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Grain Size Control
by T. Gladman
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Amazon.com Product Description (ISBN 0970414382, Paperback)Grain Size Control reviews significant developments in the understanding of solid state grain size control over the past half century, to provide an advanced text for materials science students and practitioners. Major developments in the understanding of the nature of grain boundaries and grain growth have been obtained from newly developed techniques. 50 years ago there was considerable speculation on the precise nature of a grain boundary. Now, with high-resolution electron microscopy, the atomic locations across a grain boundary can be imaged. In this development and in the general formulation of grain boundary energy and grain growth, the introduction of computers has played an important role.
50 years ago, Zener had already formulated his relationship of the inhibiting influence of fine particles on grain growth. The derivation of the Zener relationship is presented here, together with the refinements that have been introduced as a result of our increased understanding of granular arrays and the importance of irregularities in such arrays. The important effects of particle size and volume fraction are illustrated with applications drawn from the author’s experiences with ferrous materials.
The importance of particle solubility and of Ostwald ripening is emphasised, as any inadequacy in volume fraction and particle size can lead to abnormal grain growth. Consideration is also given to the grain growth inhibiting effect of thermally etched grooves operating in thin strip and foils, when free surface energy effects become more important than grain boundary energy.
Exercises are given at the end of relevant chapters to enable the reader to calculate particle requirements and how these are attained in practice. Worked answers are given at the end of the book. This is an exciting and developing field and is relevant to virtually all poly-crystalline materials, whether the requirement is for the maintenance of very fine grain sizes, or the development of extremely coarse grain sizes.
(retrieved from Amazon Mon, 31 Aug 2015 06:05:17 -0400)
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