Clustering behaviour in an Al-Mg-Si-Cu alloy during natural ageing and subsequent under-ageing

被引:89
作者
Cao, Lingfei [1 ]
Rometsch, Paul A. [1 ]
Couper, Malcolm J. [1 ]
机构
[1] Monash Univ, ARC Ctr Excellence Design Light Met, Clayton, Vic 3800, Australia
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2013年 / 559卷
关键词
6xxx alloy; 3DAP; Clustering; Natural ageing; Early-stage artificial ageing; 3-DIMENSIONAL ATOM-PROBE; PRECIPITATION;
D O I
10.1016/j.msea.2012.08.093
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The clustering behaviour in an Al-Mg-Si-Cu alloy in the T4 and T61 tempers has been investigated by hardness and electrical conductivity testing, along with nanostructural characterisation using 3-D atom probe (3DAP) analysis. The selection of parameters for the PoSAP and IVAS cluster analysis software tools is discussed. The results show that the T4 hardness increases significantly within one day of natural ageing, and then reaches a plateau after about a week. A contingency table analysis reveals that clustering between Mg and Si atoms already exists in the T4 condition with only 1.1 h of natural ageing. In the 161 condition (after 0.5 h at 170 degrees C), the hardness is greatest in samples aged immediately after quenching, and decreases very rapidly with increasing prior natural ageing times of up to 3 h. The initial hardness drop in the T61 condition is associated with decreases in the volume fraction, average size and maximum size of solute aggregates. Longer prior natural ageing times inhibit the formation of larger solute aggregates (with more than 75 detected Mg+Si+Cu atoms) and thus result in low levels of T61 hardness. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:257 / 261
页数:5
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