抄録
For excess Si type Al–Mg–Si alloys with different (coarse or fine) grain sizes, impact tensile tests by a split-Hopkinson bar method have been carried out using sheet specimens with two kinds of aspect (width/thickness) ratio. The impact tensile strength of the coarse alloy is higher than the static one, while that of fine alloy is lower. The elongation, however, is lower than the static one independently of alloy or specimen size. The decrease in the elongation is found to correspond to the increase in intergranular area on fracture surface. The specimen with the aspect ratio of 3 is not suitable to be used as the impact tensile specimen.
