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Crystallization of Cu60Ti20Zr20 metallic glass with and without pressure

Published online by Cambridge University Press:  06 January 2012

J. Z. Jiang ,
B. Yang ,
K. Saksl ,
H. Franz  and
N. Pryds
J. Z. Jiang
Affiliation:
Department of Physics, Building 307, Technical University of Denmark, DK-2800 Lyngby, Denmark
B. Yang
Affiliation:
Department of Physics, Building 307, Technical University of Denmark, DK-2800 Lyngby, Denmark
K. Saksl
Affiliation:
HASYLAB am DESY, Notkestrasse 85, D-22603 Hamburg, Germany
H. Franz
Affiliation:
HASYLAB am DESY, Notkestrasse 85, D-22603 Hamburg, Germany
N. Pryds
Affiliation:
Materials Research Department, Risø National Laboratory, DK-4000 Roskilde, Denmark
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Abstract

Structural stability of a Cu60Ti20Zr20 metallic glass under pressure up to 4.5 GPa was investigated by x-ray diffraction. The sample exhibited a supercooled liquid region of 33 K and a ratio of the glass-transition temperature to the liquidus temperature of 0.63. The glass crystallized in two-step transformation processes in the pressure range of 0–4.5 GPa; the first was a primary reaction to form a Cu51Zr14-type structure crystalline phase with a spacing group P6/m (175) and lattice parameters a=11.235 Å and c=8.271 Å, and then the residual amorphous phase crystallized into a MgZn2-type structure crystalline phase with a spacing group P63/mmc (194) and lattice parameters a=5.105 Å and c=8.231 Å. Both crystallization temperatures increased with pressure having a slope of 19 K/GPa. The increase of the first crystallization temperature with increasing pressure in the glass can be explained by the suppression of atomic mobility. No significant structural change was detected in the Cu60Ti20Zr20 glass annealed in vacuum at 697 K for 1 h as compared to the as-prepared sample from x-ray diffraction measurements.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 4 , April 2003 , pp. 895 - 898
Copyright
Copyright © Materials Research Society 2003

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