Secondary ageing in an aluminium alloy 7050

被引：287

作者：

Buha, J. ^{[1
]}

Lumley, R. N. ^{[2
]}

Crosky, A. G. ^{[1
]}

机构：

[1] Univ New S Wales, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia

[2] CSIRO Light Met Flagship, Clayton, Vic 3169, Australia

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 492卷 / 1-2期

基金：

澳大利亚研究理事会;

关键词：

Al-Zn-Mg-Cu alloy; ageing; secondary precipitation; TEM; DSC;

D O I：

10.1016/j.msea.2008.02.039

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Secondary precipitation takes place in alloy 7050 at 65 degrees C after underageing at 130 degrees C and quenching (T614-65 temper) and results in a significantly increased number density of the eta' platelets, the precipitates also formed in the T6 temper. The modified microstructure results in tensile properties comparable to that of the T6 temper, but with significantly improved fracture toughness. A combined transmission electron microscopy (TEM) and differential scanning calorimetry (DSC) study has shown that secondary ageing at 65 degrees C results in evolution of the GPI zones formed during underageing into the eta' phase. Ageing at 65 degrees C alone results in the formation of GPII zones, which provide lesser strengthening than the eta' platelets. The DSC study revealed six exothermic reactions corresponding to the formation of six different types of precipitate during the DSC scan. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：1 / 10

页数：10

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