Vacancy Behavior and Solute Cluster Growth During Natural Aging of an Al-Mg-Si Alloy

被引：0
|
作者：
M. D. H. Lay
H. S. Zurob
C. R. Hutchinson
T. J. Bastow
A. J. Hill
机构：
[1] CSIRO Process Science and Engineering,Department of Materials Science and Engineering
[2] McMaster University,Department of Materials Engineering
[3] Monash University,undefined
[4] CSIRO Materials Science and Engineering,undefined
来源：
Metallurgical and Materials Transactions A | 2012年 / 43卷
关键词：
Nuclear Magnetic Resonance; Solute Atom; Natural Aging; Solute Cluster; Artificial Aging;
D O I：
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中图分类号：
学科分类号：
摘要：
The natural aging behavior of an Al-0.46Mg-1.05Si-0.14Fe (wt pct) alloy was studied with positron annihilation lifetime spectroscopy at four temperatures and with 25Mg solid-state nuclear magnetic resonance. The evolution of positron lifetime is shown to consist of three distinct stages. In an effort to understand the physical processes occurring during natural aging, a phenomenological model was developed for the first two stages and is shown to describe the experimental observations well. The description accounts for the decay in positron lifetime due to diffusion of vacancies to sinks and an increase in positron lifetime attributed to growing solute clusters. NMR measurements of 25Mg solute partitioning during natural aging support the model.
引用
收藏
页码：4507 / 4513
页数：6
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