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Alloying Effects and Grain-Boundary Fracture in L12 Ordered Intermetallics

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Book cover Ordered Intermetallics — Physical Metallurgy and Mechanical Behaviour

Part of the book series: NATO ASI Series ((NSSE,volume 213))

Abstract

This article involves a number of studies on the alloying effects on intergranular fracture of L12 ordered intermetallics, and demonstrates that their ductility strongly depends upon atomistic composition and associated crystal and electronical structures at grain boundaries. Component atoms with large size, which occupy anti-structure site and disordered sites, and their preferential sites as third (or quaternary atoms), are shown to influence the grain boundary strength and fracture behavior in moderate levels of additions. Addition of interstitial atoms such as boron, carbon and beryllium with small size is extremely effective to enhance or to reduce the grain boundary cohesive strength in trace amount of levels in matrix but in highly enriched levels at grain boundaries. Also, gaseous hydrogen atoms with small size, which is mobile and penetrated from environment at room temperature, are shown to dynamically reduce the grain boundary strength, resulting in the environmental embrittlement. It is suggested that the grain boundary strength and therefore ductility of L12 ordered intermetallics can be controlled by compositions of components and interstitials, state of ordering and prohibition of penetration of hydrogen.

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Authors and Affiliations

  1. Institute for Materials Research, Tohoku University, Katahira 2-1-1, Sendai 980, Japan

    T. Takasugi

  2. Tohoku University, Katahira 2-1-1, Sendai 980, Japan

    O. Izumi (Professor Emeritus of Tohoku University)

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  1. T. Takasugi
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  2. O. Izumi
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Editors and Affiliations

  1. Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA

    C. T. Liu

  2. Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, UK

    R. W. Cahn

  3. Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Deutschland

    G. Sauthoff

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Takasugi, T., Izumi, O. (1992). Alloying Effects and Grain-Boundary Fracture in L12 Ordered Intermetallics. In: Liu, C.T., Cahn, R.W., Sauthoff, G. (eds) Ordered Intermetallics — Physical Metallurgy and Mechanical Behaviour. NATO ASI Series, vol 213. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2534-5_25

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  • DOI: https://doi.org/10.1007/978-94-011-2534-5_25

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