Aluminum bronze

An introduction to aluminum bronze

Aluminum bronzes are principally alloys of copper and aluminum.

In addition to aluminum, which ranges from 5 to 14 %, other most commonly used alloying elements are nickel, iron, manganese, silicon and tin.

Three principle types of aluminum bronzes are available:

  • The low alloy, single-phase alpha alloys contain less than 8 % aluminum, have a good ductility and are well suited for cold working into tube, sheet and wire products.
  • Two-phase or duplex alloys contain from 8 to 11 % aluminum and are usually additionally alloyed with iron and nickel to achieve higher strength. The increased aluminum content causes the appearance of the relatively harder beta phase, resulting in higher strength and hardness.
  • Copper-aluminum-silicon alloys with aluminum contents of about 6 % and additionally silicon contents of up to 2 % are called silicon-aluminum bronzes. Originally developed for the manufacture of propellers, these alloys feature improved foundry properties and application properties, especially good resistance to impact and cavitation.

Aluminum bronzes standards and specifications

UK USA Germany France Europe Manufacturers Specifications Company
BS B23   WL 2.0966        
DTD 197*         MSRR 8503 Rolls-Royce
  AMS 4640 WL 2.0966 UA10N      
      NF L14-705   ASN-A 3406 Airbus
    WL 2.0978 UA11N   ASN-A 3315 Airbus
      NF L14-706      
BS B24     UE9P      
DTD 265A*     NF L14-703      
    WL 2.1504        
  AMS 4880