| 摘要 |
Provided is a metal structure containing 17-34 mass% Zn, 0.01-2.5 mass% Sn, 0.005-1.8 mass% Al, and 0.0005-0.030 mass% Pb, the balance being Cu and unavoidable impurities, the above elements being contained in amounts such that the relationships 24 ≤ [Zn] + 5 × [Sn] + 3 × [Al] ≤ 40 and 1.2 ≤ [Sn] + 2 × [Al] ≤ 4.0 are satisfied, the area ratio (γ)% of the γ phase and the area ratio (&bgr;)% of the &bgr; phase in the α-phase matrix having the relationship 0 ≤ 2 × (γ) + (&bgr;) ≤ 1.5, and 0-0.7% of the γ phase and 0-0.9% of the &bgr; phase, in terms of area ratio, being dispersed in the α-phase matrix. |
