Ductile metallic glasses

Abstract

This application relates to glass-forming iron-based alloys which, when prepared as metallic glasses or mixed structures comprising metallic glasses and nanocrystalline phases, achieve a particular combination of strength and ductility. Specifically, the alloy has been measured to have strains up to 97% and strengths up to 5.9 GPa. Furthermore, elasticities up to 2.6% consistent with the amorphous structure have been observed. Thus, the new alloys developed lead to structures and properties that yield high elasticity corresponding to metallic glasses, high plasticity corresponding to ductile crystalline metals, and high strength as can be observed in nanomaterials.

Description

technical field [0001] The present disclosure relates to iron-based alloys, to ductile metallic glasses resulting in relatively high strength, high elastic elongation, and high plastic elongation, and to methods of making the same. Background technique [0002] Metallic nanocrystalline materials and metallic glasses can be considered as special classes of materials known to exhibit relatively high hardness and strength properties. Due to their potential, they are considered candidates for structural applications. However, such materials may exhibit limited fracture toughness associated with rapid propagation of shear bands and / or cracks, which may be a concern for technical applications of these materials. While these materials may exhibit sufficient ductility by compression testing, in tension testing these materials may exhibit near zero elongation and be in a brittle state. The inherent inability of such materials to deform in tension at room temperature may be a limiti...

AI Technical Summary

Problems solved by technology

As the grain size gradually decreases, the formation of dislocation stacks can become more difficult, limiting the ability to strain harden, which can lead to mechanical instability and cracking under load

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