Abstract

The microstructure evolution, mechanical properties and corrosion properties of Al–Mg–Si alloy during nonisothermal aging (NIA) were studied. The results show that as the aging time increases, the hardness, electric conductivity and the intergranular corrosion (IGC) resistance of the alloy increase, which relates to changes of microstructures. GP zones are primary formed in the initial heating stage. In the cooling stage, high-density, needle-like β" are main precipitates. The alloy through NIA treatment exhibits excellent mechanical properties and satisfactory corrosion resistance, resulting from the combination effects of the growth of original β" in the heating stage, the new formation of fine β" phase and the coarsening grain boundary precipitates during the cooling process.

中文翻译：

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Al-Mg-Si合金非等温时效过程中的组织演变及相关性能

摘要

研究了非等温时效（NIA）过程中Al-Mg-Si合金的组织演变，力学性能和腐蚀性能。结果表明，随着时效时间的增加，合金的硬度，电导率和耐晶间腐蚀性能均增加，这与组织的变化有关。GP区域是在初始加热阶段初步形成的。在冷却阶段，高密度的针状β“是主要的析出物。通过NIA处理的合金具有优异的机械性能和令人满意的耐腐蚀性，这归因于原始β”在加热阶段的生长的综合作用。在冷却过程中，新形成了细小的β”相，并且晶界的粗化沉淀。