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 properties, 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.

Al-7Si-0.5 Mg-0.5Cu 合金试样已通过选择性激光熔化 (SLM) 制造。在这项研究中，研究了固溶处理、淬火和人工时效对显微组织演变以及机械和磨损性能的影响。所制备的样品显示出具有两种不同细胞尺寸的异质细胞微观结构，由α-Al 和 Si 相。经过固溶淬火（SQ）热处理后，细胞组织消失，观察到粗大块状的Si相析出和矩形富Cu相。固溶处理和淬火 (SQA) 热处理后的后续时效会导致形成纳米尺寸的富铜沉淀。所制备的SLMs样品具有良好的机械性能和耐磨性（压缩屈服强度：215±6 MPa，磨损率为2×10 ^–13 m ³ /m）。含块状硅颗粒的 SQ 样品的最低强度为 167 ± 13 MPa，最高磨损率为 6.18 × 10 ^–13 m ³/米。SQA 样品中纳米级富铜沉淀的形成导致最高压缩屈服强度 233 ± 6 MPa 和良好的磨损率 5.06 × 10 ^–13 m ³ /m。