[Robert A Cook PE]

Sword/axe/knife blade are going to require an "edge" sharpness and toughness that may, or may not be, possible.

These guys don't say.

Also, though a cast helmet might be pretty, the toughness and ductility of the metal (needed to resist impact (to bend and absorb shick) may, or may not be present....

The stuff might hold an edge as well as brass or copper, or might be as easy to machine as titantium.... Something that can be cast might not be able to be machined. Depend too on expansion under heat, and machinability.

[SauronOfMordor]

Also, though a cast helmet might be pretty, the toughness and ductility of the metal (needed to resist impact (to bend and absorb shick) may, or may not be present....

Since the current application is for golf-club heads, I'm thinking it should be fairly able to resist shock and impact