Nanoindentation Measurement for a Tungsten(001)Single Crystal
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概要
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Nanoindentation measurement for tungsten(001)single crystal was conducted with an AFM ultra-micro hardness tester. For electrolytically polished tungsten(001)single crystal, sudden increase of penetration by around 50 nm occurred at 1.3 mN with a three-sided pyramidal indenter of an apical angle of 115°, and 0.24 mN with an indenter of 60°. Deformation was purely elastic under this critical force. However, these behaviors did not occur for mechanically polished surface, where a deformed layer of no more than 6 μm thickness exists. These facts lead an idea that such phenomena come from the same source of upper and lower yield points in tensile tests for B.C.C.crystals. Normalized shear stress τ_<max>/G at upper yield point was estimated as 0.22 and 0.24. Also, curvature radius of indenters, that is of great importance in nanoindentation, was estimated from both force-penetration depth curves and AFM topographic images.
- 一般社団法人日本機械学会の論文
- 1998-10-15
著者
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MIYAHARA Kensuke
Materials Information Technology Station, National Institute for Materials Science
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Miyahara K
National Institute For Materials Science Materials Information Technology Station Fatigue Group
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Miyahara Kensuke
Materials Information Technology Station National Institute For Materials Science
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NAGASHIMA Nobuo
National Institute for Materials Science, Materials Information Technology Station, Fatigue Group
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MIYAHARA Kensuke
Frontier Research Center for Structural Materials, National Research Institute for Metals
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MATSUOKA Saburo
Frontier Research Center for Structural Materials, National Research Institute for Metals
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NAGASHIMA Nobuo
Frontier Research Center for Structural Materials, National Research Institute for Metals
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Nagashima Nobuo
National Institute For Materials Science Materials Information Technology Station Fatigue Group
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