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Stability of the Pd-Co-Ni-Cu-P Metallic Glasses

Published online by Cambridge University Press:  01 February 2011

Daisuke Fukamaki
Affiliation:
fukamaki@mizu.xtal.nagoya-u.ac.jp, Nagoya University, Applied Physics, Furouchou Chikusaku, Nagoya, 464-0843, Japan, +10-81-52-789-3822
Tsunehiro Takeuchi
Affiliation:
takeuchi@nuap.nagoya-u.ac.jp, Nagoya University, Department of Applied Physics, Nagoya, 464-0843, Japan
Masashi Hasegawa
Affiliation:
hasegawa@numse.nagoya-u.ac.jp, Nagoya University, Department of Materials Science and Engineering, Nagoya, 464-8601, Japan
Kazuo Soda
Affiliation:
k-soda@nucl.nagoya-u.ac.jp, Nagoya University, Department of Quantum Mechanics Engineering, Nagoya, 464-8601, Japan
Hirokazu Sato
Affiliation:
hsato@auecc.aichi-edu.ac.jp, Aichi University of Education, Department of Physics, Kariya, 448-8542, Japan
Uichiro Mizutani
Affiliation:
riken-mizutani@mosk.tytlabs.co.jp, Toyota Physical and Chemical Research Institute, Nagakute, 480-1192, Japan
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Abstract

Stability of Pd-Co-Ni-Cu-P metallic glass was investigated in terms of free energy using first principle cluster calculations, thermal analysis, and photoemission spectroscopy measurements. We found that the internal energy of the Pd-based metallic glasses is dominated by the electronic structure near the Fermi level. The analyses on the electronic structure and local atomic arrangements indicate that the substitution of cobalt or a hypothetical atom Co0.5Cu0.5 for nickel in the Pd40Ni40P20 metallic glass decreases the free energy of the Pd-Ni-P metallic glass by increasing entropy without altering significantly internal energy. On the basis of the idea mentioned above, we prepared Pd28Co24Ni24P24, Pd25Co25Ni25P25 and Pd40Co40/3Ni40/3Cu40/3P20 metallic glasses. These metallic glasses certainly showed the nearly highest T X, which directly reflect the activation energy against crystallization, among the Pd-based metallic glasses ever reported.

Type
Research Article
Copyright
Copyright © Materials Research Society 2008

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