A:  2024 Aluminum Alloy

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2024 aluminum is a high-strength wrought alloy from the 2000 series, primarily alloyed with copper (about 4.4%), along with magnesium and manganese. It's widely used in aerospace and structural applications due to its balanced properties. "Certified" 2024 aluminum typically refers to material that meets industry standards (e.g., ASTM, AMS, or ISO certifications for chemical composition, mechanical properties, and quality control), ensuring reliability and traceability.