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Indentation study of titanium, zirconium, and hafnium hydrides

Published online by Cambridge University Press:  01 February 2011

Masato Ito ,
Shunichiro Nishioka ,
Hiroaki Muta ,
Ken Kurosaki ,
Masayoshi Uno  and
Shinsuke Yamanaka
Masato Ito
Affiliation:
ito@ms.see.eng.osaka-u.ac.jp, Graduate School of Engineering, Osaka University, Division of Sustainable Energy and Environmental Engineering, 2-1 Yamada-oka, Suita, 565-0871, Japan, +81-6-6879-7905, +81-6-6879-7889
Shunichiro Nishioka
Affiliation:
nishioka@ms.see.eng.osaka-u.ac.jp, Graduate School of Engineering, Osaka University, Division of Sustainable Energy and Environmental Engineering, 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan
Hiroaki Muta
Affiliation:
muta@see.eng.osaka-u.ac.jp, Graduate School of Engineering, Osaka University, Division of Sustainable Energy and Environmental Engineering, 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan
Ken Kurosaki
Affiliation:
kurosaki@see.eng.osaka-u.ac.jp, Graduate School of Engineering, Osaka University, Division of Sustainable Energy and Environmental Engineering, 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan
Masayoshi Uno
Affiliation:
uno@see.eng.osaka-u.ac.jp, Graduate School of Engineering, Osaka University, Division of Sustainable Energy and Environmental Engineering, 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan
Shinsuke Yamanaka
Affiliation:
yamanaka@see.eng.osaka-u.ac.jp, Graduate School of Engineering, Osaka University, Division of Sustainable Energy and Environmental Engineering, 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan
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Abstract

Mechanical properties of titanium, zirconium, and hafnium hydrides were evaluated by indentation tests in the present study. Single-phase bulk specimens of titanium, zirconium, and hafnium hydrides with a fluorite type structure were produced using a Sieverts' apparatus. The indentation hardness values of titanium and hafnium hydrides were lower than those of the pure metals and drastically decreased with increasing hydrogen content. The hardness of zirconium hydride was higher than that of pure zirconium and slightly depended on hydrogen content. The hardness of the hydrides decreased with increasing maximum indentation load, which has been referred to as indentation size effect. The dependences of hardness on the indentation depth for the hydrides were found to obey the Nix–Gao model. The indentation size effects for the hydrides were significantly smaller than those for the pure metals.

Keywords

hardnessHelastic properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1043: Symposium T – Materials Innovations for Next-Generation Nuclear Energy , 2007 , 1043-T09-11
Copyright
Copyright © Materials Research Society 2008

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