Aluminium Zirconium master alloy has been added in experimentally in aluminium alloys (e.g 7xxx series... etc..) as a zirconium additive. Zirconium addition in the range of 0.1 - 0.3% are used to form a fine precipitate of intermetallic particles that inhibit recovery and recrystallization. An increasing number of alloys particularly in the aluminium - zinc - magnesium family, use zirconium additions to increase the recrystallization temperature and to control the grain structure in wrought products. Zirconium additions leave this family of alloys less quench sensitive than similar chromium additions. Higher level of zirconium are employed in some superplastic alloys to retain the required fine structure during elevated temperature forming.
Zirconium additions have been used to reduce the as - cast grain size, but its effect is less than titanium. In addition, zirconium tends to reduce the grain-refining effect of titanium plus boron additions so that it's necessary to use more titanium and boron to grain refine zirconium- containing alloy. But zirconium has no poisoning effect on Titanium-Carbon- aluminium grain refiner, thus its wiser to use TICAI grain refiner to grain refine the zirconium-containing alloys.