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[Putnam]

You can characterize the relationship between two metals' edged capabilities as (SHEAR_FRACTURE_a/SHEAR_FRACTURE_d)*(MAX_EDGE/10000) If you do that calculation on adamantine vs steel compared to steel vs anything, it's kinda clear why adamantine just sorta always wins.

[Panando]

Yep. I was a little surprised that the adamanite sword could be deflected at all, since the material advantage in edge is so strong.

I suspect it has to do with momentum, if the equations in this post are correct, an adamantine short sword should have 0.114x the momentum of a steel short sword, it has 6.9x the shear fracture and 10x the max edge, so overall it should have 7.2x the penetration ability. That's a low enough advantage that I can see how a deflection is possible.

The axe on the other hand, being much heavier, should when made of addy have something like 0.23x the momentum of a steel axe and overall 15.9x the penetration ability.

In short, the sword is so light that its momentum suffers badly when made from addy. It's still much more penetrating than a steel sword, but the axe benefits a lot more from addy than the sword does.