| Project/Area Number |
16340152
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geology
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| Research Institution | Shizuoka University |
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Principal Investigator |
MASUDA Toshiaki Shizuoka University, Faculty of Science, Institute of Geosciences, Professor, 理学部, 教授 (30126164)
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| Co-Investigator(Kenkyū-buntansha) |
MICHIBAYASHI Katsuyoshi Shizuoka University, Faculty of Science, Institute of Geosciences, Associate Professor, 理学部, 助教授 (20270978)
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| Project Period (FY) |
2004 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥14,600,000 (Direct Cost: ¥14,600,000)
Fiscal Year 2006: ¥4,300,000 (Direct Cost: ¥4,300,000)
Fiscal Year 2005: ¥6,000,000 (Direct Cost: ¥6,000,000)
Fiscal Year 2004: ¥4,300,000 (Direct Cost: ¥4,300,000)
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| Keywords | quartz / grain boundary / nanoindentation tester / indentation impression / residual stress / Meyer hardness / Berkovich indenter / Raman spectroscopy / 高温硬度 / 定荷重変位 / ループエネルギー / トパーズ / 方解石 / 塑性変形 / イスアれき岩 / ビグディンれき岩 / 点接触変形 / ナノメートル |
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| Research Abstract |
We investigated how quartz single crystal deformes around the indentation impression by using the Raman microspectroscopy and the EBSD-SEM.
The laser Raman microspectroscopy revealed that quartz far from the indentation impression exhibit clear Raman spectra with strong bands at wavenumbers of 728. 206 and 464 cm-7 which are typical for intact a-quartz. The clear bands gradually shift and broaden with approaching to the indentation impression. They have shoulders at the edge of the impression, and finally split into two subbands at the central part of the impression. Such shape change of the Raman bands is considered to be related to the generated residual stress field within the quartz crystal by the indentation test. The magnitude of the residual stress can be estimated from the shifted wavenumbers of the Raman bands, and the maximum compressive and tensile stresses are revealed to exceed 2 and 0.1 GPa, respectively, at the center of the indentation impression.
The SEM-EBSD study revealed that Dauphine twins can be perceived with the characteristic Kikuchi bands and contrasts in the back scattered images in hexagonal areas close to the indentation impression. As Dauphine twins occur systematically with respect to the indented impression, we concluded that Dauphine twins have developed during the indentation test.
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