| 摘要 |
The invention provides a Al-Mg aluminum alloy board with a fewer tensile strain marks, and an excellent shaping property. The aluminum alloy board is exerted with a definite prestrain in advance and then is molded by extrusion, and the board has a certain amount of Mg, and the heat absorption peak value height of the heating curve between 100-150 DEG C. from solid phase obtained in the heat changeduring the board melting process determined by the differential thermal analysis is above 28 muW/mm<3>, thereby inhibiting tensile strain marks during extrusion molding under a rigor shaping condition. |
