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Related Experiment Videos

"Work-Hardenable" ductile bulk metallic glass.

Jayanta Das1, Mei Bo Tang, Ki Buem Kim

  • 1FG Physikalische Metallkunde, FB 11 Material- und Geowissenschaften, Technische Universität Darmstadt, Petersenstrasse 23, D-64287 Darmstadt, Germany.

Physical Review Letters
|August 11, 2005
PubMed
Summary

Researchers developed a new bulk metallic glass with high strength and remarkable ductility. This advanced metallic glass material demonstrates significant work hardening and improved plastic deformation capabilities.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Solid Mechanics

Background:

  • Monolithic bulk metallic glasses typically show limited ductility (<1%) due to inhomogeneous plastic deformation at room temperature.
  • Achieving high strength and ductility simultaneously in metallic glasses remains a significant challenge in materials science.

Purpose of the Study:

  • To introduce and characterize a novel class of bulk metallic glass exhibiting enhanced mechanical properties.
  • To investigate the structural origins of the improved work hardening and ductility in this new metallic glass.

Main Methods:

  • Mechanical testing to determine strength, work hardening, and ductility.
  • Microstructural analysis to correlate atomic-scale inhomogeneity with deformation behavior.
  • Analysis of shear band formation, interactions, and multiplication during plastic deformation.

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Main Results:

  • The new bulk metallic glass achieves high strength up to 2265 MPa.
  • Demonstrates extensive work hardening and a large ductility of 18%.
  • Observed a significant increase in flow stress during deformation, indicating robust work hardening.

Conclusions:

  • The enhanced work hardening and ductility are attributed to a unique atomic-scale inhomogeneous structure.
  • This structure facilitates extensive shear band formation, interactions, and multiplication, enabling large plastic deformation.
  • This class of bulk metallic glass represents a significant advancement in materials for structural applications requiring both strength and toughness.