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"Work-Hardenable" ductile bulk metallic glass.

Das J, Tang MB, Kim KB, Theissmann R, Baier F, Wang WH, Eckert J.

FG Physikalische Metallkunde, FB 11 Material- und Geowissenschaften, Technische Universit├Ąt Darmstadt, Petersenstrasse 23, D-64287 Darmstadt, Germany.

Usually, monolithic bulk metallic glasses undergo inhomogeneous plastic deformation and exhibit poor ductility (< 1%) at room temperature. We present a new class of bulk metallic glass, which exhibits high strength of up to 2265 MPa together with extensive "work hardening" and large ductility of 18%. Significant increase in the flow stress was observed during deformation. The "work-hardening" capability and ductility of this class of metallic glass is attributed to a unique structure correlated with atomic-scale inhomogeneity, leading to an inherent capability of extensive shear band formation, interactions, and multiplication of shear bands.

PMID: 16090260 [PubMed]