The influence of temperature and storage time at RT on nucleation of the β" phase in a 6082 Al-Mg-Si alloy

被引：314

作者：

Marioara, CD

Andersen, SJ

Jansen, J

Zandbergen, HW

机构：

[1] Delft Univ Technol, Natl Ctr HREM, Mat Sci Lab, NL-2628 AL Delft, Netherlands

[2] SINTEF, Mat Technol, Dept Appl Phys, N-7465 Trondheim, Norway

[3] Univ Trondheim, TNU, Dept Phys, N-7491 Trondheim, Norway

来源：

ACTA MATERIALIA | 2003年 / 51卷 / 03期

关键词：

precipitation; annealing; transmission electron microscopy (TEM); aluminium; hardness;

D O I：

10.1016/S1359-6454(02)00470-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The age hardening process of a 6082 Al-Mg-Si alloy by isothermal ageing at 100, 125 and 150 degreesC for 0 to 40 days has been investigated by both conventional and high-resolution transmission electron microscopy. Changes in sizes and densities of the pre-beta" and beta" phases during ageing can explain the evolution of hardness, in particular a plateau in the curve of the hardness versus ageing time. Fully coherent pre-beta" particles (GP-1 zones) are formed from atomic clusters that were created upon annealing or at natural ageing. Room temperature (RT) storage reduces the number of pre-beta" particles by a factor of 5. Ageing at 125 and 150 degreesC causes the phase pre-beta" to transform to the phase beta". An ageing temperature of 100 degreesC was found to be too low to initiate the transformation of pre-beta" to beta". (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

引用

页码：789 / 796

页数：8

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