Precipitates, zones and transitions during aging of Al-Zn-Mg-Zr7000series alloy

被引：66

作者：

Hansen, V

Karlsen, OB

Langsrud, Y

Gjonnes, J

机构：

[1] Stavanger Univ Coll, Dept Technol & Nat Sci, N-4068 Stavanger, Norway

[2] Univ Oslo, Dept Chem, N-0315 Oslo, Norway

[3] Hydro Aluminium Struct, N-2831 Raufoss, Norway

[4] Univ Oslo, Ctr Mat Sci, N-0349 Oslo, Norway

来源：

MATERIALS SCIENCE AND TECHNOLOGY | 2004年 / 20卷 / 02期

关键词：

aluminium alloys; transmission electron microscopy; GP zones; age hardening precipitates; TTT diagram;

D O I：

10.1179/026708304225010424

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Age hardening of an industrial 7000 series alloy in the temperature range 70-150degreesC has been followed by mechanical testing, electrical conductivity measurement, differential scanning calorimetry and extensive electron microscopy (TEM). The property changes during aging are interpreted in terms of structural transformations that involve two types of Guinier-Preston (GP) zones (I and II), the metastable hardening precipitate eta' and the stable phase eta-MgZn2, as well as coarsening, changes of composition and internal order within zones and precipitates. Time-temperature ranges of the transformations during aging, and its dependence on quenching temperature, are estimated from TEM observations. The role of the GP(II) zones in the aging of alloys quenched from temperatures above 450degreesC is emphasized.

引用

页码：185 / 193

页数：9

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