| 摘要 |
PURPOSE: A heat treating method of aluminum alloy sheet is provided, which not only suppresses surface roughness generated during forming of the Al 2090 alloy sheet, but also improves formability of the Al 2090 alloy sheet by heat treating Al 2090 alloy sheet in the temperature range of 260 to 290 deg.C to remove delta phase after aging thereof. CONSTITUTION: In a method for heat treating the aluminum alloy sheet after aging an aluminum alloy sheet comprising a principal raw material of aluminum (Al), 1.9 to 2.6 wt.% of lithium (Li), 2.4 to 3.0 wt.% of copper (Cu), 0.08 to 0.15 wt.% of zirconium (Zr) and a balance of other inevitable impurities, the heat treating method of the aluminum alloy sheet comprises the process of heat treating the aging treated aluminum alloy sheet having the composition in the temperature range of 260 to 290 deg.C for 1 to 5 min so that delta (δ') phase deposited during aging treatment is removed as the delta (δ') phase is being melted in matrix.
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