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Published June 15, 2009 | Published
Journal Article Open

Fracture toughness and crack-resistance curve behavior in metallic glass-matrix composites


Nonlinear-elastic fracture mechanics methods are used to assess the fracture toughness of bulk metallic glass (BMG) composites; results are compared with similar measurements for other monolithic and composite BMG alloys. Mechanistically, plastic shielding gives rise to characteristic resistance-curve behavior where the fracture resistance increases with crack extension. Specifically, confinement of damage by second-phase dendrites is shown to result in enhancement of the toughness by nearly an order of magnitude relative to unreinforced glass.

Additional Information

©2009 American Institute of Physics. Received 6 May 2009; accepted 27 May 2009; published 18 June 2009. Supported by the Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 (for M.E.L. and R.O.R.), with funding for D.C.H. and W.L.J. from the Office of Naval Research under Grant No. N00014-07-1-1115. D.C.H. acknowledges financial support from the Department of Defense via a NDSEG fellowship. # 81.40.Np Fatigue, embrittlement, fracture and failure # 62.20.mm Fracture in solids # 62.20.mt Cracks in solids

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