Pressure-dependent flow behavior of Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5) bulk metallic glass

Creators: Lu, Jun; Ravichandran, Guruswami

Abstract

An experimental study of the inelastic deformation of bulk metallic glass Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5) under multiaxial compression using a confining sleeve technique is presented. In contrast to the catastrophic shear failure (brittle) in uniaxial compression, the metallic glass exhibited large inelastic deformation of more than 10% under confinement, demonstrating the nature of ductile deformation under constrained conditions in spite of the long-range disordered characteristic of the material. It was found that the metallic glass followed a pressure (p) dependent Tresca criterion τ = τ0 + βp, and the coefficient of the pressure dependence β was 0.17. Multiple parallel shear bands oriented at 45° to the loading direction were observed on the surfaces of the deformed specimens and were responsible for the overall inelastic deformation.

Additional Information

© 2003, Materials Research Society. (Received 19 November 2002; accepted 7 May 2003) This work was sponsored by the Structural Amorphous Metals Program of the Defense Advanced Research Projects Agency (DARPA), under ARO Contract No. DAAD19-01-1-0525, and in part by the Center for Science and Engineering of Materials at the California Institute of Technology through a grant from the MRSEC program of the National Science Foundation, which are gratefully acknowledged. The authors thank Professor W.L. Johnson for providing the facilities for processing of the material used in the study and for many helpful discussions.

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