Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
High-entropy Alloy CrMnFeNiCu: A Thermal and Structural Characterization Study
Submission Author:
Athos Fernandes Araujo , SC
Co-Authors:
Catarina Meiko Hayashi, Daniel Cunha, Manoel Kolling Dutra, Francielen Pujol Nobre , Athos Fernandes Araujo, Felipe Martina André, Claudio Poffo
Presenter: Athos Fernandes Araujo
doi://10.26678/ABCM.COBEM2023.COB2023-2405
Abstract
Cutting edge materials drove humankind development throughout history and alloying has proven that synergistic effects can provide innovative properties to metallic materials. With this motivation, high entropy alloys (HEAs) have been studied in recent years. These alloys are designed with at least five elements in near-equiatomic proportions to attain thermodynamic stability of simple phases with aleatory atomic distribution. The HEA system CrMnFeNiCu (chrome, manganese, iron, nickel, and copper) has been synthesized by MA (mechanical alloying). The characterization by XRD (x-ray diffraction) indicates, in early milling hours, the coexistence of BCC (body centered cubic) and FCC (face centered cubic) phases of CrMnFeNiCu HEA. Further characterization (during milling times 10h and 15h) shows the evolution of these phase fractions and the ratios of nanocrystalline components versus interfacial components in the synthesized nanostructured HEA. Thermal properties were investigated using DSC (differential scanning calorimetry) and PAS (photoacoustic spectroscopy), to evaluate Cp (specific heat capacity), α (thermal diffusivity), and k (heat conductivity). Preliminary DSC results of early milling stages indicate a Cp value of 0.5882 J/gK.
Keywords
High entropy alloys, Mechanical Alloying, laser directed energy deposition (L-DED), XRD, DSC
