Influence of Cryo-milling on metal matrix interface and characteristics of AA5154 – ZrC composites

Abstract

This study presents the impact of cryomillingpressure less sintered AA5154-xZrC (x = 6, 12, 18 wt%) composites on their microstructural and mechanical properties. Cryogenic milling of composite powders in the presence of liquid nitrogen yielded dense compacts, which were then pressure-lessly sintered at 650°C for 5hours in an Argon/Hydrogen atmosphere. Cryomillingtime(15 or 30 min) and ZrC content significantly impact the density, elastic modulus, microstructures, and mechanical parameters of the sintered specimen (6, 12, 18 wt%).Bulk samples of AA5154 matrix composites strengthened with 6-18 wt% ZrC particles were obtained after 15 minutes of cryomilling, followed by pressure less sintering; the results showed relative densities between 97.41 and 98.52%, hardness values between 0.78 and 1.42 GPa, wear volume losses between 0.281 and 1.272 mm³, and elastic moduli between 284.3 and 434.7 GPa.