Abstract
The microstructure and mechanical properties of a range of Al–Li alloys containing up to 20 at.-% lithium have been determined. Properties have been measured in the solution-treated condition and after aging to produce ordered particles of δ′-(Al3Li) precipitation. For the aging conditions used in the present work the δ′-particles are sheared by dislocations. Consideration of various mechanisms suggests that Al–Li alloys are strengthened by order hardening or a combination of order and modulus hardening. Coherency strains around the δ′ or increased area of the sheared precipitate contribute very little to the observed strength.
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