论文部分内容阅读
近年来,具有纳米级晶粒尺寸的多晶材料的研究引起了人们极大的兴趣。很重要的原因是晶界已成为该材料中一项不可乎略的组元。这些材料中大量晶界的存在导致许多与微结构特性有关的性能发生变化,如反常Hall-Petch关系的发现。Lu等提出了利用非晶晶化法制备大块纳米晶合金,即通过控制热处理工艺使非晶条带、丝或粉晶化成具有一定晶粒尺寸的纳米晶材料,为直接生产大块纳米晶合金提供了可能性。本文利用该方法成功地制备了晶粒尺寸在15-250nm范围内的Fe-TM-Si-B(TM-Cu,Mo)多晶合金,并研究了显微硬度
In recent years, the research of polycrystalline materials with nano-scale grain size has aroused great interest. A very important reason is that grain boundaries have become an indispensable component of this material. The presence of a large number of grain boundaries in these materials has led to many changes in the properties associated with microstructural properties, such as the discovery of the anomalous Hall-Petch relationship. Lu et al proposed the use of amorphous crystallization of large nanocrystalline alloys, that is, by controlling the heat treatment process to amorphous ribbons, filaments or powder into a certain size of the nanocrystalline grain size material for the direct production of bulk nanocrystalline Alloy offers the possibility. In this paper, Fe-TM-Si-B (TM-Cu, Mo) polycrystalline alloy with grain size in the range of 15-250nm has been successfully prepared by this method. The microhardness