Metall. Res. Technol.
Volume 112, Number 6, 2015
|Number of page(s)||23|
|Published online||05 November 2015|
Application study of AlSi10Mg alloy by selective laser melting: physical and mechanical properties, microstructure, heat treatments and manufacturing of aluminium metallic matrix composite (MMC)
CETIM CERTEC (CRAl: centre de référence de l’aluminium, Pole matériaux et procédés), 9 Boulevard Lahitolle, 18000 Bourges, France
Received: 9 March 2015
Accepted: 24 September 2015
Samples of AlSi10Mg alloy were first constructed, selecting the manufacturing parameters through a parametric method based on an experimental design; with the same technique, samples of a metallic matrix composite (AlSi10Mg matrix base and particles of SiC reinforcements) were also made. The evolution of the density with the introduction of reinforcements into the AlSi10Mg alloy was studied. This showed an increase in the porosity level with the reinforcement volume fraction. The material hardness and electrical conductivity were then evaluated, along with conventional mechanical characteristics, and microstructural changes with respect to heat treatments on both the AlSi10Mg alloy material and AlSi10Mg matrix composite. Doing so allows correlating material hardness and electrical conductivity (as observed for conventionally produced alloys: casting or wrought). The tensile strength, yield strength and Young’s modulus were measured. A significant increase in the conventional mechanical characteristics compared with casting was shown, due to hardening by structure refinement. Evidence is given to relate the yield strength value to the reduction in the dendrite arm spacing (DAS) by application of the Hall-Petch law. We discuss the understanding of the thermal process involved (temperature distribution and fast cooling rate). In addition, observations and analysis of the microstructural changes are presented: building tracks, the disturbed zone, and structural variations linked to heat treatment.
Key words: Selective laser melting / AlSi10Mg / MMC / SiC / microstructure / heat treatments / physical and mechanical properties
© EDP Sciences 2015
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