Multipoint indentation for material identification in three-dimensional observation based on serial sectioning |
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| Affiliation: | 1. Department of Materials Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan;2. Institute for Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-0041, Japan;3. National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan;4. Graduate School of Frontier Science, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8651, Japan;1. Mathematical Science Group, WPI-Advanced Institute for Materials Research (AIMR), Tohoku University, Japan;2. Research Institute for Electronic Science, Hokkaido University, Japan;3. MathAM-OIL, Tohoku University and AIST, Japan;1. Department of Aerospace Engineering, Tohoku University, 6-6-01 Aramaki-Aza-Aoba, Aoba-ku, Sendai 980-8579, Japan;2. Department of Materials Science and Engineering, University of Washington, Seattle, WA 98195, USA;1. Department of Aerospace Engineering, Tohuku University, 6-6-01 Aramaki-Aza-Aoba, Aoba-ku Sendai, Miyagi 980-8579, Japan;2. Institute of Fluid Science, Tohuku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan;3. Dassault Systèmes K.K., ThinkPark Tower, 2-1-1 Osaki, Shinagawa-ku, Tokyo 141-6020, Japan;4. Department of Chemistry, Tohoku University, 6-3 Aramaki Aza-Aoba, Aoba-ku, Sendai 980-8578, Japan;5. Department of Mechanical Engineering and Science, Kyoto University, Nishikyo-ku, Kyoto 615-8540, Japan;6. Composite Structures Laboratory, Aerospace Engineering, University of Michigan, Ann Arbor, MI 48109-2140, USA;7. Toray Composite Materials America, Inc Tacoma, WA 98446, USA;8. William E. Boeing Department of Aeronautics and Astronomics, University of Washington, Seattle, 98195-2400, WA, USA;9. Department of Material Science and Engineering, University of Washington, BOX 352120, Seattle, WA 98195, USA |
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| Abstract: | Three-dimensional (3D) observations of internal structures are important for evaluating material properties. Serial sectioning with destructive processes is traditionally employed as a 3D observation method. Identifying the boundaries of elements in microscope images and measuring the mechanical properties of each element are required for the evaluation of the mechanical properties of composite materials. This study provides a system for measuring the local hardness and elastic modulus by conducting indentation tests during serial sectioning processes. An automatic serial sectioning observation was performed during a combination process of precision cutting in high-speed milling with a single-crystal diamond tool and microscopic observation. A Vickers indenter was attached to a tool spindle table, and indentation tests were conducted under a displacement control process at submicron spatial resolution. The indentation modulus was obtained by analyzing the force–displacement profile measured during the unload process. The scale effects relating to the indentation depth in the measurements of the indentation modulus were confirmed for an Al alloy sample measured in this system. This study focused on the identification of components by using hardness information measured under the same indentation depth on a two-dimensional flat surface after precision cutting of the material. Three types of metal wires (1 mm diameter) embedded in plastic resin were used in the experiment. The hardness distributions on the serial sectioning surfaces were measured, and the values measured at each wire area on 3D positions were used for the identification of their material properties. This serial sectioning observation creates a 3D microstructural model including not only microscopic images, but also hardness and elastic modulus information for the identification of components in the microscopic area. |
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| Keywords: | Serial sectioning Precision cutting Indentation tests Optical microscope Elastic modulus |
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