新型热机械处理对Al-Zn-Mg-Cu合金显微组织与性能的影响

发布时间：2018-01-26 05:25

本文关键词： 高强铝合金时效热机械处理应力腐蚀　出处：《中国有色金属学报》2015年04期 　论文类型：期刊论文

【摘要】：通过拉伸实验、慢应变速率实验、剥落腐蚀实验、扫描电镜和透射电镜观察,研究新型热机械处理对Al-Zn-Mg-Cu合金显微组织及性能的影响。结果表明:冷变形最终热机械处理能够使合金在塑性不显著降低的情况下,提高合金的强度,温变形最终热机械处理能有效弥补常规最终热机械处理后伸长率较低的缺陷,同时能有效改善合金的抗剥落腐蚀性能;回归后冷变形可提高合金强度,但降低了合金的伸长率;回归后温变形处理能使合金获得良好的综合性能,如力学性能、抗应力腐蚀性和抗剥蚀性能。新型热机械处理改善合金性能的机理是合金晶粒形态、位错、初生相以及析出相等显微组织结构的协同作用。
[Abstract]:The tensile test, slow strain rate test, exfoliation corrosion test, scanning electron microscope and transmission electron microscope were used. The effect of new thermo-mechanical treatment on microstructure and properties of Al-Zn-Mg-Cu alloy was studied. The results show that the final thermo-mechanical treatment of cold deformation can make the alloy have no significant reduction in plasticity. By increasing the strength of the alloy, the final thermo-mechanical treatment of warm deformation can effectively compensate for the defects of low elongation after conventional final thermo-mechanical treatment, and improve the corrosion resistance of the alloy effectively. Cold deformation after regression can increase the strength of the alloy, but decrease the elongation of the alloy. The thermal deformation treatment after regression can make the alloy obtain good comprehensive properties, such as mechanical properties, stress corrosion resistance and denudation resistance. The mechanism of the new thermal mechanical treatment to improve the properties of the alloy is the grain morphology and dislocation of the alloy. The synergistic effect of the primary phase and the precipitated equivalent microstructure.
【作者单位】：中南大学材料科学与工程学院;中南大学轻合金研究院;湖南人文科技学院机电工程系;
【基金】：国家自然科学基金资助项目(50871123) 中澳科技合作特别基金资助项目(51011120052)
【分类号】：TG146.21
【正文快照】： 航空航天高技术的发展对铝合金的综合性能提出了越来越高的要求[1-3]。作为航空航天重要支撑的Al-Zn-Mg-Cu合金具有高的比强度、易加工成型以及较好的焊接性能,但其对应力腐蚀和剥落腐蚀比较敏感,能够提升该合金综合性能的回归再时效(Retrogression and reaging,RRA)、热机械

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