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Formation of nanocrystals based on decomposition in the amorphous Zr41.2Ti13.8Cu12.5Ni10Be22.5 alloy

Schneider, S. and Thiyagarajan, P. and Johnson, W. L. (1996) Formation of nanocrystals based on decomposition in the amorphous Zr41.2Ti13.8Cu12.5Ni10Be22.5 alloy. Applied Physics Letters, 68 (4). pp. 493-495. ISSN 0003-6951. http://resolver.caltech.edu/CaltechAUTHORS:SCHNapl96

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Abstract

Primary crystallization and decomposition in the bulk amorphous alloy Ar41.2Ti13.8Cu12.5Ni10Be22.5 have been studied by small angle neutron scattering (SANS), transmission electron microscopy (TEM), and differential scanning calorimetry (DSC). SANS data of samples annealed isothermally at 623 K exhibit an interference peak centered at q=0.46 nm(^-1) after an incubation time of about 100 min. TEM and DSC investigations confirm that the respective periodic variation in the scattering length density is due to the formation of nanocrystals embedded in the amorphous matrix. These observations suggest that during the incubation time a chemical decomposition process occurs and the related periodic composition fluctuations give rise to the observed periodic arrangement of the nanocrystals.


Item Type:Article
Additional Information:Copyright © 1996 American Institute of Physics. Received 20 September 1995; accepted 14 November 1995. We gratefully acknowledge stimulating discussions with U. Geyer, R. Busch, and K. Samwer. The authors also like to thank C. M. Garland for her valuable assistance at the TEM and A. Peker, X. F. Sun, and D. Wozniak for their help. This work was supported by the Department of Energy (Grant No. DE-FG03-86ER45242). It has also benefited from the use of IPNS, which is funded by U.S. DOE, under Contract No. W-31-109-ENG-38 to the University of Chicago.
Subject Keywords:BERYLLIUM ALLOYS; COPPER ALLOYS; DECOMPOSITION; DSC; GRAINS; METALLIC GLASSES; MICROSTRUCTURE; NEUTRON DIFFRACTION; NICKEL ALLOYS; PHASE SEPARATION; TEM; TITANIUM ALLOYS; ZIRCONIUM ALLOYS
Record Number:CaltechAUTHORS:SCHNapl96
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:SCHNapl96
Alternative URL:http://dx.doi.org/10.1063/1.116377
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2969
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:09 May 2006
Last Modified:26 Dec 2012 08:51

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