Abstract:Over the past years, high-entropy metallic glasses (HEMGs) have attracted increasing research interest due to their unique structural characteristics arising from high configurational entropy, as well as distinctive properties such as sluggish diffusion, microstructural heterogeneity, enhanced glass-forming ability (GFA), and improved thermal/mechanical stability. Similar to conventional metallic glasses (MGs), HEMGs lack long-range atomic periodicity; however, the high-entropy effect introduces additional complexity in structural evolution, such as decoupling of the glass transition, potential glass-to-glass transitions, and a continuous polyamorphic transition during reheating. This enables HEMGs with tunable atomic rearrangement, atomic interactions, and chemical/topological heterogeneity, thereby conferring great potential for achieving superior structural and functional properties. Although several review papers have summarized the development of HEMGs, the rapid advancement of this field inspires us to provide a concise overview discussion of the latest research progress in HEMG-forming alloy systems. This review first focused on the GFA of newly developed HEMGs, followed by a comparative analysis of their unusual structural relaxation, crystallization behavior, and mechanical properties relative to conventional MGs. Finally, the unique atomic-scale structure and structural heterogeneity of HEMGs were reviewed, and the review concluded with a summary and outlook.