| 摘要 |
The invention concerns an alloy comprising copper and manganese, whereof the composition in Cu and Mn is included within the polygon ABCD, in a system of co-ordinate axes with the Mn content (wt.%) on the horizontal axis and that of Cu (wt.%) on the vertical axis, defined by the co-ordinates of points A, B, C and D. A: 0.075 (horizontal axis), 0.65 (vertical axis); B: 0.50 (horizontal axis ), 0.65 (vertical axis); C: 0.35 (horizontal axis), 0.4 (vertical axis); D: 0.25 (horizontal axis), 0.4 (vertical axis); the remainder being constituted by Al and the unavoidable impurities. |
