Fracture behavior of laminated metal-metallic glass composites |
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Authors: | Y Leng T H Courtney |
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Affiliation: | (1) Department of Materials Science, University of Virginia, 22901 Charlottesville, VA |
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Abstract: | The crack growth behavior of metallic glass in laminated metal-metallic glass composites was investigated and compared to
the crack growth characteristics of monolithic metallic glass. The composite arrangement significantly increases the crack
growth resistance of the glass. Growth in the monolithic glass is catastrophic, whereas in the composite, it is stable. The
behavior is described in terms of crack growth resistance(R) curves and discussed in terms of extrinsic and intrinsic contributions to toughness. It is found that an extrinsic factor,i.e., matrix bridging, makes the major contribution to increased crack growth resistance and that a limiting crack opening displacement
model interprets the experimental data quite well. Enhanced glass deformation in the crack tip region, manifested by multiple
shear band formation, is responsible for the intrinsic toughening observed. Physical models are developed to estimate the
level of intrinsic toughening due to this effect. |
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