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News

AA205 cast aluminium alloy gains AMS specifications

Aeromet : 20 September, 2012  (New Product)
Aeromet International has developed a new high strength aluminium cast alloy registered with the Aluminium Association as AA205.

AMS specifications for both sand and investment castings have been cleared by the AMS Technical Committee “D” and the SAE Aerospace Council and have been designated as AMS4471 for investment castings and AMS4482 for sand castings. These specifications have also been presented to the Federal Aviation Authority’s MMPDS technical committee and will be entered into the next edition of the MMPDS handbook.

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AA205 is based on the aluminium copper alloy system, an alloy system which historically has been extremely susceptible to casting defects such as; shrinkage pore formation, segregation and hot tearing. These castability issues have severely limited the widespread integration of aluminium copper based alloys into current aerospace designs. Aeromet International has been able to control the aforementioned castability issues through fundamental alterations to the solidification and feeding mechanisms operating in the alloy in a process termed ‘solidification engineering’. This ‘solidification engineering’ results in an extremely fine grained thamnitic microstructure which allows the alloy to feed in a pseudo-thixotropic fashion, this is in contrast to the normal interdendritic feeding observed in all other cast aluminium alloys. These fundamental alterations to the alloy solidification mechanisms result in vastly improved resistance to the typical cast defects detailed above. Not only is there an elimination of the macro defects inherent to the aluminium copper alloy system but there is also an elimination of micro-shrinkage type defects typically observed in the more foundry friendly aluminium silicon alloy system.

The improvements ascertained through solidification engineering allow the AA205 alloy to compete with certain wrought materials allowing designers greater freedom in component design and at the same time demonstrating cost efficiency and waste saving potential over machine from solid manufacturing routes.

AMS specification minimums for AA205 are presented in this table:

 

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