High strain-rate doformation characteristics in commercial aluminium alloys.

High strain-rate deformation characteristics in some commercial aluminium alloys, or 1050, 3003, 3004, 5182 and 7N01 alloys, have been investigated at high strain rate over 103s-1.The main conclusions are summarized as follows;(1) The strain-rate sensitivity of flow stress in all commercial aluminium alloys has been observed in the high strain rate range.(2) Three types in typical change of ductility with strain rate have been observed in the high strain rate range; the first is that little change in ductility over strain rate as both 1050 and 7N01 alloys, the second is that ductility increases with strain rate as both 3003 and 3004 alloys, and the last is that ductility decreases with strain rate as 5182 alloy.(3) The alloys, that show larger ductility in the high strain rate range than that in the low strain rate range, are both 3003 and 3004 alloys, but both alloys of 5182 and 7N01 show lower ductility in the high strain rate range than in the low strain rate range, and 1050 alloy shows no change in ductility.(4) In commercial aluminium alloys, it is clear that one of the requirements to obtain larger ductility in the high strain rate range is an increasing value of strain rate sensitivity exponent m with strain.