Caracterização da liga de alta entropia CrMnFeCoNi obtida através de moagem mecânica de alta energia

Abstract

High Entropy (LAE) alloys are metallic materials that are standing out in recent years, due to the obtaining of a material with important properties, such as high hardness, corrosion resistance, wear, thermal stability and fatigue resistance, enabling them use in different fields of application. Unlike classic metallurgy where commonly used alloys are based on a single main element, high entropy alloys are multicomponent alloys, containing five or more elements in almost equal (echistomic) proportions and feature simple crystalline structures. In this sense, the objective of the work was to produce a high entropy alloy, consisting of chromium (CR), manganese (MN), iron (Fe), cobalt (CO) and nickel (NI), through high energy grinding. The obtained league was characterized by scanning electron microscopy (SME), energy dispersion spectroscopy (EDS) and X-ray diffraction (DRX), aiming to investigate alloy phase formation. In addition, initially a computational simulation of phase formation was made through Pandattm software, in order to analyze the feasibility of formation of the CRMNFeconi Echiatomic League. The results showed that the high energy grinding method employed in this work was efficient to obtain the high entropy alloy. Since the diffractograms showed well -defined diffraction points, thus revealing the formation of a cubic cubic crystal phase of centered face. Three LAE samples at different times, 5h, 10h and 15h, were samples, with the sample with 15 hours of grinding that obtained the best result, as it presented the main peak of the league, as well as a decrease in the intensity of the peaks related to secondary phases. Through the MEV it was possible to observe the change in morphology, as well as the evolution of miscegenation of the different posts and league formation, noting that grinding time was an important factor for obtaining and greater homogenization of the alloy.