Commercial pure titanium has been widely used in the aerospace, chemical, and biomedical industries because of its light weight, high corrosion resistance, high strength, high heat resistance, and good biocompatibility. Pure titanium takes the form of a hexagonal closed-pack structure with anisotropic elasticity and plasticity, with most of its components being polycrystalline aggregates having different crystal orientations. Small mechanical loading under elastic conditions therefore always induces inhomogeneous microscopic deformation, and the resulting inhomogeneity brings about various defects such as inhomogeneous plastic deformation, microcracking, and necking. It is therefore important to investigate the microscopic inhomogeneous deformation under elastic and plastic conditions. In this study, a plate specimen of commercial pure titanium was subjected to a tensile test on the stage of a digital holographic microscope (DHM), and the microscopic deformation of grains in the specimen under elastic and plastic conditions were observed and measured. During the test, the grains’ height distribution was measured in a fixed area on the specimen’s surface at each tensile loading step, and the correlation between height distributions at different loads was examined. We found from the measurements that each grain shows a different height change even under elastic conditions with a small load. This inhomogeneous height change was enhanced as the load was increased to plastic conditions. A strong correlation between the height changes under elastic and plastic conditions was also found. This result suggests that the microscopic deformation experienced under plastic conditions is predictable from that observed under elastic conditions.
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December 2017
Research-Article
Elastic and Plastic Microscopic Undulation on the Surface of Polycrystalline Pure Titanium Under Tension
Naoya Tada,
Naoya Tada
Professor
Mem. ASME
Graduate School of Natural Science
and Technology,
Okayama University,
3-1-1 Tsushimanaka, Kita-ku,
Okayama 700-8530, Japan
e-mail: tada@okayama-u.ac.jp
Mem. ASME
Graduate School of Natural Science
and Technology,
Okayama University,
3-1-1 Tsushimanaka, Kita-ku,
Okayama 700-8530, Japan
e-mail: tada@okayama-u.ac.jp
Search for other works by this author on:
Takeshi Uemori,
Takeshi Uemori
Graduate School of Natural Science and
Technology,
Okayama University,
3-1-1 Tsushimanaka,
Kita-ku, Okayama 700-8530, Japan
e-mail: uemori@okayama-u.ac.jp
Technology,
Okayama University,
3-1-1 Tsushimanaka,
Kita-ku, Okayama 700-8530, Japan
e-mail: uemori@okayama-u.ac.jp
Search for other works by this author on:
Toshiya Nakata
Toshiya Nakata
Graduate School of Natural Science and
Technology,
Okayama University,
3-1-1 Tsushimanaka, Kita-ku,
Okayama 700-8530, Japan
e-mail: tnakata@okayama-u.ac.jp
Technology,
Okayama University,
3-1-1 Tsushimanaka, Kita-ku,
Okayama 700-8530, Japan
e-mail: tnakata@okayama-u.ac.jp
Search for other works by this author on:
Naoya Tada
Professor
Mem. ASME
Graduate School of Natural Science
and Technology,
Okayama University,
3-1-1 Tsushimanaka, Kita-ku,
Okayama 700-8530, Japan
e-mail: tada@okayama-u.ac.jp
Mem. ASME
Graduate School of Natural Science
and Technology,
Okayama University,
3-1-1 Tsushimanaka, Kita-ku,
Okayama 700-8530, Japan
e-mail: tada@okayama-u.ac.jp
Takeshi Uemori
Graduate School of Natural Science and
Technology,
Okayama University,
3-1-1 Tsushimanaka,
Kita-ku, Okayama 700-8530, Japan
e-mail: uemori@okayama-u.ac.jp
Technology,
Okayama University,
3-1-1 Tsushimanaka,
Kita-ku, Okayama 700-8530, Japan
e-mail: uemori@okayama-u.ac.jp
Toshiya Nakata
Graduate School of Natural Science and
Technology,
Okayama University,
3-1-1 Tsushimanaka, Kita-ku,
Okayama 700-8530, Japan
e-mail: tnakata@okayama-u.ac.jp
Technology,
Okayama University,
3-1-1 Tsushimanaka, Kita-ku,
Okayama 700-8530, Japan
e-mail: tnakata@okayama-u.ac.jp
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received October 4, 2016; final manuscript received July 31, 2017; published online October 19, 2017. Editor: Young W. Kwon.
J. Pressure Vessel Technol. Dec 2017, 139(6): 061403 (8 pages)
Published Online: October 19, 2017
Article history
Received:
October 4, 2016
Revised:
July 31, 2017
Citation
Tada, N., Uemori, T., and Nakata, T. (October 19, 2017). "Elastic and Plastic Microscopic Undulation on the Surface of Polycrystalline Pure Titanium Under Tension." ASME. J. Pressure Vessel Technol. December 2017; 139(6): 061403. https://doi.org/10.1115/1.4038012
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