摘要：【中文】本发明公开了一种适用于热成形‑淬火一体化工艺专用的中强7xxx系铝合金板材，所述7xxx系铝合金板材的化学成分按重量百分比配比为Zn 5.1～6.7％，Mg 1.9～2.9％，Cu 1.2～2.6％，Fe 0～0.5％，Si 0～0.4％，Cr 0～0.1％，Zr 0～0.08％，Mn 0～0.25％，其中Cr、Mn、Zr等其它控制晶粒尺寸的微量元素总含量≤0.25％，余量为Al。基于热成形‑淬火一体化工艺特点，所述合金板材具备短时固溶性、低淬火敏感性和优异时效硬化等特性。合金板材能短时快速完成固溶处理，再经水冷或模冷或空冷后进行人工峰时效或烤漆处理后，最终板材的屈服强度＞400MPa、抗拉强度＞450MPa、延伸率＞6.5％。本发明的7xxx铝合金板材专用于热冲压模内淬火工艺的450MPa级中强7xxx系铝制结构件的制备。 【EN】The invention discloses a special medium-strength 7xxx series aluminum alloy plate suitable for a hot forming-quenching integrated process, which comprises the following chemical components, by weight, 5.1-6.7% of Zn, 1.9-2.9% of Mg, 1.2-2.6% of Cu, 0-0.5% of Fe, 0-0.4% of Si, 0-0.1% of Cr, 0-0.08% of Zr and 0-0.25% of Mn, wherein the total content of other trace elements for controlling the grain size, such as Cr, Mn, Zr and the like, is less than or equal to 0.25%, and the balance of Al. Based on the characteristics of the hot forming-quenching integrated process, the alloy plate has the characteristics of short-time solid solubility, low quenching sensitivity, excellent age hardening and the like. The alloy plate can quickly complete the solution treatment in a short time, and after the alloy plate is subjected to water cooling or die cooling or air cooling and then is subjected to artificial peak aging or baking finish treatment, the final plate has the yield strength of more than 400MPa, the tensile strength of more than 450MPa and the elongation of more than 6.5 percent. The 7xxx aluminum alloy plate is specially used for preparing a 450 MPa-grade medium-strength 7xxx series aluminum structural member of a quenching process in a hot stamping die.

摘要：【中文】本发明公开了一种高铜镁比的Al‑Zn‑Mg‑Cu‑Zr超高强铝合金铸锭分级均匀化处理工艺，具体步骤为：将合金铸锭以25～50℃/h从室温升温至375～425℃后保温5～15h；再以25～50℃/h升温至450℃后，继续以5～15℃/h升温至465～475℃间后保温时间1～4h；最后将合金以1～5℃/h升温至480～490℃并保温16～36h，随后空冷。本发明主要适用于Cu/Mg＞1的超高强Al‑Zn‑Mg‑Cu合金，通过分级工艺处理，不仅能够促进合金中Al₃Zr纳米级弥散相的均匀析出，提高合金后续变形组织的高温稳定性；同时能有效消除铸锭中低熔点非平衡共晶相T相(AlZnMgCu相)，并且也充分考虑到了T相向S相(Al₂CuMg相)的转变等因素，最终实现T相和S相的完全回溶，有力避免了S相在基体中残留，从而改善或提高铝材的综合性能。 【EN】The invention discloses a graded homogenization treatment process of an Al-Zn-Mg-Cu-Zr ultrahigh-strength aluminum alloy cast ingot with a high copper-magnesium ratio, which comprises the following specific steps: heating the alloy cast ingot from room temperature to 375-425 ℃ at a speed of 25-50 ℃/h, and then preserving heat for 5-15 h; heating to 450 ℃ at a speed of 25-50 ℃/h, continuing heating to 465-475 ℃ at a speed of 5-15 ℃/h, and keeping the temperature for 1-4 h; and finally, heating the alloy to 480-490 ℃ at the speed of 1-5 ℃/h, preserving the heat for 16-36 h, and then cooling in air. The invention is mainly suitable for the ultrahigh-strength Al-Zn-Mg-Cu alloy with Cu/Mg more than 1, and can promote Al in the alloy by treatment through a grading process₃The Zr nanoscale disperse phase is uniformly precipitated, so that the high-temperature stability of the subsequent deformation structure of the alloy is improved; meanwhile, the low-melting-point nonequilibrium eutectic phase T (AlZnMgCu) in the ingot can be effectively eliminated, and the T-phase S (Al) phase is fully considered₂CuMg phase), and the like, finally realizing the complete re-dissolution of the T phase and the S phase, and powerfully avoiding the S phase from remaining in the matrix, thereby improving or enhancing the comprehensive performance of the aluminum material.