Effect of Al alloys on selective laser melting behaviour and microstructure of in situ formed particle reinforced composites

► Effect of Al alloy was examined on SLM facilitated in situ interaction with Fe2O3. ► The Al alloy influenced the SLM consolidation performance and the formed phases. ► In situ Al (alloy) composites were reinforced by ultrafine/nanoscale particles. ► The Al alloy affected the appearance of reinforced matrix. ► Enhanced solid solubility of matrix contributed to hardening.