Author
Gary R. Purdy
Bio: Gary R. Purdy is an academic researcher from Royal Institute of Technology. The author has contributed to research in topics: Grain boundary diffusion coefficient & Thermal diffusivity. The author has an hindex of 1, co-authored 1 publications receiving 311 citations.
Papers
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TL;DR: In this paper, it was shown that gram boundary motion can be induced by changing the composition by means of grain boundary diffusion, and the experimental results can be used to evaluate rather directly the grain boundary diffusivity and mobility.
323 citations
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18 Mar 2013
483 citations
TL;DR: In this paper, the authors proposed a mechanism in which differences in the diffusion coefficients of the diffusing species along the grain boundary cause a self-sustaining climb of grain boundary dislocations and motion of their associated grain boundary steps.
286 citations
TL;DR: In this paper, the Gibbs energy dissipation approach is applied to the solute drag approach to phase transformations and applied to a wedge-shaped description of the properties of the interface, a very flexible treatment is obtained but it is difficult to decide how to choose the model parameters.
237 citations
TL;DR: In this article, a review of the GB kinetics literature is provided, and the authors draw comparisons from a wide swath of the extant experimental, simulation, and theoretical GB kinetic behavior literature.
223 citations
01 Dec 1982-Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science
TL;DR: In this article, the authors reviewed the current knowledge of the atomistic mechanisms responsible for grain boundary diffusion phenomena and concluded that the atomic migration occurs by a point defect exchange mechanism which, in at least the vast majority of boundaries in simple metals, most likely involves grain boundary vacancies.
Abstract: In recent years it has become well established that fast diffusion along grain boundaries plays a key role in many important metallurgical processes including cases where net mass is transported along boundaries which act as sources and/or sinks for the fluxes of atoms. In addition, considerable advances have been made in understanding grain boundary structure, and new techniques have become available for studying kinetic phenomena in grain boundaries. This lecture will attempt to review our current knowledge of the atomistic mechanisms responsible for these grain boundary diffusion phenomena. Relevant aspects of the structure of grain boundaries and the point and line defects which may exist in grain boundaries are described first. The important experimental observations are then discussed. Diffusion models are then taken up, and it is concluded that the atomic migration occurs by a point defect exchange mechanism which, in at least the vast majority of boundaries in simple metals, most likely involves grain boundary vacancies. The grain boundary sources and/or sinks required to support divergences in the atomic (vacancy) fluxes are grain boundary dislocations. Phenomena therefore occur which resemblethe Kirkendall Effect in the bulk lattice in certain respects. Additional topics are discussed which include effects of boundary structure on boundary diffusion and the question of whether or not boundary diffusion is faster along migrating than stationary boundaries.
191 citations