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Ductile bulk metallic glass.

Jan Schroers1, William L Johnson

  • 1Keck Laboratory of Engineering Materials, California Institute of Technology, Pasadena, California 91125, USA. schroers@caltech.edu

Physical Review Letters
|February 9, 2005
PubMed
Summary
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Researchers observed unprecedented global plasticity in a platinum-copper-nickel-phosphorus bulk metallic glass, achieving a 20% plastic strain. This discovery offers a new benchmark for metallic materials, showcasing exceptional strength and ductility.

Area of Science:

  • Materials Science
  • Solid Mechanics
  • Metallurgy

Background:

  • Bulk metallic glasses (BMGs) typically exhibit limited plastic deformation, hindering their structural applications.
  • Understanding the mechanisms governing plasticity in BMGs is crucial for developing advanced materials.

Purpose of the Study:

  • To investigate the global plasticity of a novel monolithic Pt-Cu-Ni-P bulk metallic glass.
  • To characterize the material's mechanical behavior under bending and compression loading.

Main Methods:

  • Experimental testing of monolithic Pt57.5Cu14.7Ni5.3P22.5 bulk metallic glass samples.
  • Application of bending and unconfined compression loading conditions.
  • Measurement of plastic strain, permanent deformation, and fracture toughness.

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Main Results:

  • A record plastic strain of 20% was achieved in the bulk metallic glass.
  • Significant permanent deformation and >3% strain before failure observed in 4 mm thick samples under bending.
  • High Poisson ratio (0.42) contributing to shear band extension and multiple shear band formation.
  • Exceptional combination of high strength, extensive ductility, and high elastic limit demonstrated.
  • Very high fracture toughness measured at approximately 80 MPa m(-1/2).

Conclusions:

  • The Pt-Cu-Ni-P bulk metallic glass exhibits unprecedented global plasticity, surpassing all previously reported metallic glasses.
  • The material's unique properties, including high Poisson ratio and multiple shear band formation, are responsible for its enhanced ductility and toughness.
  • This finding opens new avenues for designing high-performance metallic materials with superior mechanical properties.