To produce an aluminum alloy plate which is excellent in bendability and suitable for an automotive body sheet, an automotive part, a mechanical part, or the like.
In the method for producing the aluminum alloy plate excellent in bendability, an aluminum alloy plate essentially containing 0.5-1.3 mass% Si and 0.25-1.0 mass% Mg is subjected to a solution treatment step and then to a strain-imparting step. The difference in surface hardness (Vickers hardness measured under a load of 1 kg) between before and after the strain-imparting step is 3 Hv or higher. Since a suitable amount of strain is imparted to the Al-Mg-Si alloy plate after the solution treatment step, voids which become crystallization nuclei are generated at the vicinity of grain boundaries; thus, the PFZ width at the vicinity of grain boundaries, which is the propagation route of cracking, is narrowed, giving the aluminum alloy plate excellent in bendability.
TOTSUGI YOICHIRO
SHIMIZU YASUFUMI
| JPH02122055A | 1990-05-09 | |||
| JPS62278256A | 1987-12-03 |
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