(the one on the right is better)
cross-posted from: https://mander.xyz/post/13061179
A technique called transformation toughenening uses a bunch of small particles of zirconia dispersed in alumina causing compressive stresses at crack tips preventing them from propogating and increasing toughness
Denser grain per μm, nice.
I bet it costs a more, though. Aluminum is everywhere. (Maybe the manufacturing costs are high enough you don't notice, depending on what it is)