Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 59, Issue 6
Displaying 1-8 of 8 articles from this issue
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RESEARCH REPORT
  • Aptitude evaluation of alumina coated with aluminum borate crystals as filter material for molten aluminum
    Osamu Yamakawa, Hiroshi Shirakawa, Osamu Sakurada, Minoru Hashiba
    Article type: Research Report
    2009 Volume 59 Issue 6 Pages 284-289
    Published: June 30, 2009
    Released on J-STAGE: July 30, 2009
    DOIhttps://doi.org/10.2464/jilm.59.284
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    We studied fabrication of improved alumina tube filter component coated with aluminum borate crystal 9Al2O3·2B2O3 (9A2B) for filtration of molten aluminum. The 9A2B crystals were not be formed by heating an Al2O3–B2O3–CaO glass frit. It was necessary to add Al2O3 material to the frit for forming the 9A2B crystals on alumina grain. XRD results showed that 9A2B crystals were formed at 1100°C and grown to 1200°C, and more grown into cooling down process from 1200 to 1000°C. As compared with the conventional tube filter coated with boric silicate glass, the alumina filter components had high strength until 1200°C, small thermal expansion, little pollution to molten aluminum, and little corrosion by not wetting to molten aluminum.
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  • Effect of hot rolling pass schedule on recrystallization structure of 1100 aluminum sheets
    Shin Tsuchida
    Article type: Research Report
    2009 Volume 59 Issue 6 Pages 290-294
    Published: June 30, 2009
    Released on J-STAGE: July 30, 2009
    DOIhttps://doi.org/10.2464/jilm.59.290
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    The hot rolling pass schedules in a mass productive rolling line were examined to confirm the effect on recrystallization structure of commercial purity aluminum sheets. In the conventional hot rolling condition of 43% reduction for each pass in the 3-stands finishing mill, well developed cold rolling texture and taller 45°-4 ears of the drawn cup are obtained for the cold rolled sheets. These tall 45° ears tend to change into 0°/90°ears after the final annealing. However, in the case of 53% reduction for each pass in the finishing hot rolling, moderately tall 45°-4 ears of the cold rolled sheet have become a little bit smaller after the final annealing. The less change of 45° ear in the latter case is due to continuous recrystallization by the pinning of fine second phase particles which are estimated to be precipitated on the deformation structure during and after the higher reduction passes in the finishing hot rolling.
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  • Generation of super smooth surface in compression of aluminum
    Masahito Matsui, Yuichi Nakamura
    Article type: Research Report
    2009 Volume 59 Issue 6 Pages 295-299
    Published: June 30, 2009
    Released on J-STAGE: July 30, 2009
    DOIhttps://doi.org/10.2464/jilm.59.295
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    In order to obtain fundamental information about generation of super smooth surface in metal forming, a simple compression test of aluminum strips is carried out. The tool and specimen surfaces are observed on the nanometer scale by atomic force microscope (AFM). It is found that the specimen surface asperities are smoothed to the almost same surface roughness as the tool on the nanometer scale at about 20% compressive strain. The maximum height in scanning range 20×20 μm2 and 500×500 nm2 are attained to 8 nm and 1 nm at the smoothest position of the specimen profiles, respectively. The tool and specimen surfaces are examined by the power spectrum method and the zeroset method of fractal analysis.
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  • Deep drawing with developed blank of aluminum sheet without blank holder
    Nobuo Hatanaka, Takashi Iizuka, Norio Takakura, Katsuhiko Yamaguchi
    Article type: Research Report
    2009 Volume 59 Issue 6 Pages 300-304
    Published: June 30, 2009
    Released on J-STAGE: July 30, 2009
    DOIhttps://doi.org/10.2464/jilm.59.300
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    Using the developed blank, it is possible to form the deep container in one stage. The conventional deep drawing is carried out using punch, die and blank holder. Deformation of divided flange portion of the developed blank seems to be small in the deep drawing. It is possible to carry out the processing without blank holder. When the blank holder is not used, the processing condition in which the forming become very severe. If the case in which the blank shape is not appropriate, gap occurs between flanges or overlap generate on the flange. In this paper, the examination was carried out in detail on flange state of the developed blank. The result was showed that the shape of the flange is no necessity of satisfying the condition of “the circular arc length is constant”, and the forming is possible in the flange of shape of “parallel linear”. Blank shape that was optimum for carrying out the drawing without blank holder was clarified.
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  • Influences of homogenizing temperature and excess Si on age-hardening behavior of Al–Mg–Si alloys
    Takeo Sakurai, Shin-ya Komatsu, Norio Kono
    Article type: Research Report
    2009 Volume 59 Issue 6 Pages 305-309
    Published: June 30, 2009
    Released on J-STAGE: July 30, 2009
    DOIhttps://doi.org/10.2464/jilm.59.305
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    Influences of homogenizing temperature and excess Si on age-hardening behavior of Al–0.93%Mg2Si alloy were investigated. From size distribution obtained by image analysis of secondary phase particles on SEM micrographs, amount of Mg–Si compound in the excess Si alloy was decreased from that in the as-cast state by homogenization at 823 K for 7.2 ks. The amount of Mg–Si compound after homogenization at 773 K lays between those in the as-cast and 823 K homogenized states. Estimating from the analyzed chemical composition, complete dissolving temperature of Mg and Si of the excess Si alloy is 782 K. Conductivity IACS% was decreased with elevating temperature of homogenization, confirming the decrease in amount of the Mg–Si compound and increase in solute concentration. Though the complete dissolving temperature of Mg and Si is elevated, excess addition of only 0.18%Si brings about a strengthening larger than the previously reported alloy containing 0.47%Cu.
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RESEARCH NOTE
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