Clustering behavior during natural aging and artificial aging in Al-Mg-Si alloys with different Ag and Cu addition

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:732

Article

Weng, Yaoyao¹  Jia, Zhihong^1,2  Ding, Lipeng^3,4  Muraishi, Shinji⁵  Liu, Qing¹ 

[1] Chongqing Univ, Coll Mat Sci & Engn, Minist Educ, Int Joint Lab Light Alloys, Chongqing 400044, Peoples R China

[2] Chongqing Univ, Electron Microscopy Ctr, Chongqing 400044, Peoples R China

[3] Catholic Univ Louvain, Inst Mech Mat & Civil Engn, IMAP, B-1348 Louvain La Neuve, Belgium

[4] Univ Antwerp, Dept Phys, Electron Microscopy Mat Sci EMAT, Groenenborgerlaan 171, B-2020 Antwerp, Belgium

[5] Tokyo Inst Technol, Dept Mat Sci & Engn, Meguro Ku, 2-12-1-S8-5 Ookayama, Tokyo 1528552, Japan

关键词: Al-Mg-Si alloys;    Ag addition;    Cu addition;    Clustering behavior;    Atom probe tomography;   

DOI  :  10.1016/j.msea.2018.07.018

来源: Elsevier

【 摘 要 】

The effect of Ag and Cu addition on clustering behavior of Al-Mg-Si alloys during natural aging (NA) and artificial aging (AA) was investigated by hardness measurement, tensile test and atom probe tomography analysis. The results show that both Ag and Cu atoms could enter clusters and GP-zones, change the Mg/Si ratio and increase their volume fractions. Compared with the Al base alloy, the clusters in the Ag/Cu-added alloys more easily transform to beta phases for size and compositional similarity, and the strengthening ability of these particles is enhanced by the increased volume fraction and shear modulus. In NA condition, Cu is greater in improving the volume fraction of clusters than Ag and thus produces higher T4 temper hardness. In AA condition, in contrary, Ag is more effective in facilitating the formation and growth of particles than Cu due to the stronger Ag-Mg interaction and the high diffusivity of Ag atoms in Al matrix, leading to highest hardening response. Compared to the Cu-added alloy, the Ag-added alloy shows higher precipitation kinetics during AA treatment and maintains a lower T4 temper hardness.

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