Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 63, Issue 3
Displaying 1-6 of 6 articles from this issue
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RESEARCH ARTICLE
  • Hydrogen evolution reaction and its analysis on aluminum in sulfuric acid
    Osami Seri, Yuji Hosoi, Daichi Sasaki
    Article type: RESEARCH ARTICLE
    2013 Volume 63 Issue 3 Pages 95-100
    Published: March 25, 2013
    Released on J-STAGE: April 30, 2013
    DOIhttps://doi.org/10.2464/jilm.63.95
    JOURNAL FREE ACCESS
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    Efforts by trial and error between experimental measurements and theoretical approaches have been made to obtain electrochemical parameters of hydrogen evolution reaction occurred on aluminum in sulfuric acid solution. Polarization curves of aluminum in 0.01, 0.1 and 0.5 mol·dm-3 sulfuric acid solutions with dissolved oxygen-free and stagnant conditions were measured and analyzed by the polarization resistance method. The method reveals that the electrochemical characteristics of hydrogen evolution reaction on aluminum in sulfuric acid solution had the exchanged current density of i0=10-4.5 mA·cm-2 in 0.5 mol·dm-3 sulfuric acid solution, which generally corresponded with published data elsewhere.
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  • Recrystallization behavior in 1050 aluminum after cold-rolling
    Takuya Kajiura, Masaaki Tsukamoto, Atsushi Yamamoto
    Article type: RESEARCH ARTICLE
    2013 Volume 63 Issue 3 Pages 101-105
    Published: March 25, 2013
    Released on J-STAGE: April 30, 2013
    DOIhttps://doi.org/10.2464/jilm.63.101
    JOURNAL FREE ACCESS
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    Microstractural changes in 1050 aluminum alloy sheets were observed on the same area in a specimen with SEM-EBSD system. Specimens were heat-treated at 823 K for 3.6 ks. The specimen was cold-rolled at a reduction rate of 75% and then annealed at 623 K. Intermittent annealing using a salt bath, Ar ion-polishing and EBSD measurement were repeated. In an area composed of small grains before cold-rolling and an area close to prior grain boundaries, recrystallized grains were formed at the early stage of annealing. Strain induced grain boundary migration (SIBM) was observed in the latter area, although the reduction rate is much higher than those reported in the literatures. The prior grain boundary did not spontaneously migrate but migrated with a growth of dislocation cell formed nearby the boundary. The recrystallized grain formed through the SIBM mechanism has a low angle boundary as an interface between the mother grain, which was immobile. The low angle boundary changed into a high angle boundary after the mother grain was made inroads by other recrystallized grains. Low angle boundaries are not always immobile but migrate in some cases remaining behind a low strained area, and encounters other boundary to form a recrystallized grain.
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  • Shape precision improvement of impact extruded 3003 aluminum alloy square cups by means of ironing
    Nobuhiro Koga, Wenhe Jiang, Jyunji Kageyama, Toshihiko Suzuki
    Article type: RESEARCH ARTICLE
    2013 Volume 63 Issue 3 Pages 106-110
    Published: March 25, 2013
    Released on J-STAGE: April 30, 2013
    DOIhttps://doi.org/10.2464/jilm.63.106
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    Electric vehicles and emergency batteries will be increasingly required and widely used in the future. With this background, there is demand for new technologies that can efficiently produce containers with a rectangular cross section (square cups) used for the battery cases which are essential for electric vehicles and emergency batteries. In this study, we clarified that the large square cups can be formed by impact extrusion, which is more efficient than deep drawing. In addition, we also clarified that the square cups with increased shape accuracies and uniform thickness in their side walls can be obtained by performing ironing after impact extrusion, enabling the successful forming of high-accuracy square cups that can be used for battery cases. Moreover, concerning the thin-wall edge for positioning a plate lid that is subsequently attached to square cups along one of their edges, we proposed a new method of forming the thin-wall edge at the sometime during the ironing step.
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  • Effect of heat treatment condition on elongation of H1n-tempered Al–Mn alloy with layered structure
    Michihide Yoshino, Shohei Iwao, Shuu Kuroda
    Article type: RESEARCH ARTICLE
    2013 Volume 63 Issue 3 Pages 111-117
    Published: March 25, 2013
    Released on J-STAGE: April 30, 2013
    DOIhttps://doi.org/10.2464/jilm.63.111
    JOURNAL FREE ACCESS
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    The effect of heat treatment condition on elongation of H1n-tempered Al–Mn alloy with layered structure has been investigated. Uniform elongation and local elongation were measured respectively. The work hardening exponent (n value) increased with decreasing size and increasing density of dispersoid, and thus uniform elongation was improved. On the other hand, local elongation increased with refinement and homogenization of dislocation structure. It is considered that strain rate sensitivity exponent (m value) increases as dislocation structure becomes finer and more homogeneous, and thus localization of necking was inhibited and relatively homogeneous deformation continued up to higher strain.
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