Comparison of the Annealing Heat-Treated Microstructure and Hardness of the AA۲۰۲۴-T۴ and AA۶۰۶۱-T۶ Alloys

Precipitation Hardenable Aluminum Alloys are suitable alternatives in electric vehicle bodies due to their lower specific weight compared to steel. Therefore, the development and understanding of the properties of aluminum alloys help to develop electric vehicles, reduce greenhouse gas emissions, and control global warming. In this research, we investigated the heat treatment of AA۲۰۲۴-T۴ and AA۶۰۶۱-T۶ alloys at a temperature of ۴۵۳ °C for ۲۱۰ minutes in a tube furnace with a heating rate of ۵ oC/min in a vacuum (۷.۵×۱۰-۱۳ Torr). The alloys were assessed by optical microscopy (OM), scanning electron microscopy (SEM), and hardness test. The effect of heat treatment was investigated on the particle size as well as the phases. The particle diameter and hardness value of AA۲۰۲۴-T۴ decreased after heat treatment. The number of precipitates in AA۲۰۲۴-T۴ increased after heat treatment. Precipitates size in AA۶۰۶۱-T۶ alloy remained almost unchanged after the heat treatment.

کلیدواژه ها:

Aluminum Alloys ، AA۲۰۲۴-T۴ ، AA۶۰۶۱-T۶