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Grain Refinement and Grain Size Control in Superplastic Forming

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Summary

Fine grain size is a microstructural requirement for superplastic alloys. We now have a general understanding of the methods of grain refinement and of restriction of grain coarsening. Phase transformation, recrystallation, deformation of duplex microstructures, and phase separation in duplex alloys can produce grain refinement, while particle dispersions and partitioning in duplex microstructures are useful methods for restricting grain coarsening. The methods selected for grain refinement and grain coarsening control for a specific alloy depend on the character of the alloy. Application of several of these methods to grain refinement and grain coarsening control in high-strength aluminum alloys is discussed.

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Authors and Affiliations

  1. Rockwell International Science Center, 91360, Thousand Oaks, California

    John A. Wert (metallurgist)

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  1. John A. Wert
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Editor’s Note: This paper originally appeared as “Grain Refinement and Grain Size Control” in Superplastic Forming of Structural Alloys, edited by N. E. Paton and C. H. Hamilton, The Metallurgical Society of AIME, Warrendale, Pennsylvania. Copyright 1982.

Dr. Wert obtained a BS in physics from Cornell University and an MS and PhD in materials science from the University of California, Berkeley. He has published several papers in the areas of precipitation in aluminum and iron base alloys, recrystallization, and superplasticity in various alloys. At Rockwell his primary interests have been recrystallization of aluminum alloys for grain refinement, as well as investigation of room temperature properties and superplasticity after grain refinement. Dr. Wert is a member of The Metallurgical Society of AIME.

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Wert, J.A. Grain Refinement and Grain Size Control in Superplastic Forming. JOM 34, 35–41 (1982). https://doi.org/10.1007/BF03338094

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