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Metals 2014, 4(1), 28-36; doi:10.3390/met4010028

Influence of Annealing on Mechanical Properties of Al-20Si Processed by Selective Laser Melting

1
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
2
IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany
3
TU Dresden, Institut für Werkstoffwissenschaft, D-01062 Dresden, Germany
*
Authors to whom correspondence should be addressed.
Received: 17 December 2013 / Revised: 12 January 2014 / Accepted: 22 January 2014 / Published: 27 January 2014
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Abstract

The microstructure and mechanical properties of Al-20Si produced by selective laser melting (SLM) are investigated for different heat treatment conditions. As a result of the high cooling rate during processing, the as-built SLM material displays a microstructure consisting of a supersaturated Al(Si) solid solution along with heavily refined eutectic Si and Si particles. The Si particles become coarser, and the eutectic Si gradually changes its morphology from fibrous to plate-like shape with increasing annealing temperature. The microstructural variations occurring during heat treatment significantly affect the mechanical behavior of the samples. The yield and ultimate strengths decrease from 374 and 506 MPa for the as-built SLM material to 162 and 252 MPa for the sample annealed at 673 K, whereas the ductility increases from 1.6 to 8.7%. This offers the possibility to tune microstructure and corresponding properties of the Al-20Si SLM parts to meet specific requirements. View Full-Text
Keywords: Al-20Si alloy; selective laser melting (SLM); heat treatment; microstructure; mechanical properties Al-20Si alloy; selective laser melting (SLM); heat treatment; microstructure; mechanical properties
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Ma, P.; Prashanth, K.G.; Scudino, S.; Jia, Y.; Wang, H.; Zou, C.; Wei, Z.; Eckert, J. Influence of Annealing on Mechanical Properties of Al-20Si Processed by Selective Laser Melting. Metals 2014, 4, 28-36.

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