Compact tension fracture toughness specimens of high strength aluminium alloy 7010 have been tested after the application of retrogression and reaging (RRA) heat treatments. Short transverse orientation specimens, 25 mm in thickness were cut from a large rectilinear open die forging. Two retrogression temperatures were investigated, 200 and 240 ° C, and the RRA treatments were applied to material in the solution treated and cold compressed (W52) condition. Varying the retrogression time and temperature strongly influences the fracture toughness and does so to a degree that is greater than would be expected from the change in tensile properties alone. The fracture toughness, tensile properties and work hardening characteristics of alloy 7010 are reported and their dependence on retrogression time and temperature is described.
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