【摘要】：采用硬度與電導(dǎo)率測(cè)試、拉伸試驗(yàn)、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(yàn),研究了不同熱處理工藝(固溶-T6時(shí)效,固溶-預(yù)壓縮-T6時(shí)效,預(yù)回復(fù)-固溶-預(yù)壓縮-T6時(shí)效和預(yù)回復(fù)-固溶-預(yù)壓縮-T76時(shí)效)對(duì)含鋯鍶復(fù)合微合金化的Al-10.78Zn-2.78Mg-2.59Cu-0.221Zr-0.0465Sr高強(qiáng)鋁合金組織與性能的影響。結(jié)果表明:在T6(120℃×24 h)時(shí)效制度下,預(yù)回復(fù)和預(yù)壓縮均能提高位錯(cuò)強(qiáng)化,并且預(yù)回復(fù)能顯著抑制再結(jié)晶;與固溶-預(yù)壓縮-T6相比,預(yù)回復(fù)-固溶-預(yù)壓縮-T6工藝能在不降低強(qiáng)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(jí)提高到EA級(jí));預(yù)回復(fù)-固溶-預(yù)壓縮-T76狀態(tài)下,合金強(qiáng)度低至600 MPa,但電導(dǎo)率高達(dá)31.58%ICAS,較T6時(shí)效下的抗腐蝕性能明顯改善。經(jīng)研究表明,Al-10.78Zn-2.78Mg-2.59Cu-0.221Zr-0.0465Sr高強(qiáng)鋁合金擠壓材在預(yù)回復(fù)-固溶-預(yù)壓縮-T6時(shí)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(hào)：2467019