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AlTi5B1 aluminium-titanium-boron master alloy supplied in coil form for grain refinement in aluminium and aluminium alloy production. Its nominal composition of approximately 5% titanium and 1% boron, with aluminium as the balance, promotes a finer and more uniform grain structure during solidification. Suitable for aluminium casting, billet, slab and foundry applications where controlled grain refinement is required.