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Effects of Aging Treatments on the Mechanical Behavior of Ti-15V-3Cr-3Sn-3Al Alloy

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Abstract

The effect of aging treatments on the mechanical properties and microstructures of Ti-15V-3Cr-3Sn-3Al (Ti-15-3) alloy was evaluated using tensile, notched tensile, and J-integral tests. The properties for the one-step aged specimens (371 to 648 °C for 8 h) were compared with those for the two-step aged specimens (one-step aged + 426 °C/24 h). An increase in aging temperature of one-step aging resulted in increased notched tensile strength and fracture toughness of the Ti-15-3 alloy. The second-step aging at 426 °C for 24 h caused various degrees of hardening in the group of double aged specimens. Comparing to the one-step aged specimens, increased notch brittleness and decreased fracture toughness were observed in the two-step aged specimens. For the specimens subjected to aging at 648 °C, the formation of thick α layer at β grain boundaries resulted in lower tensile properties and fracture toughness. The fracture modes of the notch-brittle specimens were strongly affected by the distribution, size, and morphology of the α precipitates.

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Acknowledgment

The authors gratefully acknowledge the support of this study by the National Science Council, Republic of China (NSC100-2221-E-019-031).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, National Taiwan University, Taipei, 106, Taiwan, ROC

    Y.-K. Chou & C. Chen

  2. Institute of Materials Science and Engineering, National Taiwan Ocean University, Keelung, 202, Taiwan, ROC

    L. W. Tsay

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  1. Y.-K. Chou
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  2. L. W. Tsay
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  3. C. Chen
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Correspondence to L. W. Tsay.

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Chou, YK., Tsay, L.W. & Chen, C. Effects of Aging Treatments on the Mechanical Behavior of Ti-15V-3Cr-3Sn-3Al Alloy. J. of Materi Eng and Perform 24, 3365–3372 (2015). https://doi.org/10.1007/s11665-015-1622-y

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  • DOI: https://doi.org/10.1007/s11665-015-1622-y

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