Phys. Rev. Lett. 84, 2901 - 2904 (2000)

Microstructure Controlled Shear Band Pattern Formation and Enhanced Plasticity of Bulk Metallic Glasses Containing in situ Formed Ductile Phase Dendrite Dispersions

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C. C. Hays, C. P. Kim, and W. L. Johnson
Keck Laboratory of Engineering Materials, California Institute of Technology, Pasadena, California 91125

Received 28 June 1999

Results are presented for a ductile metal reinforced bulk metallic glass matrix composite based on glass forming compositions in the Zr-Ti-Cu-Ni-Be system. Primary dendrite growth and solute partitioning in the molten state yields a microstructure consisting of a ductile crystalline Ti-Zr-Nb β phase, with bcc structure, in a Zr-Ti-Nb-Cu-Ni-Be bulk metallic glass matrix. Under unconstrained mechanical loading organized shear band patterns develop throughout the sample. This results in a dramatic increase in the plastic strain to failure, impact resistance, and toughness of the metallic glass.

©2000 The American Physical Society

DOI: 10.1103/PhysRevLett.84.2901
PACS: 81.40.-z, 81.05.Kf

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