title: High-resolution transmission electron microscopy study on reversion of Al2CuMg precipitates in Al-Cu-Mg alloys under irradiation.
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.
authors.affiliation: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; Liaoning Technical College of Equipment Manufacturing, Shenyang 110161, China.
authors.forename: Y L
authors.initials: YL
authors.lastname: Zhao
authors.affiliation: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
authors.forename: W W
authors.initials: WW
authors.lastname: Hu
authors.affiliation: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China. Electronic address: yangzq@imr.ac.cn.
authors.forename: Z Q
authors.initials: ZQ
authors.lastname: Yang
keywords: Al alloy; Irradiation; Precipitate; Quantitative HRTEM; Structural reversion