The eŠects of solution treatment temperature on the serration in 6061 aluminum alloy sheets were investigated by tensile test carried out at 303 K. In order to examine the microstructure change with solution treatment temperature, measurements of the electrical resistivity and grain size were performed. Serrations were quantitatively evaluated using the critical strain, mean amplitude and frequency of stress drops. The amplitude of stress drops increased with higher solution treatment temperature due to the increase of solute atoms, whereas the amplitude and the frequency of stress drops vanished rapidly at coarsening of grain size. The critical strain of A type serration decreased slightly with the rise of solution treatment temperature, whereas it of B type increased markedly due to the increase of solute atoms. Grain size had, furthermore, no eŠect on the critical strain for each serration.

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