Journal
ACTA MATERIALIA
Volume 129, Issue -, Pages 183-193Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2017.02.062
Keywords
Additive manufacturing; Selective laser melting; Aluminium alloys; Metal matrix composites; Mechanical properties
Funding
- Flemish Agency for Innovation by Science and Technology (IWT) Strategic Basic Research (SBO) project MultiMet
- Conseil Regional du Nord-Pas de Calais
- European Regional Development Fund (ERDF)
- National Natural Science Foundation of China [51201099]
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An in-situ nano-TiB2 decorated AlSi10Mg composite (NTD-Al) powder was fabricated by gas-atomisation for selective laser melting (SLM). Fully dense and crack-free NTD-Al samples were produced using SLM. In contrast to the NTD-Al powder without cell-like microstructure, the SLMed NTD-Al had a textureless microstructure, consisting of fine grains and cells, with well dispersed nano-TiB2 particles inside the grains and rod-like nano-Si precipitates inside the cells. Both nano-TiB2 particles and nano-Si precipitates exhibited a highly coherent interface with the Al matrix, indicative of a strong interfacial bonding. The formation of this microstructure was attributed to the sequential solidification of non-equilibrium and eutectic Al-Si upon rapid cooling during SLM. As a result, the SLMed NTD-Al showed a very high ultimate tensile strength similar to 530 MPa, excellent ductility similar to 15.5% and high microhardness similar to 191 HV0.3, which were higher than most conventionally fabricated wrought and tempered Al alloys, previously SLMed Al-Si alloys and nano-grained 7075 Al. The underlying mechanisms for this strength and ductility enhancement were discussed and a correlation between this novel microstructure and the superior mechanical properties was established. This study provides new and deep insights into the fabrication of metal matrix nanocomposites by SLM from in-situ pre-decorated composite powder. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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