Silicon carbide particle reinforced aluminium matrix composites (SiCp/Al) are widely used in corrosive service environments, where corrosion-induced damage can severely compromise their mechanical integrity. Despite existing studies on corrosion behaviour and mechanical properties, the quantitative coupling between corrosion damage morphology and the resulting mechanical degradation of SiCp/Al composites has not yet been systematically clarified. In this study, such a link is established through a combined experimental and numerical framework. Both general (uniform) and localised corrosion were characterised following 96 h of immersion in EXCO solution. The results reveal a quantitatively resolved trend: the depth of general corrosion remains nearly independent of SiCp volume fraction, while the severity of localised corrosion increases markedly with increasing SiCp content. Stress–strain responses for composites with four representative SiCp volume fractions ranging from 0% to 45% were obtained experimentally and reproduced numerically. The phase field AT1 model, coupled with a homogenisation method, effectively predicted the mechanical behaviour of SiCp-reinforced composites before and after corrosion across a wide range of SiCp volume fractions, extending beyond those directly tested experimentally. Additionally, ultimate strength and failure strain maps were constructed as functions of SiCp volume fractions and corrosion degrees, providing a quantitative design and assessment tool for evaluating the mechanical performance of SiCp-reinforced aluminium composites in corrosive environments.
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