On the precipitation-hardening behavior of the Al−Mg−Si−Cu alloy AA6111

被引：1
|
作者：
S. Esmaeili
X. Wang
D. J. Lloyd
W. J. Poole
机构：
[1] Alcan International Limited,Kingston Research and Development Centre
[2] McMaster University,Department of Materials Science and Engineering
[3] University of British Columbia,Department of Metals and Materials Engineering
来源：
Metallurgical and Materials Transactions A | 2003年 / 34卷
关键词：
Differential Scanning Calorimetry; Material Transaction; Artificial Aging; Aged Material; Differential Scanning Calorimetry Trace;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The precipitation-hardening behavior of aluminum alloy AA6111 during artificial aging and the influence of prior natural aging on the aging behavior were investigated. The evolution of microstructure was studied using quantitative transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). The evolution of the relative volume fraction of precipitates for the solution-treated alloy was determined using isothermal calorimetry and a new analysis based on the DSC technique. Quantitative TEM was also used to obtain the rate of precipitation of microscopically resolvable phases during aging at 180 °C. Three types of precipitates, i.e., unresolved Guinier-Preston (GP) zones, β″, and Q′, were found to form during aging at 180 °C. The evolution of yield strength was related to the evolution of microstructure. It was found that the high hardening rate during artificial aging for the solution-treated alloy is due to the rapid precipitation of the β″ phase. Natural aging prior to artificial aging was found to decrease the rate of precipitation of β″. The slow hardening rate for the naturally aged alloy was attributed to the slower nucleation and growth of β″ phase.
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页码：751 / 763
页数：12
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