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In this paper, effect of secondary ageing process on the hardness and the abrasive wear resistance of AlSi10Mg casting alloys was studied. In the T6 temper heat treatment, AlSi10Mg alloy was aged at 170 °C for 4 hours. In secondary ageing process, AlSi10Mg alloy aged at 170 °C for 10 or 30 minutes was re-aged at 100 °C for 135 hours. Abrasive wear tests were performed on pin-on disk abrasive wear tester under 20 N and 30 N loads and 180 Mesh abrasive papers and at the sliding speed of 0.2 ms-1. Abrasive wear test results revealed that specimen aged at 170 °C for 30 minutes and then re-aged at 100 °C for 135 hours has the highest abrasive wear resistance. [ABSTRACT FROM AUTHOR]