期刊
SCRIPTA MATERIALIA
卷 160, 期 -, 页码 66-69出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2018.09.045
关键词
Selective laser melting; Al alloys; Residual stress; Precipitation; TEM
类别
资金
- Monash University (Australia)
- Australia Research Council (ARC) [IH130100008]
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 beta (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. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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