發(fā)布時間：2019-04-27 13:20

【摘要】：采用硬度與電導率測試、拉伸試驗、金相(OM)觀察、X射線衍射(XRD)分析、晶間腐蝕和剝落腐蝕(EXCO)試驗,研究了不同熱處理工藝(固溶-T6時效,固溶-預壓縮-T6時效,預回復-固溶-預壓縮-T6時效和預回復-固溶-預壓縮-T76時效)對含鋯鍶復合微合金化的Al-10.78Zn-2.78Mg-2.59Cu-0.221Zr-0.0465Sr高強鋁合金組織與性能的影響。結果表明:在T6(120℃×24 h)時效制度下,預回復和預壓縮均能提高位錯強化,并且預回復能顯著抑制再結晶;與固溶-預壓縮-T6相比,預回復-固溶-預壓縮-T6工藝能在不降低強度的情況下,提高抗晶間和剝落腐蝕性能(最大晶間腐蝕深度從125μm減少到91μm,剝落腐蝕從EB級提高到EA級);預回復-固溶-預壓縮-T76狀態(tài)下,合金強度低至600 MPa,但電導率高達31.58%ICAS,較T6時效下的抗腐蝕性能明顯改善。經研究表明,Al-10.78Zn-2.78Mg-2.59Cu-0.221Zr-0.0465Sr高強鋁合金擠壓材在預回復-固溶-預壓縮-T6時效工藝下的綜合性能最佳。
[Abstract]:By means of hardness and conductivity test, tensile test, metallographic (OM) observation, X-ray diffraction (XRD) analysis, intergranular corrosion and stripping corrosion (EXCO) test, different heat treatment processes (solution-T6 aging, aging) were studied. Solution-precompression-T6 aging, Effect of pre-recovery-solution-precompression-T6 aging and pre-recovery-solid solution-precompression-T76 aging on microstructure and properties of Al-10.78Zn-2.78Mg-2.59Cu-0.221Zr-0.0465Sr high-strength aluminum alloy containing zirconium-strontium composite microalloying. The results show that under T6 (120 鈩，

本文編號：2467019