Abstract
The effect of high densities of dislocations on the formation behavior of two types of nano-scale clusters (nanoclusters), which are formed at room temperature or during pre-aging at ~373. K in an Al-Mg-Si alloy, was investigated by atom probe tomography. Cold rolling was applied to modify the formation behavior and/or the characteristics of the nanoclusters and also the precipitation sequence, which involve both nanoclusters and a strengthening phase to improve the bake-hardening response. Nanoclusters formed during pre-aging tended to form along the dislocations. Cold rolling accelerated the preferential formation of the nanoclusters, whereas the number density of the nanoclusters decreased by cold rolling before pre-aging. However, the number density of the nanoclusters was considerably higher than that of the Β″ phase. Cold rolling before pre-aging enhanced the age-hardenability the most compared with other processes such as the contemporary pre-aging process. It is considered that the nanoclusters along dislocations lead to the preferential transformation to the Β phase and then the rapid growth of the Β″ phase. The nanoclusters formed on dislocations are effective in improving the bake-hardening response for the duration of the bake-hardening process. The kinetics and the distribution of the nanoclusters were found to be affected by the dislocations which were induced by cold rolling.
| Original language | English |
|---|---|
| Pages (from-to) | 492-497 |
| Number of pages | 6 |
| Journal | Materials Science and Engineering A |
| Volume | 561 |
| DOIs | |
| Publication status | Published - 2013 Jan 20 |
| Externally published | Yes |
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Keywords
- Al-Mg-Si alloys
- Atom probe tomography
- Bake-hardening response
- Dislocation-nanocluster interaction
- Hardness measurement
- Nanocluster
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanical Engineering
- Mechanics of Materials
Cite this
Effect of cold rolling on the formation and distribution of nanoclusters during pre-aging in an Al-Mg-Si alloy. / Serizawa, Ai; Sato, T.; Miller, M. K.
In: Materials Science and Engineering A, Vol. 561, 20.01.2013, p. 492-497.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effect of cold rolling on the formation and distribution of nanoclusters during pre-aging in an Al-Mg-Si alloy
AU - Serizawa, Ai
AU - Sato, T.
AU - Miller, M. K.
PY - 2013/1/20
Y1 - 2013/1/20
N2 - The effect of high densities of dislocations on the formation behavior of two types of nano-scale clusters (nanoclusters), which are formed at room temperature or during pre-aging at ~373. K in an Al-Mg-Si alloy, was investigated by atom probe tomography. Cold rolling was applied to modify the formation behavior and/or the characteristics of the nanoclusters and also the precipitation sequence, which involve both nanoclusters and a strengthening phase to improve the bake-hardening response. Nanoclusters formed during pre-aging tended to form along the dislocations. Cold rolling accelerated the preferential formation of the nanoclusters, whereas the number density of the nanoclusters decreased by cold rolling before pre-aging. However, the number density of the nanoclusters was considerably higher than that of the Β″ phase. Cold rolling before pre-aging enhanced the age-hardenability the most compared with other processes such as the contemporary pre-aging process. It is considered that the nanoclusters along dislocations lead to the preferential transformation to the Β phase and then the rapid growth of the Β″ phase. The nanoclusters formed on dislocations are effective in improving the bake-hardening response for the duration of the bake-hardening process. The kinetics and the distribution of the nanoclusters were found to be affected by the dislocations which were induced by cold rolling.
AB - The effect of high densities of dislocations on the formation behavior of two types of nano-scale clusters (nanoclusters), which are formed at room temperature or during pre-aging at ~373. K in an Al-Mg-Si alloy, was investigated by atom probe tomography. Cold rolling was applied to modify the formation behavior and/or the characteristics of the nanoclusters and also the precipitation sequence, which involve both nanoclusters and a strengthening phase to improve the bake-hardening response. Nanoclusters formed during pre-aging tended to form along the dislocations. Cold rolling accelerated the preferential formation of the nanoclusters, whereas the number density of the nanoclusters decreased by cold rolling before pre-aging. However, the number density of the nanoclusters was considerably higher than that of the Β″ phase. Cold rolling before pre-aging enhanced the age-hardenability the most compared with other processes such as the contemporary pre-aging process. It is considered that the nanoclusters along dislocations lead to the preferential transformation to the Β phase and then the rapid growth of the Β″ phase. The nanoclusters formed on dislocations are effective in improving the bake-hardening response for the duration of the bake-hardening process. The kinetics and the distribution of the nanoclusters were found to be affected by the dislocations which were induced by cold rolling.
KW - Al-Mg-Si alloys
KW - Atom probe tomography
KW - Bake-hardening response
KW - Dislocation-nanocluster interaction
KW - Hardness measurement
KW - Nanocluster
UR - http://www.scopus.com/inward/record.url?scp=84873526084&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84873526084&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2012.10.070
DO - 10.1016/j.msea.2012.10.070
M3 - Article
VL - 561
SP - 492
EP - 497
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
ER -