The flow behavior and constitutive equation of (Al3Ti+Al2O3)/2024Al composites during hot compression

Abstract

In this study, Al3Ti and nano-Al2O3 co-reinforced aluminum matrix composites were prepared in situ autogenously using TiO2 and Al alloys as raw materials. The high-temperature compression properties of the composites were tested at temperatures ranging from 300 to 500 °C and strain rates ranging from 0.0014 s−1 to 0.42 s−1. Excellent high-temperature properties were demonstrated due to the presence of a large amount of Al3Ti and nano-Al2O3 high-temperature phases in the composites. The peak compressive stress of (Al3Ti+Al2O3)/2024Al composites gradually decreases with increasing temperature and increases with increasing strain rate. The study also calculated the deformation activation energy of the composites and the intrinsic structure model during hot compression. This is a guideline for obtaining the material thermal processing conditions of new composites with excellent high-temperature properties.