Influence of Mg, Ag and Zn minor solute additions on the precipitation kinetics and strengthening of an Al-Cu-Li alloy

被引：161
作者：
Gumbmann, Eva [1 ,2 ,3 ]
De Geuser, Frederic [1 ]
Sigli, Christophe [2 ]
Deschamps, Alexis [1 ]
机构：
[1] Univ Grenoble Alpes, CNRS, SIMaP, Grenoble INP,Inst Engn, F-38000 Grenoble, France
[2] Constellium Technol Ctr, CS 10027, F-38341 Voreppe, France
[3] Hydro Aluminium Rolled Prod AS, Weidemanns Gate 8, N-3080 Holmestrand, Norway
来源：
ACTA MATERIALIA | 2017年 / 133卷
关键词：
Precipitation kinetics; Precipitation strengthening; Al-Cu-Li alloys; DSC; SAXS; TRANSMISSION ELECTRON-MICROSCOPY; ANGLE X-RAY; MECHANICAL-PROPERTIES; PLASTIC-DEFORMATION; ALUMINUM-ALLOYS; T-1; PHASE; MICROSTRUCTURE; SCATTERING; EVOLUTION; AL2CULI;
D O I：
10.1016/j.actamat.2017.05.029
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The influence of minor solute additions of Mg, Ag and Zn and their combinations on the precipitation kinetics and strengthening of an Al-Cu-Li alloy has been systematically investigated. Combining differential scanning calorimetry (DSC) and small-angle X-ray scattering (SAXS) provides information on how alloy chemistry changes the precipitation sequence, the precipitation kinetics in non isothermal and in isothermal conditions, and the related strengthening. When adding Mg, the precipitation kinetics are strongly accelerated, which is shown to be related to the dominant formation of T-1 precipitates. When adding Ag and Zn together with Mg, further enhancement of precipitation kinetics is observed, without change of the precipitation sequence, probably due to a more efficient nucleation of T-1. The intrinsic strengthening potential of the T-1 phase is shown to be unchanged by the addition of Ag and Zn, and the higher strength reached in the alloys containing these additions is shown to be due to a higher precipitate volume fraction. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：172 / 185
页数：14
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