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An investigation of the fracture and fatigue crack growth behavior of forged damage-tolerant niobium aluminide intermetallics

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Abstract

The results of a recent study of the effects of ternary alloying with Ti on the fatigue and fracture behavior of a new class of forged damage-tolerant niobium aluminide (Nb3Al-xTi) intermetallics are presented in this article. The alloys studied have the following nominal compositions: Nb-15Al-10Ti (10Ti alloy), Nb-15Al-25Ti (25Ti alloy), and Nb-15Al-40Ti (40Ti alloy). All compositions are quoted in atomic percentages unless stated otherwise. The 10Ti and 25Ti alloys exhibit fracture toughness levels between 10 and 20 MPa√m at room temperature. Fracture in these alloys occurs by brittle cleavage fracture modes. In contrast, a ductile dimpled fracture mode is observed at room-temperature for the alloy containing 40 at. pct Ti. The 40Ti alloy also exhibits exceptional combinations of room-temperature strength (695 to 904 MPa), ductility (4 to 30 pct), fracture toughness (40 to 100 MPa√m), and fatigue crack growth resistance (comparable to Ti-6Al-4V, monolithic Nb, and inconnel 718). The implications of the results are discussed for potential structural applications of the 40Ti alloy in the intermediate-temperature (∼700 °C to 750 °C) regime.

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Authors and Affiliations

  1. the Department of Materials Science and Engineering, The Ohio State University, 43210-1179, Columbus, OH

    F. Ye (Postdoctoral Research Fellow), C. MerCer (Postdoctoral Research Fellow) & W. O. Soboyejo (Associate Professor)

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  1. F. Ye
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  2. C. MerCer
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  3. W. O. Soboyejo
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Ye, F., MerCer, C. & Soboyejo, W.O. An investigation of the fracture and fatigue crack growth behavior of forged damage-tolerant niobium aluminide intermetallics. Metall Mater Trans A 29, 2361–2374 (1998). https://doi.org/10.1007/s11661-998-0112-3

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  • DOI: https://doi.org/10.1007/s11661-998-0112-3

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