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In situ straining: crack development in thin foils of Ni3Al

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Abstract

Foils of stoichiometric Ni3Al were deformedin situ in a transmission electron microscope. Under plane stress conditions the crack propagated along slip planes, i.e. along {1 1 1} planes. This is in contrast to the intergranular fracture mode of bulk material. In the direction of the crack path, directly in front of the crack tip (but in the plastic zone), inverse dislocation pileups developed during straining. These dislocations are screw dislocations with Burgers vectorsb=a〈110〉 andb=a/2〈110〉, respectively. Owing to their extremely low Peierls stresses, these dislocations are highly mobile on {1 1 1} planes. Because the slip plane of these screw dislocations is coplanar to the crack plane, the plastic part of the crack development corresponds to shear cracking of the mode III type. Calculation of the local stress intensity factor,k IC, confirmed that cleavage fracture occurs in mode I deformation, which is typical of the crack characteristics of Ni3Al foils. Crack behaviour of Ni3Al is similar to that of simple b c c metals because of the comparable relations of thek values.

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  1. R. Maurer

    Present address: Baden-Württembergischer Handwerkstag e.V., Heilbronner Strasse 43, Stuttgart, Germany

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  1. Max-Planck Institut für Metallforschung, Seestraße 92, D-7000, Stuttgart, Germany

    R. Maurer

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Maurer, R. In situ straining: crack development in thin foils of Ni3Al. J Mater Sci 27, 6279–6290 (1992). https://doi.org/10.1007/BF00576273

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