Yu-Zhi L, Tie L, Yu-Heng Z, Li-Wen W, Chen G, Wen-Han L
Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, People's Republic of China. Centre for Advanced Studies in Science and Technology of Microstructures, Nanjing 210093, People's Republic of China.
J Phys Condens Matter. 1996 Sep 16;8(38):7191-7. doi: 10.1088/0953-8984/8/38/020.
Using Mössbauer spectra and x-ray diffraction patterns, annealed mechanically alloyed Fe - Cu has been investigated in this paper. It is found that in [Formula: see text], after it has been milled, fcc-Cu has transformed into bcc-Cu, and some Cu atoms have diffused into the Fe. After the alloy has subsequently been annealed, it is found that bcc-Cu has transformed back into fcc-Cu, while the Cu atoms in the Fe have been separated. In [Formula: see text], after being milled, an fcc-Fe-rich phase has been formed, and after the alloy has subsequently been annealed, this has transformed back to bcc-Fe. The shorter the milling time and the higher the annealing temperature, the faster the transformation. In [Formula: see text], after it has been annealed, the fcc-Fe-rich phase has transformed to bcc-Fe also, and the fcc-Cu-rich phase remains when the annealing temperature increases. All of these results show that the fcc-Fe-rich phase in the milled samples is a metastable phase - it will transform to stable bcc-Fe when it is annealed - while the long-milling-product fcc-Cu-rich phase is a stable phase.
本文利用穆斯堡尔谱和X射线衍射图谱对经退火处理的机械合金化Fe-Cu进行了研究。研究发现，在[化学式：见原文]中，球磨后，面心立方结构的Cu已转变为体心立方结构的Cu，且部分Cu原子扩散到了Fe中。随后对该合金进行退火处理后发现，体心立方结构的Cu又变回了面心立方结构的Cu，而Fe中的Cu原子已分离。在[化学式：见原文]中，球磨后形成了富面心立方结构的Fe相，随后对该合金进行退火处理后，此相又转变回了体心立方结构的Fe。球磨时间越短且退火温度越高，转变速度越快。在[化学式：见原文]中，退火后，富面心立方结构的Fe相也转变为了体心立方结构的Fe，且随着退火温度升高，富面心立方结构的Cu相依然存在。所有这些结果表明，球磨样品中的富面心立方结构的Fe相是亚稳相——退火时会转变为稳定的体心立方结构的Fe——而长时间球磨产物富面心立方结构的Cu相是稳定相。
