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Rejuvenation engineering in metallic glasses by complementary stress and structure modulation
Summary
Researchers used X-ray diffraction to study how stress and structural rejuvenation affect the mechanical properties of metallic glasses at a microscale. While focused on materials science, understanding plastic deformation in amorphous metals contributes to developing more durable engineered materials.
Abstract Residual stress engineering is very widely used in the design of new advanced lightweight materials. For metallic glasses the attention has been on structural changes and rejuvenation processes. High energy scanning X-ray diffraction strain mapping reveals large elastic fluctuations in notched metallic glasses after deformation under triaxial compression. Microindentation hardness mapping hints to a competing hardening-softening mechanism after compression and further reveals the complementary effects of stress and structure modulation. Transmission electron microscopy proves that structure modulation and the distribution of elastic heterogeneities under room temperature deformation relates to the shear band formation. Molecular dynamics simulations provide an atomistic understanding of the confined deformation mechanism in notched metallic glasses and the related fluctuations in the elastic and plastic strains. Thus, future focus should be given to stress modulation and elastic heterogeneity that together with structure modulation may allow to design metallic glasses with enhanced ductility and strain hardening ability.
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