Atom probe tomography of nanoscale microstructures within precipitate free zones in Al-Zn-Mg(-Ag) alloys

被引：87

作者：

Ogura, Tomo ^{[1
]}

Hirosawa, Shoichi ^{[2
]}

Cerezo, Alfred ^{[3
]}

Sato, Tatsuo ^{[1
]}

机构：

[1] Tokyo Inst Technol, Dept Met & Ceram Sci, Meguro Ku, Tokyo 1528552, Japan

[2] Yokohama Natl Univ, Dept Mech Engn & Mat Sci, Hodogaya Ku, Yokohama, Kanagawa 2408501, Japan

[3] Univ Oxford, Dept Mat, Oxford OX1 3PH, England

来源：

ACTA MATERIALIA | 2010年 / 58卷 / 17期

关键词：

Precipitate free zones; Three-dimensional atom probe; Aluminum alloys; Transmission electron microscopy; MG-AG ALLOY; AL-ZN; MICROALLOYING ELEMENTS; AGEING CHARACTERISTICS; GRAIN-BOUNDARIES; NUCLEATION; STAGE; ENERGIES; SILVER; PHASE;

D O I：

10.1016/j.actamat.2010.06.046

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Solute distributions in the vicinity of grain boundaries in Al-Zn-Mg(-Ag) alloys were studied using a three-dimensional atom probe, in order to elucidate the mechanism of formation of precipitate free zones (PFZs) and the fundamental role of Ag in controlling PFZ width. It is shown that nanoscale clusters are formed within the PFZ in Al-Zn-Mg, despite the solute concentration remaining at the levels in the as-quenched state. Such observations have not previously been possible, and show unambiguously that vacancy depletion is the dominant mechanism of formation of PFZs in this alloy. In the Ag-containing alloy, a narrower PFZ is observed, with a reduced solute level, showing that here the dominant mechanism of PFZ formation is solute depletion. The role of Ag in this change of mechanism appears to be due to its favorable interactions not only with Mg and Zn atoms but also with vacancies. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：5714 / 5723

页数：10

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