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Microcantilever bending experiments in NiAl - Evaluation, size effects, and crack tip plasticity

Ast, J. and Przybilla, T. and Maier, V. and Durst, Karsten and Göken, M. (2014):
Microcantilever bending experiments in NiAl - Evaluation, size effects, and crack tip plasticity.
In: Journal of Materials Research, Cambridge University Press, pp. 2129-2140, 29, (18), ISSN 0884-2914,
[Online-Edition: https://doi.org/10.1557/jmr.2014.240],
[Article]

Abstract

For a better understanding of the local fracture behavior of semi-brittle materials, we carried out bending experiments on notched microcantilevers of varying sizes in the micrometer range using NiAl single crystals. Smaller and larger beams were milled with a focused ion beam in the so-called “soft” <110> and “hard” <100> orientation and were tested in situ in a scanning electron microscope and ex situ with a nanoindenter, respectively. The measurements were evaluated using both linear-elastic fracture mechanics and elastic–plastic fracture mechanics. The results show that (i) the fracture toughness is in the same range as the macroscopically determined one which is around 3.5 MPa for the soft orientation and around 8.5 MPa for the hard orientation, that (ii) there is a strong influence of the anisotropic behavior of NiAl on the fracture toughness values, and that (iii) the J-integral technique is the most accurate quantification method.

Item Type: Article
Erschienen: 2014
Creators: Ast, J. and Przybilla, T. and Maier, V. and Durst, Karsten and Göken, M.
Title: Microcantilever bending experiments in NiAl - Evaluation, size effects, and crack tip plasticity
Language: English
Abstract:

For a better understanding of the local fracture behavior of semi-brittle materials, we carried out bending experiments on notched microcantilevers of varying sizes in the micrometer range using NiAl single crystals. Smaller and larger beams were milled with a focused ion beam in the so-called “soft” <110> and “hard” <100> orientation and were tested in situ in a scanning electron microscope and ex situ with a nanoindenter, respectively. The measurements were evaluated using both linear-elastic fracture mechanics and elastic–plastic fracture mechanics. The results show that (i) the fracture toughness is in the same range as the macroscopically determined one which is around 3.5 MPa for the soft orientation and around 8.5 MPa for the hard orientation, that (ii) there is a strong influence of the anisotropic behavior of NiAl on the fracture toughness values, and that (iii) the J-integral technique is the most accurate quantification method.

Journal or Publication Title: Journal of Materials Research
Volume: 29
Number: 18
Publisher: Cambridge University Press
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy
Date Deposited: 18 Jul 2018 14:21
Official URL: https://doi.org/10.1557/jmr.2014.240
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