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Selective Laser Melting of Al-7Si-0.5 Mg-0.5Cu: Effect of Heat Treatment on Microstructure Evolution, Mechanical Properties and Wear Resistance

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

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.

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Acknowledgements

This work was financially supported by the Guangdong Basic and Applied Basic Research Foundation (2020A1515110869), Shenzhen International Cooperation Research (GJHZ20190822095418365) and the Natural Science Foundation of SZU (Grant No. 2019040). Additional support was provided by the European Regional Development Fund (ASTRA6-6). Jürgen Eckert is grateful for the support from the Ministry of Science and Higher Education of the Russian Federation in the framework of the Increase Competitiveness Program of MISiS (Support project for young research engineers, Project No. K2-2020-046).

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Correspondence to Konda Gokuldoss Prashanth.

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Wang, P., Yu, S., Shergill, J. et al. Selective Laser Melting of Al-7Si-0.5 Mg-0.5Cu: Effect of Heat Treatment on Microstructure Evolution, Mechanical Properties and Wear Resistance. Acta Metall. Sin. (Engl. Lett.) 35, 389–396 (2022). https://doi.org/10.1007/s40195-021-01279-1

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  • DOI: https://doi.org/10.1007/s40195-021-01279-1

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