论文部分内容阅读
用机械合金化方法，在不互溶的Fe－Cu二元系的富Fe端和富Cu端，分别制备出bcc和fcc结构的纳米晶过饱和固溶体，用X射线衍射和显微硬度分析等方法，系统研究了晶粒尺寸、溶质原子含量等因素对Fe－Cu纳米晶过饱和固溶体硬度的影响，结果表明，在富Cu端形成的fcc纳米晶过饱和固溶体的硬度，随溶质原子Fe含量的增加而升高，而在富Fe端形成的bcc纳米晶过饱和固溶体的硬度，随溶质原子Cu含量的增加而下降，根据纳米晶过饱和固溶体的结构特点，初步认为上述强化和软化可能是由于晶内和晶界发生了强化和软化所致。
Nanocrystalline supersaturated solid solution with bcc and fcc structure was prepared by mechanical alloying method on the Fe-rich and Cu-enriched ends of the immiscible Fe-Cu binary system. By X-ray diffraction and microhardness analysis , The effect of the grain size, solute atomic content and other factors on the hardness of supersaturated solid solutions of Fe-Cu nanocrystals was systematically investigated. The results show that the hardness of the supersaturated solid solution of fcc nanocrystals formed on the Cu- And the hardness of supersaturated solid solution of bcc nanocrystal formed on the Fe-rich end decreases with the increase of the Cu content of the solute atom. According to the structural characteristics of nanocrystalline supersaturated solid solution, the above-mentioned strengthening and softening may be presumed to be due to Crystal and grain boundaries have been strengthened and softened.