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

Ast J, Przybilla T, Maier V, Durst K, Göken M (2014)


Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2014

Journal

Publisher: Cambridge University Press

Book Volume: 29

Pages Range: 2129-2140

Journal Issue: 18

DOI: 10.1557/jmr.2014.240

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/m for the soft orientation and around 8.5 MPa/m 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.

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APA:

Ast, J., Przybilla, T., Maier, V., Durst, K., & Göken, M. (2014). Microcantilever bending experiments in NiAl - Evaluation, size effects, and crack tip plasticity. Journal of Materials Research, 29(18), 2129-2140. https://dx.doi.org/10.1557/jmr.2014.240

MLA:

Ast, Johannes, et al. "Microcantilever bending experiments in NiAl - Evaluation, size effects, and crack tip plasticity." Journal of Materials Research 29.18 (2014): 2129-2140.

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