Enhancing mechanical properties of aluminum foam through optimized artificial aging: temperature and time effects

This research focuses on optimizing artificial aging parameters to enhance the mechanical properties of aluminum foam, specifically targeting industries where lightweight yet durable materials are critical. The primary object of this study is to identify optimal temperature and time conditions during artificial aging that will improve the foam’s hardness and compressive strength. The problem addressed is the variability in mechanical properties caused by inconsistent aging parameters, which affect the performance of aluminum foam in high-stress applications such as aerospace and automotive industries. Using Response Surface Methodology (RSM) and a Central Composite Design (CCD), the study systematically examines the effects of aging temperature and time on aluminum foam. A total of 13 experimental runs were conducted to observe the interaction of these parameters. Results obtained through ANOVA analysis reveal that temperature has a more substantial effect on foam hardness than time. The optimal conditions for aging were determined to be 165 °C for 2 hours, resulting in a hardness of 62.4 HV and compressive strength of 2.512 N/mm2. The findings are explained by the formation of fine, uniformly distributed precipitates at lower temperatures and shorter durations, which block dislocation motion and enhance material strength. In contrast, over-aging at higher temperatures leads to precipitate coarsening, which reduces the foam’s mechanical properties. The results of this study provide valuable insights for industries requiring materials with high strength-to-weight ratios, such as aerospace and automotive sectors, where aluminum foam can be used for structural components and energy absorption.