Lab discovers titanium-gold alloy that is four times harder than most steels (phys.org)

Interesting, I guess. Lots of things matter as much or more - ductility, toughness, crack resistance, corrosion resistance.

At least it'll be cheaper than existing offerings… hold on… I'm getting a message from the control booth… gold. It's made with actual gold.

Already expensive implants won't be getting any more affordable in the foreseeable future.