I handled procurement contracts in my career for aluminum and titanium castings, as well as SS forgings, but I honestly don't know what scandium is; apart from S&W's useage of it for their lightweight guns.
I don't like the lightweight Smith guns. First, there is no "heft". It doesn't feel like a gun. Further, I found +P revolvers very uncomfortable to shoot.
By contrast, I find the R9 enjoyable to shoot and nothing is more satisfying than a nice hollow point .45ACP going out of my Glock 36. Well, okay, there are more satisfying things in life but not on this forum.