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Evidence of shear ligament toughening in TiAl-base alloys

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Abstract

Shear ligament toughening is a process by which fracture resistance of a material is enhanced as the result of the redundant deformation and shear fracture of intact ligaments that are formed in the crack wake. A recent micromechanical model has suggested that shear ligament toughening is responsible for the resistance-curve fracture behavior observed in lamellar TiAl-base alloys. In this article, various aspects of the shear ligament-toughening mechanism are evaluated by performing critical experiments. Experimental evidence supporting the presence of shear ligament toughening in TiAl-base alloys is presented together with a quantitative comparison of the proposed model against experimental data. Both the experimental results and model calculations indicate that the resistance-curve fracture behavior in lamellar TiAl-base alloys is indeed a manifestation of shear ligament toughening.

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

    Kwai S. Chan (Staff Scientist)

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  1. Kwai S. Chan
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Chan, K.S. Evidence of shear ligament toughening in TiAl-base alloys. Metall Mater Trans A 26, 1407–1418 (1995). https://doi.org/10.1007/BF02647591

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