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Strain Rate Induced Amorphization in Metallic Nanowires

Ikeda, Hideyuki and Qi, Yue and Çağin, Tahir and Samwer, Konrad and Johnson, William L. and Goddard, William A., III (1999) Strain Rate Induced Amorphization in Metallic Nanowires. Physical Review Letters, 82 (14). pp. 2900-2903. ISSN 0031-9007. http://resolver.caltech.edu/CaltechAUTHORS:IKEprl99

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Abstract

Using molecular dynamics simulations with a many-body force field, we studied the deformation of single crystal Ni and NiCu random alloy nanowires subjected to uniform strain rates but kept at 300 K. For all strain rates, the Ni nanowire is elastic up to 7.5% strain with a yield stress of 5.5 GPa, far above that of bulk Ni. At high strain rates, we find that for both systems the crystalline phase transforms continuously to an amorphous phase, exhibiting a dramatic change in atomic short-range order and a near vanishing of the tetragonal shear elastic constant perpendicular to the tensile direction. This amorphization which occurs directly from the homogeneous, elastically deformed system with no chemical or structural inhomogeneities exhibits a new mode of amorphization.


Item Type:Article
Additional Information:©1999 The American Physical Society Received 10 September 1998 Financial support was provided by the Japanese Ministry of Education for H.I., by DOE (DEFOG3-86ER45242) for K.S. and W.L.J., by ARO (DAAH04-95-1-0233) for W.L.J. and W.A.G., and by NSF (CHE95-22179 and ACR-92-17368) and DOE-ASCI for Y.Q., T.C., and W.A.G. In addition, the facilities of the MSC are supported by grants from ARO-DURIP, BP Chemical, Exxon, Avery-Dennison, Owens-Corning, ARO-MURI, Asahi Chemical, Chevron Corp., and Beckman Institute.
Record Number:CaltechAUTHORS:IKEprl99
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:IKEprl99
Alternative URL:http://dx.doi.org/10.1103/PhysRevLett.82.2900
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3982
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:21 Jul 2006
Last Modified:18 Sep 2014 18:11

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