Plus if the site is correct, they are less likely to dent!
I am trying to figure out how you hit the metal part of a tee and how that would break a bat. People whack those things on telephone poles and they don't break. It is good or a composite to be used for tee work.
I believe that freezing an aluminum bat has to do with recyrstallization. Recrystallization replaces exiting grains with new strain free grains. The density of dislocations is reduced, strength is lowered and ductility is increased. One desirable property of recrystallization is that grain size will be reduced if there has been a considerable amount of deformation, changing a large rain structure into a smaller and more desirable small grain one. This is for metal only.
It wasnt a tee. I was so mad I walked right back out as I thought she chose to use the bat on the thing and we both know she should know better. From what I saw of the thing it probably was some honkin metal contraption to discourage dropping of hands which she does. Ive seen them before but never really checked them out to know how they are used. It was a CF3. DD knows when to use her cage bat but listened to her new coach. Wish I was in there cause no way that would have happened...One time I dont watch like a hawk. After she broke her bat other players used facility bats to hit off the thing. Tell your daughters when to use their cage bats and stick to their guns. I know it may be hard for them but if they dont its a $230.00 mistake.