Zhao YL, Hu WW, Yang ZQ. High-resolution transmission electron microscopy study on reversion of Al2CuMg precipitates in Al-Cu-Mg alloys under irradiation.
Micron 2015;
76:1-5. [PMID:
26011813 DOI:
10.1016/j.micron.2015.05.009]
[Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Revised: 05/13/2015] [Accepted: 05/13/2015] [Indexed: 11/30/2022]
Abstract
Image deconvolution analyses showed that reversion of S-Al2CuMg precipitates occurred in an Al-Cu-Mg alloy during high-resolution transmission electron microscopy observations. A fraction of Mg and Cu atoms in the precipitates diffused into Al matrix due to electron beam irradiation at 300kV, resulting in structural/chemical reversion of the precipitates. The structural reversion of the S-Al2CuMg precipitates is closely related with irradiation-induced displacement of atoms. The strong attraction between Cu and Mg atoms might assist the sub-threshold displacement of Cu atoms. One transitional structure is determined to be S''-Al10Cu3Mg3, a precursor of S-Al2CuMg. Two other transitional structures, Al3CuMg and Al18Cu5Mg5 which have the same lattice parameters of a=c=0.405nm as that of S''-Al10Cu3Mg3, but different b values, are suggested.
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