Influence of Mg and Li content on the microstructure evolution of Al-Cu-Li alloys during long-term ageing

被引：140
作者：
Deschamps, A. [1 ,2 ]
Garcia, M. [1 ,2 ,3 ]
Chevy, J. [3 ]
Davo, B. [3 ]
De Geuser, F. [1 ,2 ]
机构：
[1] Univ Grenoble Alpes, SIMAP, F-38000 Grenoble, France
[2] CNRS, SIMAP, F-38000 Grenoble, France
[3] Constellium Technol Ctr, CS 10027, F-38341 Voreppe, France
来源：
ACTA MATERIALIA | 2017年 / 122卷
关键词：
Al-Cu-Li alloys; Long term ageing; Precipitation; Microstructure; TRANSMISSION ELECTRON-MICROSCOPY; SMALL-ANGLE SCATTERING; FRICTION STIR WELDS; X-RAY-SCATTERING; MECHANICAL-PROPERTIES; T-1; PHASE; AG ALLOY; PRECIPITATION KINETICS; PLASTIC-DEFORMATION; ATOMIC-STRUCTURE;
D O I：
10.1016/j.actamat.2016.09.036
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The evolution of microstructure during long-term ageing (LTA) up to 3000 hat 85 degrees C following a T8 heat treatment has been characterised in three Al-Cu-Li-Mg alloys of variable Mg and Li content. A combination of transmission electron microscopy, differential scanning calorimetry and small-angle X-ray scattering has been used to evaluate the evolution of the different phases. In the T8 condition all three alloys contain a high density of T-1 precipitates together with S precipitates along the dislocations introduced by pre-stretching. In addition, the alloy with highest Li contains delta' precipitates. During LTA this last alloy experiences a significant complementary precipitation of delta'. The two other alloys experience a much more limited microstructure evolution, which appears to be linked to the formation and subsequent evolution of metastable phases (GP and GPB zones) in the regions between T-1 platelets. The evolution of the alloys' strength is shown to be well correlated to their microstructure. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：32 / 46
页数：15
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