Evolution of nanostructure during the early stages of ageing in Al-Zn-Mg-Cu alloys

被引：13
作者：
Liddicoat, P. V. [1 ]
Honma, T.
Stephenson, L. T.
Ringer, S. P.
机构：
[1] Univ Sydney, Australian Key Ctr Microscopy & Microanal, Sydney, NSW 2006, Australia
[2] Univ Sydney, ARC Ctr Excellence Design Light Met, Sydney, NSW 2006, Australia
来源：
ALUMINIUM ALLOYS 2006, PTS 1 AND 2: RESEARCH THROUGH INNOVATION AND TECHNOLOGY | 2006年 / 519-521卷
关键词：
Al-Zn-Mg; Al-Zn-Mg-Cu; atom probe; aluminium alloys; age hardening; cluster hardening;
D O I：
10.4028/www.scientific.net/MSF.519-521.555
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
During age-hardening of certain Al-Zn-Mg-Cu alloys, a 90% hardness increase can occur with 75 seconds. The clustering and precipitation of solute element species during this early rapid hardening (RH) period has been investigated through atom probe tomography, transmission electron microscopy, and Vickers hardness measurements. This study has focussed on the effect of copper by analysing three alloys; Al-2.0Zn-1.8Mg-0.7Cu, Al-2.0Zn-1.7Mg-0.2Cu and Al-1.9Zn-1.7Mg (at.%). The early RH reaction in these alloys accounts for up to 70% of the total hardening (peak hardness minus as-quenched hardness) and takes place during the first 60 seconds of ageing. We report preferred solute-solute interactions in the as-quenched materials. This quenched-in nanostructure acts as a template for subsequent solute clustering, the nature of which we have correlated with ageing.
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页码：555 / 560
页数：6
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