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Published March 27, 2000 | public
Journal Article Open

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


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.

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©2000 The American Physical Society Received 28 June 1999 The authors acknowledge the U.S. Department of Energy (Grant No. DEFG-03-86ER45242) for the support of C.C.H. We acknowledge the Army Research Office (Grant No. DAAG55-98-1-0305) for the support of C.P.K. We also thank Wayne Waller and Carolyn Patterson of the Caltech Digital Media Center for their assistance.


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