Microstructure and mechanical properties of (Cr x Ti 1-x ) 2 AlC 211 MAX phases as composites through spark plasma sintering

MAX phases are intriguing materials due to their unique properties. However, each of these materials possesses its own weaknesses when subjected to service conditions. For example, while one MAX phase exhibits selflubricating feature, it may not perform well under high load conditions. This study investigates the impact of adding chromium to Ti 2 AlC on microstructure and mechanical properties. Samples are prepared through ballmilling and spark plasma sintering (SPS), then analyzed using various techniques. The presence of different phases, including MAX phases (Ti 2 AlC and Cr 2 AlC), carbides (TiC and Cr 7 C 3 ), and low amounts of oxides, is identified. Hardness, fractography, and wear characteristics are assessed through indentation and sliding tests. The study correlates the wear rate of each sample with experimental (H/E) and theoretical indicators (B/G), showing the production of composites with improved properties suitable for diverse applications.