ORCID Profile
0000-0003-1984-3270
Current Organisation
Nagaoka University of Technology
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: IOP Publishing
Date: 03-2011
Publisher: Elsevier BV
Date: 04-2012
Publisher: IOP Publishing
Date: 03-2011
Publisher: Elsevier BV
Date: 03-2021
Publisher: AIP Publishing
Date: 16-07-2007
DOI: 10.1063/1.2755923
Abstract: High strength ultrafine/nanograined aluminum materials with ultimate strength up to 740MPa and Vickers microhardness up to 2285MPa were produced using back pressure equal channel angular processing of ultrafine-sized aluminum powder at 400°C. Microstructure analyses revealed that the attained high strength and microhardness were derived from the presence of nanosized aluminum and γ-alumina grains (5–10nm) as well as residual amorphous alumina. The interaction between the severe shear deformation and the preexisting amorphous alumina, concurrent oxidation, and amorphous to γ-alumina transition was considered to be responsible for the formation of such a refined and complex nanostructure.
Publisher: Elsevier BV
Date: 10-2017
Publisher: Elsevier BV
Date: 07-2007
Publisher: Elsevier BV
Date: 08-2009
Publisher: Elsevier BV
Date: 2018
Publisher: Elsevier BV
Date: 12-2009
Publisher: Elsevier BV
Date: 11-2011
Publisher: Elsevier BV
Date: 2011
Publisher: Elsevier BV
Date: 10-2009
Publisher: Japanese Society of Snow and Ice
Date: 2019
DOI: 10.5331/BGR.19R01
Publisher: Elsevier BV
Date: 03-2019
Publisher: Elsevier BV
Date: 11-2008
Publisher: Elsevier BV
Date: 08-2009
Publisher: Elsevier BV
Date: 04-2012
Publisher: Elsevier BV
Date: 08-2011
Publisher: IOP Publishing
Date: 03-2011
Publisher: Informa UK Limited
Date: 04-12-2019
Publisher: Informa UK Limited
Date: 02-12-2015
Publisher: Elsevier BV
Date: 03-2005
Publisher: Elsevier BV
Date: 09-2007
DOI: 10.1016/J.ULTRAMIC.2007.02.024
Abstract: A dual FIB/SEM provides solutions to many challenges in atom probe specimen preparation. When combined with an in situ lift-out capability, the versatility of this tool allows almost any region of interest, in almost any geometry, to be placed at the apex of a specimen tip. Several preparation techniques have been developed in response to specific application requirements for ex le, in cases where materials are not suitable for electropolishing, or where site-specific analysis is required. Two general techniques, with wide-ranging potential applications, are described in detail here. The first is a 'cut-out' technique that provides a relatively quick means of micro-tip specimen preparation from bulk material s les. The second method is a 'lift-out' technique that can be used in an in situ or ex situ mode and does not require the preparation of pre-sharpened mounting points.
Publisher: Elsevier BV
Date: 12-2010
Publisher: Elsevier BV
Date: 05-2009
Publisher: Elsevier BV
Date: 08-2010
Publisher: Elsevier BV
Date: 03-2011
Publisher: Elsevier BV
Date: 12-2008
Publisher: Elsevier BV
Date: 10-2009
Publisher: Cambridge University Press (CUP)
Date: 30-05-2019
DOI: 10.1017/JOG.2019.29
Abstract: We investigated the effects of microparticles and grain size on the microstructural evolutions and mechanical properties of polycrystalline ice. Uniaxial compression tests were conducted using fine-grained pure ice and silica-dispersed ice under various conditions. Deformation behavior of fine-grained ice was found to be characterized by stress exponent n ≈ 2 and activation energy Q ≈ 60 kJ mol −1 . The derived strain rates of fine-grained ice were ≈ 1 order of magnitude larger than those of coarse-grained ice obtained in previous studies, and they were found to be independent of particle dispersion and dependent on the mean grain size of ice, with grain size exponent p ≈ 1.4. Work hardening was observed in dislocation creep, while the strain rate continued to decrease. These results indicate that the deformation mechanism of fine-grained ice is different from typical dislocation creep, often associated with n = 3. Although microparticles restricted grain growth, there was little direct effect on the deformation of fine-grained ice. Microstructural observations of the ice s les indicated that the grain boundaries were straight and that the subgrain boundary densities increased after deformation. Our experiments suggest that grain size and boundaries play important roles in the deformation processes of polycrystalline ice.
Publisher: Informa UK Limited
Date: 05-2002
Publisher: Elsevier BV
Date: 03-2012
Publisher: Elsevier BV
Date: 09-2009
Publisher: Informa UK Limited
Date: 21-04-2012
Publisher: Springer Science and Business Media LLC
Date: 21-03-2012
Publisher: AIP Publishing
Date: 07-03-2016
DOI: 10.1063/1.4943075
Abstract: We have investigated a relationship between the fabrication process and the resultant crystal structure of a MnSi1.73 thermoelectric material in order to understand the effect of microstructures on the thermoelectric properties. Local crystal structure of the matrix phase is identified as a modulated Mn15Si26 phase based on the Ye and Amelinckx method [J. Solid State Chem. 61, 8 (1986)]. The Mn15Si26 phase is a degenerate semiconductor showing metal like behavior. In addition, nanoscale SiO2 particles are dispersed. The crystal structure of SiO2 is amorphous, and the SiO2 particles reduce thermal conductivity because of its inherent characteristic. A relatively high figure of merit of 0.38 is obtained, resulting from the multiple microstructures of Mn15Si26 and SiO2.
Publisher: Elsevier BV
Date: 12-2011
Publisher: Elsevier BV
Date: 04-2010
Publisher: Springer Science and Business Media LLC
Date: 04-01-2007
Publisher: Informa UK Limited
Date: 24-05-2021
Publisher: Elsevier BV
Date: 04-2004
Publisher: Elsevier BV
Date: 09-2005
Publisher: Elsevier BV
Date: 03-2009
Publisher: Elsevier BV
Date: 03-2021
Publisher: Japan Institute of Light Metals
Date: 2012
DOI: 10.2464/JILM.62.272
Publisher: Elsevier BV
Date: 08-2009
Publisher: Elsevier BV
Date: 07-2013
Publisher: Springer Science and Business Media LLC
Date: 26-09-2012
Publisher: Japan Institute of Metals
Date: 08-2019
Publisher: Elsevier BV
Date: 02-2009
Publisher: Informa UK Limited
Date: 21-06-2018
Publisher: Springer Science and Business Media LLC
Date: 10-2011
Publisher: MDPI AG
Date: 29-07-2023
Abstract: The β-type and sintered Ti-3.6Fe-5Zr-0.2B (mass%) alloy has been consolidated by spark plasma sintering, followed by a β solution treatment (ST). In order to obtain a high-strength ductile balance, water quenching or air cooling is used after ST. Modification of sintering conditions, which leads to 100% of the relative density, improves the tensile ductility. The Fe addition causes a large local lattice and compressive strain to the bcc Ti lattice in the water-quenched s le, α” martensite phases appear in the β matrix. When air cooling is applied after the ST, bimodal α lath phases are instead precipitated during the cooling in nanoscale, and the formation of α” martensite phases is suppressed. This results in high strength and better ductility when compared with those in the water-quenched s le, particularly in tensile properties. The air-cooled s le reveals attractive mechanical properties in both tension and compression modes.
Publisher: Informa UK Limited
Date: 04-07-2019
Publisher: Elsevier BV
Date: 03-2019
Publisher: Elsevier BV
Date: 02-2010
No related grants have been discovered for Tomoyuki Homma.