Formation and reversion of clusters during natural aging and subsequent artificial aging in an Al-Mg-Si alloy

被引:91
作者
Aruga, Yasuhiro [1 ]
Kozuka, Masaya [1 ]
Takaki, Yasuo [2 ]
Sato, Tatsuo [3 ]
机构
[1] Kobe Steel Ltd, Mat Res Lab, Nishi Ku, Kobe, Hyogo 6512271, Japan
[2] Kobe Steel Ltd, Aluminum Sheets & Coils Res Dept, Aluminum & Copper Business, Moka, Tochigi 3214367, Japan
[3] Tokyo Inst Technol, Precis & Intelligence Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2015年 / 631卷
关键词
Aluminum alloys; Aging; Hardening; Cluster; Atom probe; 3-DIMENSIONAL ATOM-PROBE; HARDENING RESPONSE; CU ALLOY; PRECIPITATION; BEHAVIOR; NANOCLUSTERS; SILICON; PHASE;
D O I
10.1016/j.msea.2015.02.035
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The continuous changes in number density, size distribution and chemical composition of clusters during natural aging (NA), and subsequent artificial aging (AA) at 443 K, in an Al-0.62Mg-0.93Si (mass%) alloy have been evaluated using atom probe tomography. The data show almost no change in the average size and Mg/Si ratio (at% ratio) of clusters during NA. The highest hardness and most-dense clusters, following NA, and the largest drop in hardness, during AA for 1.2 ks, are observed in the material with the longest NA period. In contrast with the published literature, which suggests that only small clusters revert into solution, the number density of clusters decreased, with no dependence on the cluster size, during AA for 1.2 ks, resulting in a slight decrease in the average radius of clusters. Things to be emphasized are that the number density of clusters with the Mg/Si ratio below 0.4 stays pretty much the same during AA, whereas other clusters decrease during the first 1.2 ks and then increase again during the prolonged AA for up to 3.6 ks. This work is the first to reveal that the typical Si-rich clusters can neither be dissolved nor grow further, although the size is small. In other words, it is believed that the typical Si-rich clusters can lead to the retardation of the hardness increase during AA called as negative effect of NA. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:86 / 96
页数:11
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