Effect of the ageing on precipitation spatial distribution in stationary shoulder friction stir welded AA2050 alloys

被引：17

作者：

Avettand-Fenoel, M. -N. ^{[1
]}

De Geuser, F. ^{[2
]}

Deschamps, A. ^{[2
]}

机构：

[1] Univ Lille, CNRS, UMR 8207, INRA,ENSCL,UMET,Unite Mat & Transformat, F-59000 Lille, France

[2] Univ Grenoble Alpes, SIMAP, F-38402 St Martin Dheres, France

来源：

MATERIALS CHARACTERIZATION | 2019年 / 154卷

关键词：

Stationary shoulder friction stir welding; AA2050; alloy; Ageing; Microstructure; SAXS analyses; Microhardness; AL-LI-CU; MECHANICAL-PROPERTIES; RESIDUAL-STRESS; HEAT-TREATMENT; CORROSION BEHAVIOR; MICROSTRUCTURE; DEFORMATION; PARAMETERS; EVOLUTION; KINETICS;

D O I：

10.1016/j.matchar.2019.06.006

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The spatial distribution of the strengthening precipitates in stationary shoulder friction stir welds (SSFSW) of the AA2050 Al-Cu-Li alloy has been characterized by small-angle X-ray scattering (SAXS), combined with microhardness mapping and transmission electron microscopy (TEM). It is shown that welding the alloy before ageing (T3WT8) leads to a more homogeneous distribution of precipitates along the weld zones than welding after ageing (T8W). Further in-situ SAXS ageing (24 h at 155 degrees C) has been performed on the nuggets of both welds, to better evaluate the subsequent precipitate evolution. The nugget zone is shown to be very inhomogeneous, which can be explained by the 2 passes sequence of SSFSW. The mid-depth zone shows no fine precipitation, because of the formation of coarser phase consuming the solutes. Irrespective of the welding sequence, further ageing does not yield homogeneous precipitation in the welds.

引用

页码：193 / 199

页数：7

共 55 条

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