Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5456234 | Materials Science and Engineering: A | 2017 | 9 Pages |
Abstract
The close association between the Ω 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 Ω phase is strongly dependent on Ag variations. Increasing the bulk Ag content favors a denser Ω 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 Ω precursors. This feature lowers its nucleation barrier and increases the nucleation rate of Ω phase, finally contributes to the enhanced Ω precipitation. Also, it is noted that increasing Ag remarkably restricts the precipitation of θ' phase.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Song Bai, Puyou Ying, Zhiyi Liu, Jian Wang, Junlin Li,