…I wanted to bookmark this article: “What Ever Happened to Scandium Bike Frames?” which I ran across the other day.
I think it’s a pretty good explanation of why scandium is significant, and the basic metallurgy of the aluminum/scandium mix.
One thing that isn’t mentioned, except in a passing reference in the end-user chart: Scandium is also being used in firearms. Smith and Wesson in particular has built a number of guns using scandium frames, like the 1911 E-Series.