An Al-5Zn-1Mg alloy was aged at three different temperatures, 70 ° C, 150 ° C, and 200 ° C to obtain different states of precipitation. Serrated flow behaviour was studied with progressive aging at these three different aging temperatures. A comparison of serrated flow behaviour for the three different aging condition was made in the peak aged condition. Finally, serrated flow behaviour in Al-5Zn-1Mg alloy was compared with that in Al-Li alloys studied earlier. It is concluded that all the features of serrated flow can be explained only by considering the combined effect of solute - dislocation and precipitate - dislocation interaction.
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