Nowadays, industrial products are downsized, and the structure of materials is controlled with the nanometer precision, and it becomes very important to measure the mechanical properties of local area of bulk material. Especially the hardness and the elastic modulus are important mechanical properties. The orientation dependence of hardness and reduced modulus of single crystal sapphire surface was investigated by nanoindentation. The conventional technique to measure the hardness of materials using an optical micrometer cannot evaluate mechanical properties of a local region of several µm or less. However, nanoindentation can measure mechanical properties of very small surface area of materials, and is expected to detect the micro structure dependence of mechanical properties. Nanoindentation uses very small indenter made of diamond, and measures the indentation depth. The measured depth is converted to the indented area size using the area function. The area function of the indenter can be obtained using a standard material (fused quartz) in advance. Therefore nanoindentation can measure the indented area size without using an optical micrometer. In this report, it was shown that the nanoindentation could detect the structure dependence of mechanical properties of materials. The specimen was a single crystal sapphire with c - axis surface, and the indenter was Berkovich type diamond tip. It was confirmed that the nanoindentation hardness was the lowest, and the reduced modulus was the largest, when the ridge line of indenter was oriented to the m - axis of single crystal. The nanoindentation could detect the structure dependence of a local area of mechanical properties materials.
| Published in | International Journal of Materials Science and Applications (Volume 8, Issue 5) |
| DOI | 10.11648/j.ijmsa.20190805.11 |
| Page(s) | 76-80 |
| Creative Commons |
This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited. |
| Copyright |
Copyright © The Author(s), 2019. Published by Science Publishing Group |
Nanoindentation, Hardness, Elastic Modulus, Single Crystal, Sapphire
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APA Style
Toshiro Okawa, Ian Thomas Clark, Katsuhiko Tashiro, Hideo Honma, Kazuhiro Yoshihara, et al. (2019). Orientation Dependence of Hardness and Reduced Modulus of Single Crystal Sapphire Surface Measured by Nanoindentation. International Journal of Materials Science and Applications, 8(5), 76-80. https://doi.org/10.11648/j.ijmsa.20190805.11
ACS Style
Toshiro Okawa; Ian Thomas Clark; Katsuhiko Tashiro; Hideo Honma; Kazuhiro Yoshihara, et al. Orientation Dependence of Hardness and Reduced Modulus of Single Crystal Sapphire Surface Measured by Nanoindentation. Int. J. Mater. Sci. Appl. 2019, 8(5), 76-80. doi: 10.11648/j.ijmsa.20190805.11
AMA Style
Toshiro Okawa, Ian Thomas Clark, Katsuhiko Tashiro, Hideo Honma, Kazuhiro Yoshihara, et al. Orientation Dependence of Hardness and Reduced Modulus of Single Crystal Sapphire Surface Measured by Nanoindentation. Int J Mater Sci Appl. 2019;8(5):76-80. doi: 10.11648/j.ijmsa.20190805.11
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Download@article{10.11648/j.ijmsa.20190805.11,
author = {Toshiro Okawa and Ian Thomas Clark and Katsuhiko Tashiro and Hideo Honma and Kazuhiro Yoshihara and Osamu Takai},
title = {Orientation Dependence of Hardness and Reduced Modulus of Single Crystal Sapphire Surface Measured by Nanoindentation},
journal = {International Journal of Materials Science and Applications},
volume = {8},
number = {5},
pages = {76-80},
doi = {10.11648/j.ijmsa.20190805.11},
url = {https://doi.org/10.11648/j.ijmsa.20190805.11},
eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijmsa.20190805.11},
abstract = {Nowadays, industrial products are downsized, and the structure of materials is controlled with the nanometer precision, and it becomes very important to measure the mechanical properties of local area of bulk material. Especially the hardness and the elastic modulus are important mechanical properties. The orientation dependence of hardness and reduced modulus of single crystal sapphire surface was investigated by nanoindentation. The conventional technique to measure the hardness of materials using an optical micrometer cannot evaluate mechanical properties of a local region of several µm or less. However, nanoindentation can measure mechanical properties of very small surface area of materials, and is expected to detect the micro structure dependence of mechanical properties. Nanoindentation uses very small indenter made of diamond, and measures the indentation depth. The measured depth is converted to the indented area size using the area function. The area function of the indenter can be obtained using a standard material (fused quartz) in advance. Therefore nanoindentation can measure the indented area size without using an optical micrometer. In this report, it was shown that the nanoindentation could detect the structure dependence of mechanical properties of materials. The specimen was a single crystal sapphire with c - axis surface, and the indenter was Berkovich type diamond tip. It was confirmed that the nanoindentation hardness was the lowest, and the reduced modulus was the largest, when the ridge line of indenter was oriented to the m - axis of single crystal. The nanoindentation could detect the structure dependence of a local area of mechanical properties materials.},
year = {2019}
}
TY - JOUR T1 - Orientation Dependence of Hardness and Reduced Modulus of Single Crystal Sapphire Surface Measured by Nanoindentation AU - Toshiro Okawa AU - Ian Thomas Clark AU - Katsuhiko Tashiro AU - Hideo Honma AU - Kazuhiro Yoshihara AU - Osamu Takai Y1 - 2019/10/10 PY - 2019 N1 - https://doi.org/10.11648/j.ijmsa.20190805.11 DO - 10.11648/j.ijmsa.20190805.11 T2 - International Journal of Materials Science and Applications JF - International Journal of Materials Science and Applications JO - International Journal of Materials Science and Applications SP - 76 EP - 80 PB - Science Publishing Group SN - 2327-2643 UR - https://doi.org/10.11648/j.ijmsa.20190805.11 AB - Nowadays, industrial products are downsized, and the structure of materials is controlled with the nanometer precision, and it becomes very important to measure the mechanical properties of local area of bulk material. Especially the hardness and the elastic modulus are important mechanical properties. The orientation dependence of hardness and reduced modulus of single crystal sapphire surface was investigated by nanoindentation. The conventional technique to measure the hardness of materials using an optical micrometer cannot evaluate mechanical properties of a local region of several µm or less. However, nanoindentation can measure mechanical properties of very small surface area of materials, and is expected to detect the micro structure dependence of mechanical properties. Nanoindentation uses very small indenter made of diamond, and measures the indentation depth. The measured depth is converted to the indented area size using the area function. The area function of the indenter can be obtained using a standard material (fused quartz) in advance. Therefore nanoindentation can measure the indented area size without using an optical micrometer. In this report, it was shown that the nanoindentation could detect the structure dependence of mechanical properties of materials. The specimen was a single crystal sapphire with c - axis surface, and the indenter was Berkovich type diamond tip. It was confirmed that the nanoindentation hardness was the lowest, and the reduced modulus was the largest, when the ridge line of indenter was oriented to the m - axis of single crystal. The nanoindentation could detect the structure dependence of a local area of mechanical properties materials. VL - 8 IS - 5 ER -
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