The tensile properties of three aluminium bronzes with 0·5, 0·8, and 1·0 wt-% Co have been determined for two levels of prior cold work and a wide range of aging conditions. Cold deformation before aging accelerated the age-hardening processes and increased the maximum 0·2% proofstress attained. In all alloys cold worked to 25% reduction in area before aging, a proofstress of more than 400 MN m−2 and an elongation to failure of over 15% were easily obtained, but the 1·0 wt-% Co alloy is preferred because of its relative insensitivity to prior cold work.
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