Microstructural development during aging of 2014 aluminum alloy composite

摘要

The 2014 aluminum alloy reinforced with 0.1and 0.15 volume fraction of alumina particles (VFAP) havebeen solutionized for a range of time from 1.5 to 20 h at813K. The effect of solutionizing time(ST) on the agehardening response of the composites has been studied andcompared with the characteristics exhibited by the monolith.The results indicate that increasing the ST decreases the timerequired to get the peak hardness (TPH) values in themonolith but the composites do not show a systematicmonotonic behavior. The TPH values first decrease and thenincrease with an increase in ST at an aging temperature of473K for the composite. It has been speculated that he STinfluences the concentration of quenched-in vacancies andcontinued heating may affect the bonding between particlesand matrix which can generate additional dislocationsthroughout the solutionizing process due to curvature effects.