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Effect of Grain Size on the Tensile Deformation Mechanisms of Commercial Pure Titanium as Revealed by Acoustic Emission

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Abstract

The effect of grain size on the deformation mechanisms during different tensile stages in commercial pure titanium was investigated by acoustic emission (AE) at room temperature. The deformation mechanisms, dislocation slip, and mechanical twinning were found to be the two AE sources for all grain sizes throughout the experiments. Based on the AE features of frequency and energy, the AE signals stemming from the two deformation mechanisms were classified. As grain size increased, the AE activity and intensity attributed to twinning increased. The twinning activity was confirmed by optical microscope and scanning electron microscopy. The results showed that for the specimen with small-sized grains, the entire tensile deformation was mainly achieved by slip, and only slightly assisted by twinning. Deformation of the specimen with medium-sized grains was accomplished by combined slip and twinning. For the specimen with large grains, twinning was the more active mechanism during the early stages of the tensile tests, while slip played a larger role in the later stages of the tensile tests. This larger role of slip in the later stages occurred despite the notable increase in the amount of twinning.

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Acknowledgment

This study was financially supported by the Chinese 12th five-year project 2011BAK06B03.

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Authors and Affiliations

  1. 8th Lab of the School of Material Science and Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing, 100191, China

    Lifei Li & Zheng Zhang

  2. China Special Equipment Inspection and Research Institute, Beijing, 100013, China

    Gongtian Shen

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  1. Lifei Li
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Correspondence to Zheng Zhang.

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Li, L., Zhang, Z. & Shen, G. Effect of Grain Size on the Tensile Deformation Mechanisms of Commercial Pure Titanium as Revealed by Acoustic Emission. J. of Materi Eng and Perform 24, 1975–1986 (2015). https://doi.org/10.1007/s11665-015-1447-8

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  • DOI: https://doi.org/10.1007/s11665-015-1447-8

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