Aluminum alloy forging
An aluminum alloy forging includes 0.30 mass % or more and 1.0 mass % or less of Cu; 0.63 mass % or more and 1.30 mass % or less of Mg; 0.45 mass % or more and 1.45 mass % or less of Si; the balance being Al and inevitable impurities, wherein the following relations are satisfied, [Mg content]×1.587≥−4.1×[Cu content] 2 +7.8×[Cu content]−1.9 (1) [Si content]×2.730≥−4.1×[Cu content] 2 +7.8×[Cu content]−1.9 (2) and the ratio of the integrated intensity Q1 of the X-ray diffraction peak of the CuAl 2 phase to the integrated intensity Q2 of the X-ray diffraction peak of the (200) plane of the Al phase obtained by the X-ray diffraction method, Q1/Q2, is 2×10 −1 or less.
1. An aluminum alloy forging, comprising: 0.3 mass % or more and 1. 0 mass % or less of Cu; 0.63 mass % or more and 1.30 mass % or less of Mg; 0.45 mass % or more and 1.45 mass % or less of Si; 0.03 mass % or more and 0.25 mass % or less of Cr; and 0.05 mass % or less of Zr; the balance being Al and inevitable impurities,
wherein the following relations are satisfied,
[Mg content]×1.587≥−4.1×[Cu content] 2 +7.8×[Cu content]−1.9 (1)
[Si content]×2.730≥−4.1×[Cu content] 2 +7.8×[Cu content]−1.9 (2)
and the ratio of the integrated intensity Q1 of the X-ray diffraction peak of the CuAl 2 phase to the integrated intensity Q2 of the X-ray diffraction peak of the (200) plane of the Al phase obtained by the X-ray diffraction method, Q1/Q2, is 2×10 −1 or less.
2. The aluminum alloy forging according to claim 1 , wherein the content of Mg is 0.63 mass % or more and 1.25 mass % or less, the content of Si is 0.60 mass % or more and 1.45 mass % or less, and the ratio of the content of Si to the content of Mg, Si/Mg, is 0.5 or more in the molar ratio.
3. The aluminum alloy forging according to claim 1 , wherein the content of Mg is 0.85 mass % or more and 1.30 mass % or less, the content of Si is 0.45 mass % or more and 0.69 mass % or less, and the ratio of the content of Si to the content of Mg, Si/Mg, is less than 0.5 in the molar ratio.
4. The aluminum alloy forging according to claim 1 , wherein the content of Mn is 0.03 mass % or more and 1.0 mass % or less, the content of Fe is 0.2 mass % or more and 0.7 mass % or less, the content of Ti is 0.012 mass % or more and 0.035 mass % or less, the content of B is 0.001 mass % or more and 0.03 mass % or less, and the content of Zn is 0.25 mass % or less.
5. The aluminum alloy forging according to claim 2 , wherein the content of Mn is 0.03 mass % or more and 1.0 mass % or less, the content of Fe is 0.2 mass % or more and 0.7 mass % or less, the content of Ti is 0.012 mass % or more and 0.035 mass % or less, the content of B is 0.001 mass % or more and 0.03 mass % or less, and the content of Zn is 0.25 mass % or less.
6. The aluminum alloy forging according to claim 3 , wherein the content of Mn is 0.03 mass % or more and 1.0 mass % or less, the content of Fe is 0.2 mass % or more and 0.7 mass % or less, the content of Ti is 0.012 mass % or more and 0.035 mass % or less, the content of B is 0.001 mass % or more and 0.03 mass % or less, and the content of Zn is 0.25 mass % or less.
7. The aluminum alloy forging according to claim 1 , wherein the content of Fe is 0.23 mass % or more and 0.7 mass % or less.
8. The aluminum alloy forging according to claim 1 , wherein the content of Ti is 0.012 mass % or more and 0.035 mass % or less.
9. The aluminum alloy forging according to claim 1 , wherein the content of Ti is 0.012 mass % or more and 0.025 mass % or less.
10. The aluminum alloy forging according to claim 1 , wherein the content of Ti is 0.012 mass % or more and 0.02 mass % or less.
11. The aluminum alloy forging according to claim 1 , wherein the content of Cr is 0.03 mass % or more and 0.2 mass % or less.
12. The aluminum alloy forging according to claim 11 , wherein the content of Mg is 0.63 mass % or more and 1.25 mass % or less, the content of Si is 0.60 mass % or more and 1.45 mass % or less, and the ratio of the content of Si to the content of Mg, Si/Mg, is 0.5 or more in the molar ratio.
13. The aluminum alloy forging according to claim 11 , wherein the content of Mg is 0.85 mass % or more and 1.30 mass % or less, the content of Si is 0.45 mass % or more and 0.69 mass % or less, and the ratio of the content of Si to the content of Mg, Si/Mg, is less than 0.5 in the molar ratio.
14. The aluminum alloy forging according to claim 11 , wherein the content of Mn is 0.03 mass % or more and 1.0 mass % or less, the content of Fe is 0.2 mass % or more and 0.7 mass % or less, the content of Ti is 0.012 mass % or more and 0.035 mass % or less, the content of B is 0.001 mass % or more and 0.03 mass % or less, and the content of Zn is 0.25 mass % or less.
15. The aluminum alloy forging according to claim 12 , wherein the content of Mn is 0.03 mass % or more and 1.0 mass % or less, the content of Fe is 0.2 mass % or more and 0.7 mass % or less, the content of Ti is 0.012 mass % or more and 0.035 mass % or less, the content of B is 0.001 mass % or more and 0.03 mass % or less, and the content of Zn is 0.25 mass % or less.
16. The aluminum alloy forging according to claim 13 , wherein the content of Mn is 0.03 mass % or more and 1.0 mass % or less, the content of Fe is 0.2 mass % or more and 0.7 mass % or less, the content of Ti is 0.012 mass % or more and 0.035 mass % or less, the content of B is 0.001 mass % or more and 0.03 mass % or less, and the content of Zn is 0.25 mass % or less.
17. The aluminum alloy forging according to claim 11 , wherein the content of Fe is 0.23 mass % or more and 0.7 mass % or less.
18. The aluminum alloy forging according to claim 11 , wherein the content of Ti is 0.012 mass % or more and 0.035 mass % or less.
19. The aluminum alloy forging according to claim 11 , wherein the content of Ti is 0.012 mass % or more and 0.025 mass % or less.
20. The aluminum alloy forging according to claim 11 , wherein the content of Ti is 0.012 mass % or more and 0.02 mass % or less.