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Dispersoid Formation and Stability in Alloys

Abstract

Analysis of dispersoid formation and stability indicates that in-situ formation of an adequate volume fraction of fine particles can be thermodynamically incompatible with stability against high-temperature coarsening. The theory of particle coarsening is extended to include the effects of grain boundaries and dislocations. Theoretical analysis predicts that particle dragging by migrating grain boundaries combined with enhanced coarsening by grain boundary diffusion can give denuded regions near grain boundaries. These predictions of enhanced coarsening and particle dragging are in accord with experimental observations on α-Ti and Ti3Al based alloys.

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Additional information

K.C. Russell received his Ph.D. in metallurgical engineering from the Carnegie Institute of Technology in 1964. He is currently a professor in the Departments of Materials Science and Engineering and Nuclear Engineering at the Massachusetts Institute of Technology. Dr. Russell is also a member of TMS.

F.H. Froes received his Ph.D. in physical metallurgy from the University of Sheffield, England. He is currently Branch Chief, U.S. Air Force Materials Laboratory, Structural Metals Branch, Wright-Patterson Air Force Base, Ohio, Dr. Froes is an adjunct professor at the University of Dayton and Wright State University. He is also a member of TMS.

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Russell, K.C., Froes, F.H. Dispersoid Formation and Stability in Alloys. JOM 40, 29–35 (1988). https://doi.org/10.1007/BF03258938

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Keywords

  • Boundary Diffusion
  • Rapid Solidification
  • Volume Diffusion
  • Oxide Dispersion Strengthen
  • Rapidly Solidify