The influence of start-stop transient velocity on the friction and wear behaviour of a hyper-eutectic Al-Si automotive alloy

► Cast iron rings were slid against Al-Si in a lubricated start-stop tribometer test. ► Transient velocities caused greater wear to the ring but lower wear to the Al-Si. ► Tribo-film performance was investigated by FIB-SIMS mapping and depth profiling. ► Start-stop caused thinner tribo-films but frictional performance was not degraded.