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.
Original language | English |
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Pages (from-to) | 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
Equipment
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Centre for Additive Manufacturing (MCAM)
Aijun Huang (Manager)
Office of the Vice-Provost (Research and Research Infrastructure)Facility/equipment: Facility
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Centre for Electron Microscopy (MCEM)
Peter Miller (Manager)
Office of the Vice-Provost (Research and Research Infrastructure)Facility/equipment: Facility