含锆锶Al-Zn-Mg-Cu系高强铝合金热处理工艺的优化

发布时间：2019-04-27 13:20

【摘要】：采用硬度与电导率测试、拉伸试验、金相(OM)观察、X射线衍射(XRD)分析、晶间腐蚀和剥落腐蚀(EXCO)试验,研究了不同热处理工艺(固溶-T6时效,固溶-预压缩-T6时效,预回复-固溶-预压缩-T6时效和预回复-固溶-预压缩-T76时效)对含锆锶复合微合金化的Al-10.78Zn-2.78Mg-2.59Cu-0.221Zr-0.0465Sr高强铝合金组织与性能的影响。结果表明:在T6(120℃×24 h)时效制度下,预回复和预压缩均能提高位错强化,并且预回复能显著抑制再结晶;与固溶-预压缩-T6相比,预回复-固溶-预压缩-T6工艺能在不降低强度的情况下,提高抗晶间和剥落腐蚀性能(最大晶间腐蚀深度从125μm减少到91μm,剥落腐蚀从EB级提高到EA级);预回复-固溶-预压缩-T76状态下,合金强度低至600 MPa,但电导率高达31.58%ICAS,较T6时效下的抗腐蚀性能明显改善。经研究表明,Al-10.78Zn-2.78Mg-2.59Cu-0.221Zr-0.0465Sr高强铝合金挤压材在预回复-固溶-预压缩-T6时效工艺下的综合性能最佳。
[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，

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