Metals 2014, 4, 28-36; doi:10.3390/met4010028OPEN ACCESSmetalsISSN 2075-4701www.mdpi.com/journal/metals/ ArticleInfluence of Annealing on Mechanical Properties of Al-20Si Processed by Selective Laser MeltingPan Ma 1,2, Konda G. Prashanth 2, Sergio Scudino 2,*, Yandong Jia 1,2, Hongwei Wang 1, Chunming Zou 1, Zunjie Wei 1,* and Jürgen Eckert 2,31School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; E-Mails: mapanhit@hotmail.com (P.M.); yandongjia@outlook.com (Y.J.);wanghw@hit.edu.cn (H.W.); zoucm@hit.edu.cn (C.Z.)2 IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany;E-Mails: k.g.prashanth@ifw-dresden.de (K.G.P.); j.eckert@ifw-dresden.de (J.E.)3 TU Dresden, Institut für Werkstoffwissenschaft, D-01062 Dresden, Germany*Authors to whom correspondence should be addressed; E-Mails: s.scudino@ifw-dresden.de (S.S.);weizj@hit.edu.cn (Z.W.); Tel.: +49-351-4659-838 (S.S.); +86-451-8640-3150 (Z.W.);Fax: +49-351-4659-452 (S.S.); +86-451-8641-8131 (Z.W.).Received: 17 December 2013; in revised form: 12 January 2014 / Accepted: 22 January 2014 / Published: 27 January 2014Abstract: The microstructure and mechanical properties of Al-20Si produced by selectivelaser melting (SLM) are investigated for different heat treatment conditions. As a result ofthe high cooling rate during processing, the as-built SLM material displays amicrostructure consisting of a supersaturated Al(Si) solid solution along with heavilyrefined eutectic Si and Si particles. The Si particles become coarser, and the eutectic Sigradually changes its morphology from fibrous to plate-like shape with increasingannealing temperature. The microstructural variations occurring during heat treatmentsignificantly affect the mechanical behavior of the samples. The yield and ultimatestrengths decrease from 374 and 506 MPa for the as-built SLM material to 162 and252 MPa for the sample annealed at 673 K, whereas the ductility increases from 1.6 to8.7%. This offers the possibility to tune microstructure and corresponding properties of theAl-20Si SLM parts to meet specific requirements.Keywords: Al-20Si alloy; selective laser melting (SLM); heat treatment; microstructure;mechanical properties
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