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Effect of deformation temperature on fatigue and fracture behavior in TiAl polysynthetically twinned crystals

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Abstract

The temperature and orientation dependence of cyclic deformation, fatigue life, and fracture behavior in TiAl polysynthetically twinned (PST) crystals were investigated, focusing on the change of plastic strain energy and deformation mode in the γ domains. Stress-controlled fatigue tests were performed at 1 or 10 Hz using the same stress amplitude in tension and compression (R=−1) over a temperature range from −196 °C to 700 °C. The fatigue strength at ϕ=45 deg (ϕ being the angle between the loading axis and lamellar planes) decreased monotonically with increasing temperature. At ϕ=0 deg, the fatigue strength was high up to 500 °C, but the fatigue life decreased rapidly above 600°C because of dynamic recovery and interlamellar separation. The plastic strain energy—stress amplitude curves in specimens fatigued with ϕ=45 deg increased monotonically with stress amplitude for all temperatures and for higher temperatures with ϕ=0 deg. At 25 °C and −196 °C with ϕ=0 deg, three regions in the plastic strain energy—stress amplitude curves were observed. This anomalous change in the plastic strain energy at lower temperatures was due to a transition in primary deformation mode between twinning and slip by ordinary dislocations in some domain orientations.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Faculty of Engineering, Osaka University, 565-0871, Osaka, Japan

    Y. Umakoshi (Professor), H. Y. Yasuda (Research Associate), T. Nakano (Research Associate) & K. Ikeda (Graduate Student)

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  1. Y. Umakoshi
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  2. H. Y. Yasuda
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  3. T. Nakano
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  4. K. Ikeda
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Additional information

This article is based on a presentation made in the symposium “Fundamentals of Gamma Titanium Aluminides,” presented at the TMS Annual Meeting, February 10–12, 1997, Orlando, Florida, under the auspices of the ASM/MSD Flow & Fracture and Phase Transformations Committees.

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Umakoshi, Y., Yasuda, H.Y., Nakano, T. et al. Effect of deformation temperature on fatigue and fracture behavior in TiAl polysynthetically twinned crystals. Metall Mater Trans A 29, 943–950 (1998). https://doi.org/10.1007/s11661-998-1003-3

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