TY - JOUR
T1 - Dual-phase glassy/nanoscale icosahedral phase materials in Cu-Zr-Ti-Pd system alloys
AU - Louzguine-Luzgin, Dmitri V.
AU - Churyumov, A. Yu
N1 - Funding Information:
This work was supported by the World Premier International Research Center Initiative (WPI) , MEXT , Japan and by the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST “MISiS” (No. К2-2014-013 ).
PY - 2014/10
Y1 - 2014/10
N2 - The present work is devoted to an investigation of the formation kinetics, stability and homogeneity area of the nanoscale icosahedral phase formed on heating in the dual-phase glassy/quasicrystalline phase Cu-Zr-Ti-Pd alloys. The data obtained indicate that the Cu-Zr-Ti-Pd icosahedral phase is not a Cu-rich part of the compositional homogeneity area of the Zr-Cu-Pd one. Moreover, Ti, as well as Pd, is found to be an important element stabilizing quasicrystalline phase in the Cu-Zr-Ti-Pd alloys. The formation criteria for Cu- and Zr/Hf-based icosahedral phases are discussed based on the quasilattice constant to average atomic diameter ratio. Deviation from a certain ratio leads to destabilization of the icosahedral phase. By using the isothermal calorimetry traces transformation kinetics above and below the glass-transition region was analyzed. Some difference in the transformation kinetics above and below the glass-transition region allows us to suggest that possible structure changes occur upon glass-transition.
AB - The present work is devoted to an investigation of the formation kinetics, stability and homogeneity area of the nanoscale icosahedral phase formed on heating in the dual-phase glassy/quasicrystalline phase Cu-Zr-Ti-Pd alloys. The data obtained indicate that the Cu-Zr-Ti-Pd icosahedral phase is not a Cu-rich part of the compositional homogeneity area of the Zr-Cu-Pd one. Moreover, Ti, as well as Pd, is found to be an important element stabilizing quasicrystalline phase in the Cu-Zr-Ti-Pd alloys. The formation criteria for Cu- and Zr/Hf-based icosahedral phases are discussed based on the quasilattice constant to average atomic diameter ratio. Deviation from a certain ratio leads to destabilization of the icosahedral phase. By using the isothermal calorimetry traces transformation kinetics above and below the glass-transition region was analyzed. Some difference in the transformation kinetics above and below the glass-transition region allows us to suggest that possible structure changes occur upon glass-transition.
KW - Bulk metallic glasses
KW - Differential scanning calorimetry
KW - Quasicrystals
KW - Transmission electron microscopy
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U2 - 10.1016/j.matchar.2014.07.014
DO - 10.1016/j.matchar.2014.07.014
M3 - Article
AN - SCOPUS:84905041842
VL - 96
SP - 6
EP - 12
JO - Materials Characterization
JF - Materials Characterization
SN - 1044-5803
ER -