C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 21/06 (2006.01) C22F 1/047 (2006.01)
Patent
CA 2102951
Abstract of the Disclosure 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 a ultimate tensile strength in a third direction at 90° to the rolling direction is 280 MPa or more, and a maximum difference in the ultimate tensile strength in the first, second and third directions is 5 MPa or more. This invention further provides a process for manu- facturing an aluminum alloy sheet suitable for high- speed forming, having the steps of subjecting, to a homogenization treatment at 480°C or above, an aluminum alloy ingot containing 4.0 to 10.0 wt.% of Mg, inevit- able 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?, subjecting the aluminum alloy ingot, which has undergone the homogenization treatment, to a hot rolling process and a cold rolling process, thereby obtaining a cold rolled sheet, and subjecting the cold rolled sheet to an annealing process in which the cold rolled sheet is heated at a temperature of 300 to 450°C at a heating rate of 200°C/h or less and the cold rolled sheet is maintained for six hours or less at the temperature.
Bekki Yoichiro
Hayashi Minoru
Syoji Ryo
Kawasaki Steel Corporation
Ridout & Maybee Llp
The Furukawa Electric Co. Ltd.
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