Takahiro Shikagawa
Ibaraki University
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Featured researches published by Takahiro Shikagawa.
Materials Science Forum | 2010
Iya I. Tashlykova-Bushkevich; Takahiro Shikagawa; Takayoshi Suzuki; Vg Shepelevich; Goroh Itoh
Hydrogen (H) behaviour in materials was investigated in rapidly solidified (RS) foils of pure aluminium (Al), Al-0.4 Cr and Al-0.25 Zr alloys (at %) by means of thermal desorption spectroscopy (TDS). In addition, Al-0.25; 0.3 Zr alloys were examined with respect to microstructure and its instability during the thermal process using SEM and microhardness measurements. The effect of dopes and heating rate on H desorption was summarized. The lowest energy desorption is attributed with significant thermal desorption peak which temperature was found is correlated with sample composition.
Materials Science Forum | 2010
Iya I. Tashlykova-Bushkevich; Takahiro Shikagawa; Vg Shepelevich; Goroh Itoh
Thermal desorption spectroscopy (TDS) technique has been used to study hydrogen behaviour in rapidly solidified (RS) aluminium (Al) both as-cast and exposed to humid air (HA). The surface morphology of the foils was studied through atomic force microscopy (AFM). Analysis was made of the effect of rapid solidification processing (RSP) on H/microstructure interactions, including investigation of alloying element (0.05 at % Ti) influence on H trapping in Al.
Materials Science Forum | 2006
Takahiro Shikagawa; Goroh Itoh; Shunsuke Suzuki; Hiromitsu Kuroda; Toshiyuki Horikoshi
Although low-alloyed aluminum has been used as electric line and cable materials to date, there still is a great demand for higher strength with retaining the good electrical conductivity and ductility. In the study, iron has been chosen as an additive element and the addition effect on the strength and electrical has been investigated since iron is reported to have a marked solution-strengthening effect at a given addition amount. Aluminum with 99.99mass% purity and Al-Fe alloys with iron up to 0.9mass% were induction-melted, continuously cast into a rod with 8mm diameter, and cold-drawn into a wire with 0.3mm diameter. Tensile test and electrical resistivity measurement were carried out on the rod and wire after each pass. It was found that, in the rod, the strength increased while the ductility and electrical conductivity decreased as the addition iron amount was increased. Work hardening occurred clearly at an early stage of cold drawing, while it became sluggish as the cold reduction increased in each material. At the early stage, the strengths increased as the iron amount was increased, and at the later stage, the alloy with iron addition of 0.9mass% had higher strengths and larger elongation to failure.
Advanced Materials Research | 2011
Hideki Iwahashi; Goroh Itoh; Katsuhiro Saitoh; Takahiro Shikagawa
An increasing interest has been being taken in hydrogen as a clean energy for solving the global environmental problems. In order to use the hydrogen in safety, investigation on the hydrogen behavior is required. Although hydrogen microprint technique (HMPT) has been known to be effective to investigate the hydrogen behavior, the low detection efficiency for hydrogen was reported. Ion-plating (IP) was reported to increase the detection efficiency in HMPT emitted from the specimen by plastic deformation. On the other hand, no such increase was found for hydrogen permeating through the specimen ion-plated with substrate heating in the previous study by the authors. In the present study, the sheet samples of pure aluminum with 99.99% purity were dehydrogenated and subjected to (a) holding in the IP chamber, (b) bombardment with Ar ions, (c) substrate heating after the bombardment and (d) holding in air. Hydrogen behavior in these samples has been investigated by means of thermal desorption spectroscopy (TDS). The amount of desorbed hydrogen was evidently larger in the conditions of (a) and (b) than in (d). However, the amount of desorbed hydrogen was decreased by the substrate heating (c) to the same level as in (d).
Materials Transactions | 2011
Iya I. Tashlykova-Bushkevich; Goroh Itoh; Vg Shepelevich; Takahiro Shikagawa
Journal of Japan Institute of Light Metals | 2010
Takahiro Shikagawa; Goroh Itoh
The Proceedings of Conference of Kanto Branch | 2009
Goroh Itoh; Takahiro Shikagawa
The Proceedings of Ibaraki District Conference | 2008
Yu Ohta; Takahiro Shikagawa; Goroh Itoh; Yoshinobu Motohashi
The Proceedings of Ibaraki District Conference | 2008
Yu Suzuki; Takahiro Shikagawa; Iwao Nakatsu; Goroh Itoh; Nobuhide Itoh
The Proceedings of Ibaraki District Conference | 2007
Yuichi Furuya; Takahiro Shikagawa; Goroh Itoh; Toshiyuki Horikoshi; Hiromitsu Kuroda
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Belarusian State University of Informatics and Radioelectronics
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