Al-7Si-0.5 Mg-0.5Cu alloy specimens have been fabricated by selective laser melting(SLM).In this study,the effects of solution treatment,quenching,and artificial aging on the microstructural evolution,as well as mechanical and wear proper-ties,have been investigated.The as-prepared samples show a heterogeneous cellular microstructure with two different cell sizes composed of α-Al and Si phases.After solution-treated and quenched(SQ)heat treatment,the cellular microstructure disappears,and coarse and lumpy Si phase precipitates and a rectangular Cu-rich phase were observed.Subsequent aging after solution-treated and quenched(SQA)heat treatment causes the formation of nanosized Cu-rich precipitates.The as-prepared SLMs sample has good mechanical properties and wear resistance(compressive yield strength:215±6 MPa and wear rate 2×10-13 m3/m).The SQ samples with lumpy Si particles have the lowest strength of 167±13 MPa and the highest wear rate of 6.18×10-13 m3/m.The formation of nanosized Cu-rich precipitates in the SQA samples leads to the highest compressive yield strength of 233±6 MPa and a good wear rate of 5.06×10-13 m3/m.

Pei Wang;Sijie Yu;Jaskarn Shergill;Anil Chaubey;Jurgen Eckert;Konda Gokuldoss Prashanth;Sergio Scudino

Additive Manufacturing Institute,College of Mechatronics and Control Engineering,Shenzhen University,Shenzhen 518060,China;Institute for Complex Materials,IFW Dresden,Helmholtzstra?e 20,01069 Dresden,Germany;Institute of Minerals and Materials Technology(IMMT),Bhubaneshwar 751013,Orissa,India;Erich Schmid Institute of Materials Science,Austrian Academy of Sciences,Jahnstra?e 12,8700 Leoben,Austria;Department of Materials Science,Chair of Materials Physics,Montanuniversit?t Leoben,Jahnstra?e 12,8700 Leoben,Austria;Adjunct With National University of Science and Technology ?MISiS?,Leninsky Prosp.,4,119049 Moscow,Russia;Department of Mechanical and Industrial Engineering,Tallinn University of Technology,Ehitajete tee 5,19086 Tallinn,Estonia;CBCMT,School of Mechanical Engineering,Vellore Institute of Technology,Vellore,Tamil Nadu 632 014,India

金属学报（英文版）

[1]Pei Wang;Sijie Yu;Jaskarn Shergill;Anil Chaubey;Jurgen Eckert;Konda Gokuldoss Prashanth;Sergio Scudino-.Selective Laser Melting of Al-7Si-0.5 Mg-0.5Cu:Effect of Heat Treatment on Microstructure Evolution,Mechanical Properties and Wear Resistance)[J].金属学报（英文版）,2022(03):389-396

lumpy

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