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Metastable phases in vapour‐quenched Al 78 Cu 22 film
Author(s) -
Yan Haibo,
Gan Fuxi,
Wang Lixin
Publication year - 1993
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.19935050302
Subject(s) - metastability , materials science , amorphous solid , crystallite , crystallization , annealing (glass) , transmission electron microscopy , phase transition , alloy , condensed matter physics , crystallography , chemical physics , phase (matter) , lattice (music) , thermodynamics , nanotechnology , metallurgy , chemistry , physics , organic chemistry , acoustics
The structure and structural changes of an Al 78 Cu 22 (at%) alloy film produced by coevaporation onto a cooled substrate have been investigated with transmission electron microscopy. A series of metastable phase transitions were observed during the crystallization from the as‐deposited amorphous phase to the final equilibrium state. The deposit structure at room temperature consists of a mixture of fine grained α' crystallites (fcc, α = 4.81 Å) with an amorphous phase, and some welldefined crystals with an fcc lattice ( a = 7.18 Å, namely α 1 ). The subsequent annealing led to the grown crystals transforming to an ordered α′ phase. It is argued that the development of such a transition is the result of a gradual atomic rearrangement – first topologically then a chemically predominant disorder‐order transition.