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Effect of Boron on the Elevated-Temperature Tensile and Creep Behavior of Cast Ti-6Al-2Sn-4Zr-2Mo-0.1Si (Weight Percent)

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Abstract

This work investigated the effect of nominal boron additions of 0.1, 0.4, and 1 wt pct on the intermediate-temperature (455 °C to 565 °C) tensile and tensile-creep deformation behavior of as-cast Ti-6Al-2Sn-4Zr-2Mo-0.1Si (wt pct) for applied stresses between 138 and 600 MPa. A 0.1 wt pct boron addition resulted in a refinement of the as-cast grain size from 550 to 75 μm. Additional boron additions resulted in a less dramatic refinement of the as-cast grain size. Boron additions stabilized the orthorhombic TiB phase where the average TiB-phase volume percents were 0.7, 2.3, and 5.4 for the Ti-6Al-2Sn-4Zr-2Mo-0.1Si-0.1B (wt pct), Ti-6Al-2Sn-4Zr-2Mo-0.1Si-0.4B (wt pct), and Ti-6Al-2Sn-4Zr-2Mo-0.1Si-1B (wt pct) alloys, respectively. Overall, the boron additions did not have a dramatic effect on the creep behavior of Ti-6Al-2Sn-4Zr-2Mo-0.1Si, though the Ti-6Al-2Sn-4Zr-2Mo-0.1Si-1B (wt pct) alloy exhibited lower minimum creep rates than the baseline Ti-6Al-2Sn-4Zr-2Mo-0.1Si (wt pct) alloy. The sequence of surface deformation events during the elevated-temperature tensile deformation was characterized using in-situ experiments performed inside a scanning electron microscope. The TiB whisker microcracking occurred at stresses well below the global yield stress. Multiple and extensive TiB cracking occurred after global yielding. The α + β phase slip occurred after TiB whisker cracking.

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Notes

  1. Henceforth, all alloy compositions are given in weight percent.

  2. JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.

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Acknowledgments

The authors are grateful to Drs. S. Tamirisakandala (FMW Composites, Inc.) and D.B. Miracle (Air Force Research Laboratory) for donating the material used in this study as well as their helpful technical support and guidance. In addition, the authors are grateful to Mr. Larry Walker (Oak Ridge National Lab (ORNL)) for performing the microprobe work. The microprobe analysis and in-situ tensile creep experiments were performed at ORNL and were sponsored, in part, by the SHaRE User Facility, Scientific User Facilities Division, Office of Basic Energy Sciences, United States Department of Energy. The authors are grateful to Thomas Garcia (formerly of Michigan State University and now at Lockheed Martin) for his technical assistance.

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Authors and Affiliations

  1. Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI, 48824-1226, USA

    W. Chen (Graduate Student) & C.J. Boehlert (Associate Professor)

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  1. W. Chen
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  2. C.J. Boehlert
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Correspondence to W. Chen.

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Manuscript submitted August 27, 2008.

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Chen, W., Boehlert, C. Effect of Boron on the Elevated-Temperature Tensile and Creep Behavior of Cast Ti-6Al-2Sn-4Zr-2Mo-0.1Si (Weight Percent). Metall Mater Trans A 40, 1568–1578 (2009). https://doi.org/10.1007/s11661-009-9838-9

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