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

被引：46
|
作者：
Lay, M. D. H. [1 ]
Zurob, H. S. [2 ]
Hutchinson, C. R. [3 ]
Bastow, T. J. [4 ]
Hill, A. J. [1 ]
机构：
[1] CSIRO Proc Sci & Engn, Clayton, Vic 3168, Australia
[2] McMaster Univ, Dept Mat Sci & Engn, Hamilton, ON L8S 4L7, Canada
[3] Monash Univ, Dept Mat Engn, Clayton, Vic 3800, Australia
[4] CSIRO Mat Sci & Engn, Clayton, Vic 3168, Australia
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2012年 / 43A卷 / 12期
基金：
澳大利亚研究理事会;
关键词：
POSITRON-ANNIHILATION; AT.PERCENT CU; ATOM-PROBE; PRECIPITATION; MECHANISMS; EVOLUTION; DIFFUSION; KINETICS; LIFETIME; METALS;
D O I：
10.1007/s11661-012-1257-7
中图分类号：
T [工业技术];
学科分类号：
08 ;
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 Mg-25 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 Mg-25 solute partitioning during natural aging support the model.
引用
收藏
页码：4507 / 4513
页数：7
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