Designing metallic glass matrix composites with high toughness and tensile ductility

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 processabl...

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Published in:Nature (London) 2008-02, Vol.451 (7182), p.1085-1089
Main Authors: Duan, Gang, Lind, Mary-Laura, Wiest, Aaron, Demetriou, Marios D, Johnson, William L, Suh, Jin-Yoo, Hofmann, Douglas C
Format: Article
Language:English
Subjects:
Alloys
Composite materials
Condensed matter: structure, mechanical and thermal properties
Deformation
Deformation and plasticity (including yield, ductility, and superplasticity)
Dendrites
Ductility
Exact sciences and technology
Humanities and Social Sciences
letter
Materials science
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
multidisciplinary
Optimization
Physics
Plasticity
Science
Science (multidisciplinary)
Strain
Structural engineering
Tension
Titanium
Zirconium
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description 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 (
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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 (&lt;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. 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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.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>18305540</pmid><doi>10.1038/nature06598</doi><tpages>5</tpages></addata></record>
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subjects Alloys
Composite materials
Condensed matter: structure, mechanical and thermal properties
Deformation
Deformation and plasticity (including yield, ductility, and superplasticity)
Dendrites
Ductility
Exact sciences and technology
Humanities and Social Sciences
letter
Materials science
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
multidisciplinary
Optimization
Physics
Plasticity
Science
Science (multidisciplinary)
Strain
Structural engineering
Tension
Titanium
Zirconium
title Designing metallic glass matrix composites with high toughness and tensile ductility
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