Abstract

The influence of precipitation strengthening on the Bauschinger effect of aluminium alloy 2024 has been investigated. The material was aged at 463 and 478 K for various lengths of time. Under certain aging and straining conditions, reverse flow curves with concave parts were observed. The amount of concavity was quantified by defining a new parameter, the Bauschinger concavity energy. A Bauschinger stress parameter was used in the quantitative analysis of the Bauschinger effect. It was noted that the Bauschinger effect increased with increasing aging time and amount of prestrain up to a saturation level and that overaging does not affect the Bauschinger stress parameter. The Bauschinger concavity energy has its maximum value for certain aging and prestraining conditions. The loss of coherency between the matrix and precipitates and/or high strains reduce the values of the Bauschinger concavity energy.

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