Aluminum alloy sheet suitable for high-speed forming and process for manufacturing the same

Abstract From the Canadian patent

The present invention provides an aluminum alloy sheet suitable for high-speed forming at an average strain rate of 0.01 sec-1 or more, produced by using an aluminum alloy containing 4.0 to 10.0 wt.% of Mg inevitable impurities of Fe and Si whose content is limited to 0.2 wt.% or less, other impurity elements whose content is limited to 0.05 wt.% or less and the, balance of A?, wherein an m-value indicating strain rate sensitivity is -0.001 or less, an average tensile strength value obtained by dividing, by 4 the sum of a, ultimate tensile strength in a first direction at 0° to a rolling direction, double a ultimate tensile strength in a second direction at 45° to the rolling direction and …