Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 795, Issue -, Pages 8-18Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.04.260
Keywords
Hypereutectic Al-Si alloy; Selective laser melting; Thermal expansion; Microstructure
Categories
Funding
- Seventh European Frame Programme FP7 grant AMAZE Additive Manufacturing Aiming towards Zero Waste and Efficient Production of High-Tech Metal Products FP7 Grant [NMPSE-2012-0313781]
- Thales-Alenia as a part of AMAZE
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Selective Laser Melting (SLM) was investigated as new processing route for strongly hypereutectic AlSi alloys for thermal management applications in space industry. Processing conditions, microstructure and thermal expansion behavior were analyzed for AlSi10Mg + Si alloys with 25 wt% and 50 wt% Si fabricated by in-situ SLM of powder mixtures. For both Si compositions parts with densities >= 99% could be achieved using laser power >= 275 W and scan speeds >= 1500 mm/s for the alloy containing 25 wt% Si and laser power of 400 W and scan speeds >= 1500 mm/s for the alloy containing 50 wt% Si. Considerable refinement of primary and eutectic Si was achieved for both Si compositions due to the high cooling rates of SLM. The mean particle size for the coarse primary Si of the 50 wt% Si containing alloy was below 10 mu m. Additionally, unmolten Si powder particles were observed. Measurements of the coefficient of thermal expansion (CTE) showed the tailorability of CTE with adjustment of Si content. A decrease in CTE of 43% compared to pure Al was achieved at a total Si content of 50 wt%. Experimental data was close to model calculations based on the rule of mixture and the Turner model depending on the different microstructures of the two alloy compositions. (C) 2019 Elsevier B.V. All rights reserved.
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