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Title: Model for decomposition and nanocrystallization of deeply undercooled Zr{sub 41.2}Ti{sub 13.8}Cu{sub 12.5}Ni{sub 10}Be{sub 22.5}

Abstract

From in situ small-angle neutron scattering performed at temperatures in the undercooled liquid regime, we derive a model for the crystallization pathway of Zr{sub 41.2}Ti{sub 13.8}Cu{sub 12.5}Ni{sub 10}Be{sub 22.5} (Vit1). Vit1 first decomposes on the nanometer scale, increasing drastically the nucleation probability. In the later stages nanocrystallization occurs in one of the decomposed amorphous phases. The growth kinetics of the nanocrystals corresponds to a chemical relaxation process in which they equilibrate with the remaining amorphous matrix. Based on our model, a chemical diffusion constant is derived whose temperature dependence follows an Arrhenius law and is comparable with the expected self-diffusion constant of Ti in Vit1, as determined in independent studies of diffusion. (c) 2000 American Institute of Physics.

Authors:
 [1];  [1]
  1. W. M. Keck Laboratory, California Institute of Technology, Pasadena, California 91125 (United States)
Publication Date:
OSTI Identifier:
20216506
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 76; Journal Issue: 23; Other Information: PBD: 5 Jun 2000; Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ZIRCONIUM ALLOYS; TITANIUM ALLOYS; COPPER ALLOYS; NICKEL ALLOYS; BERYLLIUM ALLOYS; CRYSTALLIZATION; NEUTRON DIFFRACTION; SMALL ANGLE SCATTERING; NUCLEATION; DECOMPOSITION; SELF-DIFFUSION; ARRHENIUS EQUATION; EXPERIMENTAL DATA

Citation Formats

Loeffler, Joerg F., and Johnson, William L. Model for decomposition and nanocrystallization of deeply undercooled Zr{sub 41.2}Ti{sub 13.8}Cu{sub 12.5}Ni{sub 10}Be{sub 22.5}. United States: N. p., 2000. Web. doi:10.1063/1.126657.
Loeffler, Joerg F., & Johnson, William L. Model for decomposition and nanocrystallization of deeply undercooled Zr{sub 41.2}Ti{sub 13.8}Cu{sub 12.5}Ni{sub 10}Be{sub 22.5}. United States. doi:10.1063/1.126657.
Loeffler, Joerg F., and Johnson, William L. Mon . "Model for decomposition and nanocrystallization of deeply undercooled Zr{sub 41.2}Ti{sub 13.8}Cu{sub 12.5}Ni{sub 10}Be{sub 22.5}". United States. doi:10.1063/1.126657.
@article{osti_20216506,
title = {Model for decomposition and nanocrystallization of deeply undercooled Zr{sub 41.2}Ti{sub 13.8}Cu{sub 12.5}Ni{sub 10}Be{sub 22.5}},
author = {Loeffler, Joerg F. and Johnson, William L.},
abstractNote = {From in situ small-angle neutron scattering performed at temperatures in the undercooled liquid regime, we derive a model for the crystallization pathway of Zr{sub 41.2}Ti{sub 13.8}Cu{sub 12.5}Ni{sub 10}Be{sub 22.5} (Vit1). Vit1 first decomposes on the nanometer scale, increasing drastically the nucleation probability. In the later stages nanocrystallization occurs in one of the decomposed amorphous phases. The growth kinetics of the nanocrystals corresponds to a chemical relaxation process in which they equilibrate with the remaining amorphous matrix. Based on our model, a chemical diffusion constant is derived whose temperature dependence follows an Arrhenius law and is comparable with the expected self-diffusion constant of Ti in Vit1, as determined in independent studies of diffusion. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.126657},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 23,
volume = 76,
place = {United States},
year = {2000},
month = {6}
}