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Influence of Strain Rate, Microstructure and Chemical and Phase Composition on Mechanical Behavior of Different Titanium Alloys

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Abstract

Taking three titanium commercial alloys: commercial purity titanium (c.p.Ti), Ti-6-4 (Ti-6(wt.%)Al-4V) and TIMETAL-LCB (Ti-1.5Al-4.5Fe-6.8Mo) as program materials, the influence of phase composition, microstructure and strain rate (varied from 8 × 10−4 to 1.81 × 10−1) on the mechanical behavior was studied. The size of the matrix phase (α- or β-grains) and size of α + β intragranular mixture were varied. Such parameter such as tensile toughness (TT) was used for analysis of the mechanical behavior of the materials on tension with different rates. It was found that the TT values monotonically decreased with strain rate, except Ti-6-4 alloy with a globular type of microstructure. In single-phase α-material (c.p.Ti), tensile deformation led to the formation of voids at the intragranular cell substructure, and merging of these voids caused the formation of main crack. In two-phase α + β materials, the deformation defects were localized upon tension predominantly near the α/β interphase boundaries, and subsequent fracture had different characters: In Ti-6-4 globular condition fracture started by formation of voids at the α/β interphase boundaries, whereas in all other conditions the voids nucleated at the tips of α-lamellae/needles.

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Acknowledgments

Parts of this work were done in frames of the Projects ## III-09-13 and 01-07-16 funded by National Academy of Sciences of Ukraine. Authors would like to thank Dr. O.I. Zaporogets for supersonic measurements and Mr. M.A. Skoryk (both from G.V. Kurdyumov Institute for Metal Physics, NAS of Ukraine) for help in SEM studies.

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The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. G.V. Kurdyumov Institute for Metal Physics, National Academy of Sciences of Ukraine, 36, Vernadsky Blvd., Kiev, 03142, Ukraine

    P. E. Markovsky & V. I. Bondarchuk

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  1. P. E. Markovsky
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  2. V. I. Bondarchuk
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Correspondence to P. E. Markovsky.

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Markovsky, P.E., Bondarchuk, V.I. Influence of Strain Rate, Microstructure and Chemical and Phase Composition on Mechanical Behavior of Different Titanium Alloys. J. of Materi Eng and Perform 26, 3431–3449 (2017). https://doi.org/10.1007/s11665-017-2781-9

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  • DOI: https://doi.org/10.1007/s11665-017-2781-9

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