Méthode et approche de conception d'alliages fonctionnel dans le cadre d'alliages à haute entropie et composition complexe.

In an effort to explore alloy composition domains beyond those of alloys with only 2 or 3 main elements, several studies on High Entropy Alloys, Complex Composition Alloys, or Multi-Principal Element Alloys have attempted to explore much broader composition domains. However, more variances also imply the need for a robust strategy to avoid the risk of getting lost. In this context, several indicators have been developed to assess in advance the relevance of exploring a set of compositions. However, these criteria have not yet shown sufficient effectiveness to be relied upon in all situations. Moreover, the limits of validity of these criteria are also difficult to know. Thus, in the process of designing a functional alloy, it seems necessary to proceed methodically. Exploring too large a space may lead to poor exploration, or too little in detail, risking missing interesting results. Conversely, exploring a limited space risks trapping us in a local optimum. In this sense, we have developed strategies to efficiently explore these spaces, taking as our study object an alloy of Aluminum, Cobalt, Iron, Manganese, and Nickel, with the criteria to optimize being its stability and magnetic properties, with the aim of creating a permanent magnet. We will base our work on the τ phase of Aluminum Manganese, which we will attempt to increase in entropy with the addition of other elements. To do this, we will conduct series of tests iteratively on several compositions, heat treatments, and property measurements, gradually refining our parameters to conclude on the explored space, draw its limits, and build the next step based on the results