You're not trying to make Excaliber are you?
"I would think you could get an edge measured in molocules, lasting for a very long time, very lighweight, corrosion proof at room temp. And a complete mystery to a culture at the dark age level. (Lord help em if they had to sharpen the thing)"
A blade made out of such a material would be "magical" to a Medieval society.
Lee, (I'd much rather have Stormbringer)