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Ductile bulk metallic glass by controlling structural heterogeneities
S Scudino1, J J Bian2, H Shakur Shahabi3,4
1IFW Dresden, Institute for Complex Materials, Helmholtzstraße 20, D-01069, Dresden, Germany. s.scudino@ifw-dresden.de.
Scientific Reports
|June 17, 2018
Summary
Designing structural heterogeneities in bulk metallic glasses (BMGs) enhances room-temperature plasticity. Imprinted BMGs show increased strength and ductility due to shear band branching and rotation at interfaces.
Area of Science:
- Materials Science
- Mechanical Engineering
- Physics
Background:
- Understanding structural heterogeneities is key to improving bulk metallic glasses (BMGs) plasticity.
- Controlling microstructure is essential for studying shear band formation and propagation.
Purpose of the Study:
- To investigate the impact of designed heterogeneities on the tensile mechanical behavior of a Zr-based BMG.
- To analyze how imprinted microstructures influence shear band dynamics.
Main Methods:
- Experimental analysis of imprinted Zr52.5Ti5Cu18Ni14.5Al10 BMG under tensile loading.
- Molecular dynamics and finite element simulations to model material behavior.
Main Results:
- Imprinted BMGs exhibit elastic heterogeneity and anisotropic mechanical properties.
- Strength and ductility increase with the loading angle relative to imprints.
- Shear band branching and rotation are observed, originating at heterogeneity interfaces.
Conclusions:
- Designed heterogeneities can enhance the plastic deformation of BMGs.
- Anisotropic behavior arises from shear band interactions with designed microstructures.
- Interfaces between heterogeneities play a critical role in modifying shear banding mechanisms.
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