99.99%, 99.5%Al and several kinds of Al alloys containing small amounts of Zr were studied on the casting structure and recystallization by means of hardness measurments, X-ray methods and tensile testings. Results obtained were as follows:
1) 99.99%Al-Zr alloy had refined casting grains for Zr content of more than 1%, and had high recrystallization temperature.
2) 99.5%Al-Zr alloy had a high recrystallization commencing temperature, which was 400°C in case of 0.3%Zr, and had refined grains for Zr content of more than 0.5%
3) Si had a marked effect on the recrystallization temperature of pure Al-Zr alloys.
4) Zr had small effect on the recrystallization temperature of Al-5%Mg alloy, but a marked effect on refining of the grain
5) Al-0.1%B-0.58%Zr alloy had a very high recrystallization temperature and perfectly refined equiaxial grains
6) 52S-and 61S-Zr alloys had a little higher recrystallization temperature respectively when worked by 50%. Their corrosion resistance, however, were not changed by the addition. Zr.
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