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

M. E. Launey, D. C. Hofmann, J.-Y. Suh, H. Kozachkov, W. L. Johnson, R. O. Ritchie
2009 Applied Physics Letters  
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
more » ... ghness by nearly an order of magnitude relative to unreinforced glass.  Author to whom correspondence should be addressed. Electronic mail: roritchie@lbl.gov. URL: www.lbl.gov/Ritchie.
doi:10.1063/1.3156026 fatcat:i4rvmzq3ffbzxltumsj2k3hvha