Table 4 Nominal compositions wt of mechanically alloyed dispersionstrengthened aluminumbase alloys

Alloy

Al

Mg Li

C

O

IncoMAP alloy AL-9021

bal

1.5 . . .

1.1

0.8

IncoMAP alloy AL-9052

bal

4.0 . . .

1.1

0.6

IncoMAP alloy AL-905XL

bal

4.0 1.3

1.1

0.6

Addition of lithium to mechanically alloyed aluminum alloys has produced an ultra lightweight alloy, IncoMAP AL-905XL. Its density is 8% lower and stiffness 10% greater than the age-hardenable conventional alloy 7075-T73 of comparable strength. The excellent combination of the properties makes this alloy very attractive for airframe applications. In particular, the freedom from age-hardening treatments makes it possible to produce forgings and heavy sections with homogeneous metallurgical structures.

Recently, high-strength aluminum-titanium alloys have been developed using MA by dispersing nanometer or submicron-sized Al3Ti intermetallic particles (in addition to the Al2O3 and Al4C3 dispersoids from addition of PCAs) in an aluminum matrix. Similar approaches could be used to develop high strength alloys in other systems.

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