Transparent Alumina -
Three Times Stronger Than Steel

From Randy

A ceramic research lab in Dresden, Germany, has developed transparent Alumina by subjecting fine-grained (I'm guessing extremely fine-grained) aluminum to a whopping 1200 degrees Celsius ...the result of which is amazingly light but three times tougher than hardened steel of the same thickness, and it's see-through.
Needless to say, the Pentagon is quite interested.
For story (in German)
From Randy
According to a post at Slashdot (News for Nerds) this is not transparent aluminum but transparent Alumina, which is aluminum oxide - Al2-O3.

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