Understanding the Links between the Composition-Processing-Properties in New Formulations of HEAs Sintered by SPS

• Main Authors: Paula Alvaredo-Olmos, Jon Molina-Aldareguía, Alvaro Vaz-Romero, Estela Prieto, Jesús González-Julián, Miguel Alberto Monclús
• Format: Article
• Language: English
• Published: MDPI AG 2021-05-01
• Series: Metals
• Subjects: composition design; high entropy alloy; gas atomization; Spark Plasma Sintering; high temperature nanoindentation; serrated flow
• Online Access: https://www.mdpi.com/2075-4701/11/6/888

This work presents two new compositions of high entropy alloys (HEAs) that were designed with the aim of obtaining a body-centered cubic (BCC) phase with high hardness values and a moderate density. Sintering was performed using Spark Plasma Sintering (SPS) with different heating rates to determine the influence of the processing parameters on the phase formation. The microstructural study revealed that the presence of Ni in the composition promoted phase separation, and the mechanical study confirmed a clear influence on the mechanical properties of both the composition and heating rate. The combination of microscopy with compression and nanoindentation tests at room and high temperature made it possible to advance our understanding of the relationships between the composition, processing, and properties of this emerging group of alloys.