Optimizing Aging Time: Mechanical Behaviour and Microstructure Evolution of A6061 Aluminium Alloy

The mechanical behaviour of A6061 Aluminium alloy, which is well known for its strength, corrosion resistance, and light properties, is investigated herein for various aging times (1, 2, 3, 4, and 5 hours) at 220°C. The study aims to establish the optimum aging time that maximizes the mechanical performance of the alloy by systematically studying microstructure changes and tensile properties (Ultimate Tensile Strength, Yield Strength, and %elongation). Microstructural observation revealed slight refinement in grain size. Strength was found to be increasing and decreasing with increasing aging time showing optimum range (UTS: 241 MPa, YS: 163 MPa, % elongation :11.7) at 3rd hour. The increasing and decreasing trend in the strength values is attributed to initiation of Mg2Si and finally the formation of equilibrium phase. The purpose of the research is to understand how aging influences precipitate development, which has a direct influence on the material's ductility, strength, and hardness. In addition, the study yields a comprehensive appreciation of the aged alloy’s suitability for various engineering applications, including structural, automotive, and aerospace components.