Strain-hardening and suppression of shear-banding in rejuvenated bulk metallic glass
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View abstract on PubMed
Summary
This summary is machine-generated.Metallic glasses (MGs) can now exhibit strain-hardening, a crucial property for structural applications. Plastic deformation under triaxial compression rejuvenates MGs, enabling this beneficial behavior and preventing catastrophic failure.
Area Of Science
- Materials Science
- Mechanical Engineering
- Condensed Matter Physics
Background
- Strain-hardening is vital for engineering alloys, enhancing ductility and preventing failure.
- Metallic glasses (MGs) offer superior yield stress and fracture toughness but typically exhibit strain-softening, limiting their structural use.
- Strain-softening in MGs leads to localized plastic flow and premature failure.
Purpose Of The Study
- To investigate if metallic glasses can be rejuvenated to achieve strain-hardening.
- To explore the mechanism of rejuvenation and its effect on mechanical behavior.
- To assess the potential of rejuvenated MGs for structural applications.
Main Methods
- Plastic deformation of bulk metallic glass samples under triaxial compression at room temperature.
- Characterization of the rejuvenated state and its mechanical properties.
- Uniaxial tensile and compressive tests to evaluate strain-hardening and failure behavior.
Main Results
- Plastic deformation under triaxial compression successfully rejuvenates bulk metallic glass samples.
- A novel strain-hardening mechanism was observed in the rejuvenated metallic state.
- Rejuvenated MGs exhibit suppressed shear-banding, enhanced tensile ductility, and increased ultimate flow stress.
- The rejuvenated state is stable at room temperature and shows efficient strain-hardening.
Conclusions
- Metallic glasses can be engineered to exhibit strain-hardening through controlled plastic deformation.
- This transformation significantly enhances their mechanical properties and suitability for structural applications.
- The findings open new avenues for utilizing metallic glasses in demanding engineering scenarios.
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