Atomic-scale structural evolution in amorphous Nd9Fe85B6 subjected to severe plastic deformation at room temperature
Atomic-scale structural evolution in amorphous Nd9Fe85B6 subjected to severe plastic deformation at room temperature
复制标题
DOI：
10.1063/1.3152013
复制
发表时间：
2009-06
影响因子：
4
通讯作者：
Wei Li;Xiaohong Li;D. Guo;Kiminori Sato;D. Gunderov;V. Stolyarov;Xiangyi Zhang
中科院分区：
文献类型：
--
作者：
Wei Li;Xiaohong Li;D. Guo;Kiminori Sato;D. Gunderov;V. Stolyarov;Xiangyi Zhang
了解非晶合金在室温下的变形诱导纳米化是一个巨大的挑战。在本研究中，通过正电子寿命测量和正电子湮灭光子的同步多普勒展宽测量，直接证明了非晶态Nd9Fe85B6在室温高压扭转变形下形成了被铁原子丰富包围的空位型缺陷。这为剪切诱导形变非晶合金中铁原子富集提供了直接的实验证据。这些结果对于理解纳米材料的变形致晶化和纳米材料的技术发展具有重要意义。
Understanding the deformation-induced nanocrystallization in amorphous alloys at room temperature is proved to be a great challenge. In the present study, the formation of vacancy-type defects richly surrounded with Fe atoms in amorphous Nd9Fe85B6 subjected to room-temperature high-pressure torsion deformation is directly evidenced by positron lifetime measurements combined with a coincident Doppler broadening measurement of the positron-electron annihilation photons. This demonstrates a direct experimental evidence for shear inducing the enrichment of Fe atoms in the deformed amorphous alloy. These results presented here are of importance for understanding the deformation-induced nanocrystallization and for the technique development of nanocrystalline materials.