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Evaluation of fracture toughness of alpha-Nb5Si3 by micro-sized cantilever beam testing

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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 KQ is 3.45 ± 0.29 MPa√m under a small-scale yielding condition.

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Acknowledgements

Authors are grateful to Prof. K. Takashima (Kumamoto University, Japan) for helpful discussions and to Mr. T. Endo (Hokkaido University, Japan) and Ms. A. Watanabe Fig. 5 The fracture toughness of alphaNb5Si3 with different crystallographic orientation of notch plane. See Table 1 for the details of the specimen group. (National Institute for Materials Science, Tsukuba, Japan) for their technical assistance.

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Authors and Affiliations

  1. Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University, Japan

    Shiori Suzuki Graduate student & Seiji Miura

  2. National Institute for Materials Science, Japan

    Nobuaki Sekido & Takahito Ohmura

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  1. Shiori Suzuki Graduate student
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  2. Nobuaki Sekido
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  3. Takahito Ohmura
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  4. Seiji Miura
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Suzuki, S., Sekido, N., Ohmura, T. et al. Evaluation of fracture toughness of alpha-Nb5Si3 by micro-sized cantilever beam testing. MRS Online Proceedings Library 1760, 187–192 (2014). https://doi.org/10.1557/opl.2015.147

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