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Formation of Grain Boundary α in β Ti Alloys: Its Role in Deformation and Fracture Behavior of These Alloys

  • Symposium: Structural Transitions and Local Deformation Processes at and near Grain Boundaries
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Abstract

Beta-Ti alloys contain sufficient concentrations of β stabilizing alloy additions to permit retention of the metastable β phase after cooling to room temperature. Decomposition of the metastable β phase results in the formation of several possible phases, at least two of which are metastable. Concurrently, equilibrium α phase often forms first by heterogeneous nucleation at the α grain boundaries with an accompanying precipitate free zone observed adjacent to the grain boundary α. The grain boundary regions are softer than the precipitation hardened matrix. As a consequence, fracture follows the prior β grain boundaries, especially in high-strength conditions. This fracture mode results in low tensile ductility and/or fracture toughness. This article will describe methods of minimizing or eliminating grain boundary α formation by using metastable transition precipitates to nucleate α more rapidly. The effects on fracture behavior also will be described.

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Acknowledgments

Support for this work is gratefully acknowledged from the U.S. Office of Naval Research D3-D program, Grant. N00014-05-1-0504. The authors would like to thank Adam Pilchak for his valuable discussions.

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Authors and Affiliations

  1. The Ohio State University, Columbus, OH, 43210, USA

    John W. Foltz (Graduate Research Associate), Brian Welk (Research Scientist), Hamish L. Fraser (Ohio Regents Eminent Scholar) & James C. Williams (Professor)

  2. Quad Cities Manufacturing Laboratory, Arsenal Rock Island, Moline, IL, 61201, USA

    Peter C. Collins (Director of Technology)

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  1. John W. Foltz
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  2. Brian Welk
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  3. Peter C. Collins
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  4. Hamish L. Fraser
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  5. James C. Williams
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Correspondence to John W. Foltz.

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Manuscript submitted January 8, 2010.

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Foltz, J.W., Welk, B., Collins, P.C. et al. Formation of Grain Boundary α in β Ti Alloys: Its Role in Deformation and Fracture Behavior of These Alloys. Metall Mater Trans A 42, 645–650 (2011). https://doi.org/10.1007/s11661-010-0322-3

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  • DOI: https://doi.org/10.1007/s11661-010-0322-3

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