Silver-bearing Al-Cu-Mg alloy and heat treatment method for silver-bearing Al-Cu-Mg alloy to obtain high-strength P structure
A heat treatment method, al-cu-mg technology, applied in the field of aluminum alloy heat treatment, can solve the problems of unfavorable alloy fatigue resistance, stress concentration, crack propagation across grain boundaries, etc.
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[0050] Example 1
[0051] The composition of alloy 1 is: 3.6% Cu, 1.2% Mg, 0.5% Ag, 0.7% Mn, 0.03% Ti, and the balance is Al. After the hot-rolled sheet is recrystallized and annealed at 300°C for 240 minutes, it is solid-dissolved at 510°C for 20 minutes, and water quenched, and then natural aging treatment for 96h. The tensile properties of the aged sheet obtained are: tensile strength of 474MPa, yield strength of 302MPa, The elongation is 19.7%, and the fatigue resistance is: ΔK=30MPam 1 / 2 ,da / dN=5.74×10 -3 mm / cycle.
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[0052] Example 2
[0053] The composition of alloy 2 is: 4.0% Cu, 1.0% Mg, 0.8% Ag, 0.4% Mn, 0.08% Ti, and the balance is Al. After the hot-rolled sheet was recrystallized and annealed at 350°C for 180 minutes, it was solid-dissolved at 500°C for 50 minutes and water quenched, and then natural aging treatment for 96h. The tensile properties of the aged sheet obtained were: tensile strength of 469MPa, yield strength of 314MPa, The elongation rate is 22.5%, and the fatigue resistance is: ΔK=30MPam 1 / 2 ,da / dN=3.84×10 -3 mm / cycle.
Example Embodiment
[0054] Example 3
[0055] The composition of alloy 3 is: 4.5% Cu, 1.8% Mg, 0.3% Ag, 1.2% Mn, 0.15% Ti, and the balance is Al. After the hot-rolled sheet is recrystallized and annealed at 400°C for 120 minutes, it is solid-dissolved at 490°C for 80 minutes, and water quenched, and then natural aging treatment for 96h. The tensile properties of the aged sheet are: tensile strength of 460MPa, yield strength of 295MPa, The elongation rate is 23.2%, and the fatigue resistance is: ΔK=30MPam 1 / 2 ,da / dN=2.46×10 -3 mm / cycle.
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