Abstract
Diffusion along microstructural defects, such as grain boundaries or dislocation pipes, is significantly faster than diffusion through an undisturbed crystal. The ratio of diffusion enhancement is 3-4 orders of magnitude close to the melting point and reaches up to several ten orders of magnitude close to room temperature. An assessment of literature shows a large scatter in the available data and emphasizes the need for representative mean values. Applying a least mean square fit to selected experimental information delivers temperature-dependent functions for the ratio of grain boundary and dislocation pipe to bulk diffusion, respectively. We demonstrate that application of the attained results in a computational framework for the kinetics of precipitation makes the predictive simulation possible for the evolution of particles located at dislocations and grain boundaries.
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Acknowledgment
Financial support by the Austrian Federal Government (in particular from the Bundesministerium für Verkehr, Innovation und Technologie and the Bundesministerium für Wirtschaft, Familie und Jugend) and the Styrian Provincial Government, represented by Österreichische Forschungsförderungsgesellschaft mbH and by Steirische Wirtschaftsförderungsgesellschaft mbH, within the research activities of the K2 Competence Centre on “Integrated Research in Materials, Processing and Product Engineering,” operated by the Materials Center Leoben Forschung GmbH in the framework of the Austrian COMET Competence Centre Programme, is gratefully acknowledged.
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This article is an invited submission to JMEP selected from presentations at the Symposia “Wetting,” “Interface Design,” and “Joining Technologies’’ belonging to the Topic “Joining and Interface Design” at the European Congress and Exhibition on Advanced Materials and Processes (EUROMAT 2013), held September 8-13, 2013, in in Sevilla, Spain, and has been expanded from the original presentation.
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Stechauner, G., Kozeschnik, E. Self-Diffusion in Grain Boundaries and Dislocation Pipes in Al, Fe, and Ni and Application to AlN Precipitation in Steel. J. of Materi Eng and Perform 23, 1576–1579 (2014). https://doi.org/10.1007/s11665-014-0921-z
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DOI: https://doi.org/10.1007/s11665-014-0921-z