Phys. Rev. Lett. 93, 255506 (2004) [4 pages]

Ductile Bulk Metallic Glass

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Jan Schroers1,2 * and William L. Johnson1
1Keck Laboratory of Engineering Materials, California Institute of Technology, Pasadena, California 91125, USA
2Liquidmetal Technologies, Lake Forest, California 92630, USA

Received 2 August 2004; published 16 December 2004

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.


©2004 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.93.255506
DOI: 10.1103/PhysRevLett.93.255506
PACS: 81.05.Kf, 62.20.Fe, 81.05.Zx, 83.60.Rs

* Corresponding author. Electronic address: schroers@caltech.edu

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