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High-Temperature Deformation Behavior of a Ti-6Al-7Nb Alloy in Dual-Phase (α + β) and Single-Phase (β) Regions

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Abstract

The present study aimed to characterizing the microstructure evolution of a Ti-6Al-7Nb biomedical type titanium alloy during hot working through hot compression tests. The hot deformation cycles were conducted under the strain rate of 0.0025, 0.025, and 0.25 s−1 in the temperature range of 850-1150 °C where both dual-phase (α + β) and single-phase (β) regions could be accessible. The flow stress behavior of the material for the entire deformation regime was interpreted via microstructural observations. The results indicated that in the single-phase β region (1050-1150 °C), the dynamically recrystallized (DRX) grains were formed at the deformed and elongated beta grain boundaries as a necklace-like structure. The variations in the dynamically recrystallized grain size were determined to follow the Zener-Hollomon relationship where DRX grain size was decreased by reducing the temperature and increasing the strain rate. The alloy deformation characteristics in α + β region were somewhat different. During deformation in the upper α + β temperature range (e.g., 1000 °C), the β phase would accommodate most of the deformation, while α regions remained undeformed. In the lower α + β temperature range (e.g., 850-950 °C), the kinking/bending of α lamellae as well as the subsequent globularization of α layers were postulated to be responsible for the observed flow softening behavior.

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Authors and Affiliations

  1. Hot Deformation and Thermomechanical Processing of High Performance Engineering Materials Lab, School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran

    F. Pilehva, A. Zarei-Hanzaki, S. Moemeni & A. R. Khalesian

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  1. F. Pilehva
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Correspondence to A. Zarei-Hanzaki.

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Pilehva, F., Zarei-Hanzaki, A., Moemeni, S. et al. High-Temperature Deformation Behavior of a Ti-6Al-7Nb Alloy in Dual-Phase (α + β) and Single-Phase (β) Regions. J. of Materi Eng and Perform 25, 46–58 (2016). https://doi.org/10.1007/s11665-015-1813-6

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  • DOI: https://doi.org/10.1007/s11665-015-1813-6

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