They used it in the risers to add stringth and weight in some cases.I've seen several older models ie 1950's - to the late 1960's target and hunting bows that used it.Mostly not in production bows.There was also a company about 4-6 years ago using aluminum in the risers of thier long bows.It kinda added a neat looking trim to the bow as well.But I kinda think everyone found out what all the old guy's already tried.It don't glue up to good.Bear Archery used it in thier bow laminations about 1951?? did not work then eather.But I am sure plenty of them old models are still in working order.bd