Nanoindentation and Raman spectroscopy studies of boron carbide single crystals

Applied Physics Letters - Tập 81 Số 20 - Trang 3783-3785 - 2002
Vladislav Domnich1, Yury Gogotsi1, Michael Trenary2, Takaho Tanaka3
1Department of Materials Engineering, Drexel University, Philadelphia, Pennsylvania, 19104
2Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607
3National Institute for Materials Science, Ibaraki 305-0044, Japan

Tóm tắt

The measurements of hardness and elastic modulus have been conducted on the (0001) and (101̄1) faces of B4.3C single crystals using nanoindentation. The results are in good agreement with the corresponding values obtained using a conventional microhardness technique on polycrystalline ceramics. Raman microspectroscopy analysis of the nanoindentations shows the appearance of several bands which suggest dramatic structural changes in the indented material. Localized contact loading may lead to damage in boron carbide resulting in disorder or a pressure-induced solid state phase transformation in the region under the indenter, although the exact mechanism responsible for the observed Raman spectra could not be identified at this time. This may explain why little variation in mechanical properties was observed with respect to the crystallographic orientation.

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Thông tin
Thông tin xuất bản

Applied Physics Letters

Tập 81 Số 20

3783-3785

Thông tin tác giả