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Evaluationof fracture toughness ofalpha-Nb5Si3 by micro-sized cantilever beam testing

Published online by Cambridge University Press:  18 February 2015

Shiori Suzuki
Affiliation:
Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University
Nobuaki Sekido
Affiliation:
National Institute for Materials Science
Takahito Ohmura
Affiliation:
National Institute for Materials Science
Seiji Miura
Affiliation:
Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University
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Abstract

A micro-sized fracture testing method has been applied to investigate fracture toughness of alpha-Nb5Si3. Chevron-notched single crystal specimens with a size of 3 x 3 x 15 μm3 were prepared in a grain of polycrystalline alpha-Nb5Si3 by focused ion beam, FIB, technique. Fracture tests were conducted using a nanoindenter at room temperature and linear load-displacement curves and smooth fracture surfaces were obtained. This fracture behavior was presumed to be brittle fracture similar to bulk alpha-Nb5Si3. The average of fracture toughness K Q is 3.45 ± 0.29 MPa√m under a small-scale yielding condition.

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Copyright © Materials Research Society 2015 

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