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Al-5Ti-C alloy was prepared and the microstructure evolution during the remelting process and its grain refinement performance toward pure aluminium were investigated. The results show that Al-5Ti-C alloy with a more uniform microstructure was successfully prepared, and it was composed of Al, TiAl3 and TiC. At a remelting temperature of 730°C, with the increase in heat preservation time of remelted melt, the originally dispersed TiC was aggregated and pushed toward grain boundaries by α-Al, while TiAl3 dissoluted, aggregated and grew. At a temperature of 1000°C, with the increase in heat preservation time, not only TiC aggregated, but also the size and morphology of TiAl3 were changed significantly as well, the TiAl3 turning in morphology from lump-like or strip-like into coarse needle-like and flake-like grains. The grain refinement experiments show that Al-5Ti-C and remelted Al-5Ti-C master alloy have good grain refining performances. [ABSTRACT FROM AUTHOR]

• Recycling and reusing of Ti chips produced by machining. • Machining Ti chips can be used as a substitute for K 2 TiF 6. • The dissolution time of Ti chips has an exponential relationship with its radius. Al-5Ti-1B master alloys were prepared by acting machining Ti chips, KBF 4 with aluminum melt in this study. The effects of reaction temperatures and reaction times on the microstructures of Al-5Ti-1B master alloy were systematically investigated. The results show that the optimal reaction temperature and reaction time is 1173 K and 90 min, respectively. The refining performance of Al-5Ti-1B under optimal conditions is almost the same as that of commercial Al-5Ti-1B. The recovery rate of Ti using machining Ti chips is higher than that using K 2 TiF 6 and the recovery rate of B is unaffected. The dissolution time of Ti chip has an exponential relationship with its radius and reducing the radius is an effective way to reduce the reaction time. [ABSTRACT FROM AUTHOR]