Exploration of Pseudobinary Alloys (Al–Mn)‐(Co–Fe–Ni) to Design High‐Entropy and Compositionally Complex Alloys to Stabilize the τ Phase in Al–Mn‐Based Ferromagnetic Alloys
Year: 2026
Type: article
Abstract: This study examines alloys in the pseudobinary system. The objective is to gain a deeper understanding of the thermodynamic limits of the ferromagnetic Al–Mn phase within the broader context of high‐entropy alloys (HEAs) and CompositionallyComplex Alloys (CCAs). Although this phase shows promise as a rare‐earth‐free permanent magnet, its industrial application remains challenging due to its intrinsic instability. The present work investigates nine distinct compositions located along a line in a four‐dimensional compositional space, combining an alloy with in varying proportions. The alloys have been produced using a cold‐crucible levitation furnace, heat‐treated, and studied in their as‐cast condition. Characterization methods included X‐ray diffraction (XRD) and magnetic propertymeasurements. The experimental findings highlight a complex interplay between composition, phase stability, and magnetic response, demonstrating that conventional HEA design strategies are insufficient for this alloy system. The study concludes that a more robust, thermodynamically informed approach is required to efficiently explore the design space of HEAs and CCAs based on metastable phases. Furthermore, the magnetic properties evolve significantly with composition. This evolution is not reflected in the XRD patterns, indicating that it arises not only from crystal structure changes but also from factors such as local atomic ordering.
Source: Advanced Engineering Materials
DOI: 10.1002/adem.70935
Institutions: Centre National de la Recherche Scientifique, Arts et Métiers, Laboratoire d'Étude des Microstructures et de Mécanique des Matériaux, Laboratoire Procédés et Ingénierie en Mécanique et Matériaux, École Normale Supérieure Paris-Saclay, Laboratoire des systèmes et applications des technologies de l'information et de l'énergie
Language: English
Topic: High Entropy Alloys Studies
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,520
OpenAlex ID: W7162103296