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Toughening mechanisms in titanium aluminides

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Abstract

The relevant toughening mechanisms in two-phase titanium aluminides are reviewed in order to elucidate microstructure/fracture toughness relationships. Both intrinsic and extrinsic toughening mechanisms are present in Ti3Al- and TiAl-base alloys. The former affects the initiation toughness(i.e., K IC value) at the onset of crack extension, while the latter leads to crack growth toughness by instigating a resistance-curve behavior. Intrinsic toughening arises from matrix slip and ductile-phase blunting. In contrast, extrinsic toughening originates from crack deflection, ductile-phase bridging, shear ligament toughening, microcrack shielding, twin toughening, and the growing crack singularity. The influence of microstructure on toughening mechanisms in two-phase Ti3Al- and TiAl-base alloys is discussed, with particular emphasis on the need to control the microstructure in order to achieve the desired mechanical properties.

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  1. Materials and Mechanics Department, Engineering and Materials Sciences Division, Southwest Research Institute, 78228-0510, San Antonio, TX

    K. S. Chan (Staff Scientist)

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This article is based on a presentation made in the symposium “Quasi-Brittle Fracture” presented during the TMS fall meeting, Cincinnati, OH, October 21–24, 1991, under the ausprices of the TMS Mechanical Metallurgy Committee and the ASM/MSD Flow and Fracture Committee.

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Chan, K.S. Toughening mechanisms in titanium aluminides. Metall Trans A 24, 569–583 (1993). https://doi.org/10.1007/BF02656627

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