Ductile bulk metallic glass. [Phys Rev Lett. 2004] - PubMed Result

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1: Phys Rev Lett. 2004 Dec 17;93(25):255506. Epub 2004 Dec 16.

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Ductile bulk metallic glass.

Schroers J, Johnson WL.

Keck Laboratory of Engineering Materials, California Institute of Technology, Pasadena, California 91125, USA. schroers@caltech.edu

We report on experimental evidence of pronounced global plasticity measured in monolithic Pt57.5Cu14.7Ni5.3P22.5 bulk metallic glass under both bending and unconfined compression loading conditions. A plastic strain of 20% is measured, never before seen in metallic glasses. Also, permanent deformation and a strain exceeding 3% before failure is observed during bending of 4 mm thick samples. To date, no monolithic metallic material has exhibited such a combination of high strength, extensive ductility, and high elastic limit. The large plasticity is reflected in a high Poisson ratio of 0.42, which causes the tip of a shear band to extend rather than initiate a crack. This results in the formation of multiple shear bands and is the origin of the observed large global ductility and very high fracture toughness, approximately 80 MPa m(-1/2).

PMID: 15697909 [PubMed]

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