Abstract
The ageing responses of selective laser melted Al-7Si-0.6Mg alloy with different solid solution treatment times are investigated in this work. Silicon particles with random crystallographic orientations are the dominant precipitates at the direct aged condition. With 1 or 8 h solid solution treatment, the precipitation sequence resembles that of cast/wrought Al-Si-Mg alloys. However, the main precipitates at the peak-aged condition are different and are premature B′ (1 h) and β″ (8 h), respectively. These unusual precipitation pathways are attributed to the uniaxial strains in the Al matrix, suggesting new heat treatment procedures required for selective laser melted alloys.
| Language | English |
|---|---|
| Pages | 66-69 |
| Number of pages | 4 |
| Journal | Scripta Materialia |
| Volume | 160 |
| DOIs | |
| Publication status | Published - 1 Feb 2019 |
Keywords
- Al alloys
- Precipitation
- Residual stress
- Selective laser melting
- TEM
Cite this
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Multiple precipitation pathways in an Al-7Si-0.6Mg alloy fabricated by selective laser melting. / Rao, Jeremy H.; Zhang, Yong; Zhang, Kai; Huang, Aijun; Davies, Chris H. J.; Wu, Xinhua.
In: Scripta Materialia, Vol. 160, 01.02.2019, p. 66-69.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
T1 - Multiple precipitation pathways in an Al-7Si-0.6Mg alloy fabricated by selective laser melting
AU - Rao, Jeremy H.
AU - Zhang, Yong
AU - Zhang, Kai
AU - Huang, Aijun
AU - Davies, Chris H. J.
AU - Wu, Xinhua
PY - 2019/2/1
Y1 - 2019/2/1
N2 - The ageing responses of selective laser melted Al-7Si-0.6Mg alloy with different solid solution treatment times are investigated in this work. Silicon particles with random crystallographic orientations are the dominant precipitates at the direct aged condition. With 1 or 8 h solid solution treatment, the precipitation sequence resembles that of cast/wrought Al-Si-Mg alloys. However, the main precipitates at the peak-aged condition are different and are premature B′ (1 h) and β″ (8 h), respectively. These unusual precipitation pathways are attributed to the uniaxial strains in the Al matrix, suggesting new heat treatment procedures required for selective laser melted alloys.
AB - The ageing responses of selective laser melted Al-7Si-0.6Mg alloy with different solid solution treatment times are investigated in this work. Silicon particles with random crystallographic orientations are the dominant precipitates at the direct aged condition. With 1 or 8 h solid solution treatment, the precipitation sequence resembles that of cast/wrought Al-Si-Mg alloys. However, the main precipitates at the peak-aged condition are different and are premature B′ (1 h) and β″ (8 h), respectively. These unusual precipitation pathways are attributed to the uniaxial strains in the Al matrix, suggesting new heat treatment procedures required for selective laser melted alloys.
KW - Al alloys
KW - Precipitation
KW - Residual stress
KW - Selective laser melting
KW - TEM
UR - http://www.scopus.com/inward/record.url?scp=85054177777&partnerID=8YFLogxK
U2 - 10.1016/j.scriptamat.2018.09.045
DO - 10.1016/j.scriptamat.2018.09.045
M3 - Article
VL - 160
SP - 66
EP - 69
JO - Scripta Materialia
T2 - Scripta Materialia
JF - Scripta Materialia
SN - 1359-6462
ER -