title: The phase transition in annealed mechanically alloyed Fe - Cu.
abstract: 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.
authors.affiliation: 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.
authors.forename: L
authors.initials: L
authors.lastname: Yu-Zhi
authors.forename: L
authors.initials: L
authors.lastname: Tie
authors.forename: Z
authors.initials: Z
authors.lastname: Yu-Heng
authors.forename: W
authors.initials: W
authors.lastname: Li-Wen
authors.forename: G
authors.initials: G
authors.lastname: Chen
authors.forename: L
authors.initials: L
authors.lastname: Wen-Han