Designing metallic glass matrix composites with high toughness and tensile ductility

Douglas C. Hofmann, Jin Yoo Suh, Aaron Wiest, Gang Duan, Mary Laura Lind, Marios D. Demetriou, William L. Johnson

Research output: Contribution to journalArticle

1067 Scopus citations

Abstract

The selection and design of modern high-performance structural engineering materials is driven by optimizing combinations of mechanical properties such as strength, ductility, toughness, elasticity and requirements for predictable and graceful (non-catastrophic) failure in service. Highly processable bulk metallic glasses (BMGs) are a new class of engineering materials and have attracted significant technological interest. Although many BMGs exhibit high strength and show substantial fracture toughness, they lack ductility and fail in an apparently brittle manner in unconstrained loading geometries. For instance, some BMGs exhibit significant plastic deformation in compression or bending tests, but all exhibit negligible plasticity (<0.5% strain) in uniaxial tension. To overcome brittle failure in tension, BMG-matrix composites have been introduced. The inhomogeneous microstructure with isolated dendrites in a BMG matrix stabilizes the glass against the catastrophic failure associated with unlimited extension of a shear band and results in enhanced global plasticity and more graceful failure. Tensile strengths of ∼1 GPa, tensile ductility of ∼2-3 per cent, and an enhanced mode I fracture toughness of K1C ≈ 40 MPa m1/2 were reported. Building on this approach, we have developed 'designed composites' by matching fundamental mechanical and microstructural length scales. Here, we report titanium-zirconium-based BMG composites with room-temperature tensile ductility exceeding 10 per cent, yield strengths of 1.2-1.5 GPa, K1C up to ∼170 MPa m1/2, and fracture energies for crack propagation as high as G1C ≈ 340 kJ m-2. The K1C and G1C values equal or surpass those achievable in the toughest titanium or steel alloys, placing BMG composites among the toughest known materials.

Original languageEnglish (US)
Pages (from-to)1085-1089
Number of pages5
JournalNature
Volume451
Issue number7182
DOIs
StatePublished - Feb 28 2008
Externally publishedYes

ASJC Scopus subject areas

  • General

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    Hofmann, D. C., Suh, J. Y., Wiest, A., Duan, G., Lind, M. L., Demetriou, M. D., & Johnson, W. L. (2008). Designing metallic glass matrix composites with high toughness and tensile ductility. Nature, 451(7182), 1085-1089. https://doi.org/10.1038/nature06598