Bronze Chainplates

[pelorus32]

Either should be fine if appropriately sized. Nickel Aluminium Bronze is tough to work and it is also more difficult that silicon bronze to cast. It you are casting and your foundry is not used to AB2 then it's better to use silicon bronze.

Having said that AB2 or any of the other NiAl bronzes are wonderful metals and great to use. Just sticky to work.