Abstract
Using a recently developed hot cracking test, the cracking susceptibilities of the high-strength aluminium alloys 7010 and 7050 were investigated. The solidification conditions in the test are similar to those encountered in the ingot shell zone during semi-continuous direct chill casting. The influence of grain structure on cracking susceptibility was investigated. Al-Ti and Al-Ti-B grain refining master alloys were added to the melt at various levels in order to obtain grain structures ranging from columnar-dendritic to equiaxed-cellular. Without grain- refiner additions, columnar structures formed which had high cracking susceptibilities; 7010 being marginally less susceptible than 7050. With high grain-refiner additions, equiaxed-cellular grains formed in both alloys, again leading to high cracking susceptibility. Equiaxed-dendritic grains formed at moderate addition levels of grain refiner and were found to be more resistant to hot cracking than either of the other morphologies.
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