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Ductile Bulk Metallic Glass

Schroers, Jan and Johnson, William L. (2004) Ductile Bulk Metallic Glass. Physical Review B, 93 (25). Art. No. 255506. ISSN 0031-9007. http://resolver.caltech.edu/CaltechAUTHORS:SCHRprl04

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Abstract

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.


Item Type:Article
Additional Information:©2004 The American Physical Society (Received 2 August 2004; published 16 December 2004) We thank Professor William D. Nix, Dr. R. Dale Conner, Professor Ralf Busch, and Dr. Theodore A. Waniuk for very helpful discussions.
Subject Keywords:platinum alloys; copper alloys; nickel alloys; phosphorus alloys; metallic glasses; fracture toughness; bending; ductility; Poisson ratio
Record Number:CaltechAUTHORS:SCHRprl04
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:SCHRprl04
Alternative URL:http://dx.doi.org/10.1103/PhysRevLett.93.255506
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8542
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:17 Aug 2007
Last Modified:26 Dec 2012 09:39

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