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An investigation of the fatigue and fracture behavior of mn-containing gamma titanium aluminides

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Abstract

The fatigue and fracture mechanisms in Ti-48Al-xMn (x = 1.4 to 2.0 at. pct) gamma-based titanium aluminide alloys are elucidated. Unlike most gamma alloys, which fail predominantly by transgranular fracture at room temperature, fracture in ternary Ti-48Al-xMn alloys is shown to occur mainly by intergranular failure. The incidence of intergranular failure increased with increasing annealing duration and temperature. Intergranular fracture is shown to occur as a result of the segregation of Mn to equiaxed and interlamellar boundaries. Annealing either above or below the eutectoid temperature results in the precipitation of α2 particles. The reduction in the strength and toughness of ternary Mn-containing alloys is attributed to the combined effects of segregation and α2 precipitation. A micromechanics framework is presented for the assessment of twin toughening mechanisms under monotonie and cyclic loading.

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Author information

Authors and Affiliations

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

    W. O. Soboyejo (Assistant Professor) & C. Mercer (Graduate Research Assistant)

  2. Union College, 12301, Schenectady, NY

    K. Lou (Assistant Professor)

  3. AGA Gas Company, S-181 31, Lidingo, Sweden

    S. Heath (Engineer)

Authors
  1. W. O. Soboyejo
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  2. C. Mercer
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  3. K. Lou
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  4. S. Heath
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Additional information

Formerly Staff Scientist with General Electric Research and Development, Schenectady, NY 12301

Formerly Undergraduate Student, Department of Materials Science and Engineering, The Ohio State University

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Soboyejo, W.O., Mercer, C., Lou, K. et al. An investigation of the fatigue and fracture behavior of mn-containing gamma titanium aluminides. Metall Mater Trans A 26, 2275–2291 (1995). https://doi.org/10.1007/BF02671243

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  • DOI: https://doi.org/10.1007/BF02671243

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