ALUMINUM ALLOY HAVING SUPPRESSED ROOM TEMPERATURE AGING PROPERTY AND MANUFACTURING METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To suppress increase of yield strength by holding room temperature in an Al-Mg-Si alloy.SOLUTION: There is provided a manufacturing method of an alloy containing Mg:0.3 to 2.0% and Si:0.3 to 2.0%, further one of Cu:0.2 to 1.0% and Fe:0.05 to 0.3% and having yield stress value just after manufacturing of 150 MPa or less and a value of yield stress value when holding at 30°C for 20 days just after manufacturing minus yield stress value when holding for 10 days of 4 MPa or less and a manufacturing method by conducting a solution heat treatment at 500°C to the melting point with holding time of 1 minute to 1 hours, a heat treatment at 70 to 180°C with the holding time of 2 to 24 hours and then adding strain between plane strain and tensile strain of 0.2 to 2% by a tension leveler.SELECTED DRAWING: None