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High strength and formable Mg-6.2Zn-0.5Zr-0.2Ca alloy sheet processed by twin roll casting
Bhattacharjee, T.,Suh, B.C.,Sasaki, T.T.,Ohkubo, T.,Kim, N.J.,Hono, K. Elsevier Sequoia 2014 Materials science & engineering. properties, micro Vol.609 No.-
Twin roll cast and hot rolled Mg-6.2wt%Zn alloys microalloyed with Zr, Ca, and Ag show tensile yield strength exceeding 300MPa in the T6 (peak-aged) condition with reasonable formability in the T4 condition. The addition of Zr and Ca plays a critical role in the development of weak textured recrystallized microstructure in Mg-6.2wt%Zn alloys so Mg-6.2Zn-0.5Zr-0.2Ca (wt%) alloy shows equivalent mechanical properties with Mg-6.2Zn-0.5Zr-0.2Ca-0.4Ag (wt%) alloy even without expensive Ag.
Sasaki, T.T.,Ohkubo, T.,Hono, K. Elsevier 2009 Acta materialia Vol.57 No.12
<P><B>Abstract</B></P><P>Nanocrystalline Al–5at.% Fe alloy powders produced by mechanical alloying were consolidated by spark plasma sintering. The sintered sample showed high strength >1000MPa with a large plastic strain of 15% at room temperature and 500MPa at 350°C. Microstructure characterizations by transmission electron microscopy and atom probe tomography revealed that the sintered samples are composed of α-Al and Al<SUB>6</SUB>Fe nanocrystalline regions with 90nm in diameter and a minor fraction of Al<SUB>13</SUB>Fe<SUB>4</SUB> phase and coarsened 0.5–1μm α-Al grains. This bimodally grained feature is attributed to the relatively large plastic strain for the strength level of 1000MPa at room temperature.</P>
Characteristics of second harmonic ECCD on CHS
yasuo Yoshimura,H. Matsushita,H. Igami,K. Nagasaki,K. Matsuoka,K. Ohkubo,K. Nagaoka,M. Isobe,S. Kobayashi,S. Okamura,S. Kubo,S. Nishimura,T. Minami,T. Akiyama,T. Notake,T. Shimozuma,A. Shimizu,C. Suzu 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Second harmonic electron cyclotron current drive (ECCD) has been investigated on CHS (Compact Helical System) by using a 2-D steerable EC-beam injection system. The direction of the plasma current, which is the sum of bootstrap current and EC-driven current, is clearly reversed by a reversal of the EC-beam injection direction. The direction of driven current is consistent with expectation in the case of low-field side injection of EC wave. So far, a driven current up to 6 kA has been obtained when bootstrap current is less than 2 kA. It is confirmed that right-hand polarization and low density are effective for ECCD.
Superconducting Tunnel Junction Detectors for Mass Spectrometry
Ohkubo, M.,Zen, N.,Kitazume, T.,Ukibe, M.,Shiki, S.,Koike, M. The Korean Superconductivity Society 2012 Progress in superconductivity Vol.14 No.2
With conventional mass spectrometry (MS), ions are separated according to mass/charge (m/z) ratios. We must speculate the z values to obtain the m values. Superconducting tunnel junction (STJ) detectors can solve this problem, and true mass spectrometry becomes possible instead of m/z spectrometry. The STJ detectors were installed in MS instruments with a variety of ion sources. As an example, we report fragmentation analysis of a non-covalent protein complex of hemoglobin.