Microstructure–wear behavior correlation on a directionally solidified Al–In monotectic alloy

•The microstructure/wear behavior of a monotectic Al–In alloy is investigated.•The correlation monotectic microstructures/wear behavior is of prime importance.•An experimental law relating interphase spacing (λ) and wear volume is proposed.•The increase in λ and In droplets diameter was found to improve the wear resistance.

Al–In monotectic alloys are potential alternatives for application in the manufacture of wear-resistant automotive components, such as cylinder liners and journal bearings. The comprehension regarding the development of distinct microstructures of monotectic alloys and their interrelation with wear behavior are challenges of prime importance. The present study aims to contribute to a better understanding of the relationship between the scale of the minority phase of the monotectic microstructure and the corresponding wear behavior. Transient directional solidification experiments were carried out with an Al–5.5 wt% In alloy with a view to provide samples with significant differences in the microstructural scale along the casting length. The results of wear tests permitted an experimental quantitative expression correlating the wear volume (V) with both the interphase spacing between indium droplets (λ) and time of wear tests (t) to be proposed. The increase in λ is shown to improve the wear resistance. The effect of λ on V becomes more significant as the sliding distance (or time) is increased.

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