Quantitative transmission electron microscopy and atom probe tomography study of Ag-dependent precipitation of Ω phase in Al-Cu-Mg alloys

被引：50
作者：
Bai, Song [1 ,2 ]
Ying, Puyou [1 ,2 ]
Liu, Zhiyi [1 ,2 ]
Wang, Jian [1 ,2 ]
Li, Junlin [1 ,2 ]
机构：
[1] Cent S Univ, Minist Educ, Key Lab Nonferrous Met Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
[2] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2017年 / 687卷
关键词：
Transmission electron microscopy; Atom probe tomography; Precipitation; Aging; Omega phase; Al-Cu-Mg-Ag alloys; MICROSTRUCTURAL EVOLUTION; MECHANICAL-PROPERTIES; AL-CU-MG-(AG) ALLOYS; ADDITIONS; NUCLEATION; BEHAVIOR; SI; TEMPERATURES; STABILITY;
D O I：
10.1016/j.msea.2017.01.045
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The close association between the Omega precipitation and various Ag additions is systematically investigated by quantitative transmission electron microscopy and atom probe tomography analysis. Our results suggest that the precipitation of Omega phase is strongly dependent on Ag variations. Increasing the bulk Ag content favors a denser Omega precipitation and hence leads to a greater age-hardening response of Al-Cu-Mg-Ag alloy. This phenomenon, as proposed by proximity histograms, is directly related to the greater abundance of Ag solutes within Omega precursors. This feature lowers its nucleation barrier and increases the nucleation rate of Omega phase, finally contributes to the enhanced Omega precipitation. Also, it is noted that increasing Ag remarkably restricts the precipitation of theta' phase.
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页码：8 / 16
页数：9
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