Metallic Glasses and Amorphous Alloys

Metallic glasses are a class of metal alloys cooled rapidly enough from the melt that their atoms freeze into a disordered, non-crystalline arrangement rather than forming the regular lattice structures found in conventional metals. This amorphous structure gives them unusual combinations of high strength, hardness, and elasticity, but it also means they tend to fail suddenly through narrow regions of concentrated deformation called shear bands, which limits their practical use in load-bearing applications. A central challenge is understanding how composition and processing conditions govern a material's glass-forming ability — that is, how easily the disordered structure can be achieved and retained at useful scales — as well as how controlled introduction of nanocrystalline phases within the amorphous matrix might arrest shear band propagation and improve ductility. Researchers are actively working to connect atomic-scale structural features to macroscopic mechanical behavior, with the goal of designing alloys that retain the strength advantages of metallic glasses while accommodating plastic deformation without catastrophic fracture.

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Keywords

Bulk Metallic GlassesAmorphous AlloysMechanical BehaviorGlass Forming AbilityShear BandsNanocrystallization