性团簇的结构演变和纳米晶合金韧脆转变机制。研究微量元素添加和熔体热历史在基因性团簇进行重构和改性的作用机制，找到Fe基非晶纳米晶合金增韧的关键影响因素。通过上述研究，建立基因性团簇变异增韧Fe基非晶纳米晶合金的理论和方法。项目的开展对于丰富非晶合金材料的断裂理论、探索制备非晶态合金新工艺新技术有重要理论和实际意义。

Fe基非晶纳米晶合金普遍存在的大本征脆性已成为制约其使用性能、制造工艺和设备安全的瓶颈。本项目提出以基因性团簇变异增韧Fe基非晶纳米晶合金的学术思路，以Fe-Si-B、Finemet和Fe-Cr-Mn-Mo-C-B-Y合金为对象，研究非晶合金中局域有序结构，从各种短程序和中程序中确定出基因性团簇，精确测定和计算基因性团簇的原子排列、电子结构和磁畴结构，获得基因性团簇与非晶合金弹性、屈服强度和断裂韧性的关联性，研究纳米晶化过程中基因性团簇的结构演变和纳米晶合金韧脆转变机制。研究微量元素添加和熔体热历史在基因性团簇进行重构和改性的作用机制，找到Fe基非晶纳米晶合金增韧的关键影响因素。通过上述研究，建立基因性团簇变异增韧Fe基非晶纳米晶合金的理论和方法。项目的开展对于丰富非晶合金材料的断裂理论、探索制备非晶态合金新工艺新技术有重要理论和实际意义。