Enhanced strength-ductility synergy of aging treated (FeCoNi1.5CrCu)p/2024Al composite

Abstract

In this study, the effects of aging treatment (AT) on (FeCoNi1.5CrCu)p /2024Al composites treated by solution treatment (ST) and deep cryogenic treatment (DCT) was systematically carried out. The analysis reveals that due to the mismatch of thermal expansion coefficients of Al and high entropy alloys (HEA) particles during DCT, a large amount of dislocations accumulate near the HEA, and lattice distortion energy is generated at the interface, which provides the driving force for the nucleation of the precipitates. The three phases: intracrystalline precipitated phase, intergranular precipitated phase and HEA reinforced phase, synergistically regulate the macroscopic mechanical properties of the (FeCoNi1.5CrCu)p /2024Al composite. The compression strength, maximum compression ratio, fracture absorption energy of 160 ℃× 10 h composites are 408.79 MPa, 25.88%, 7.89 × 107 J/m3 are enhanced by 3.5%, 10.6%, 15.9% separately in comparison to the unaged.