Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 50, Issue 4
Displaying 1-6 of 6 articles from this issue
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RESEARCH REPORT
  • Influence of the coating components and surface pretreatment for coating on hydrophilicity of aluminum fin-stock
    Kenichi KAMITANI, Yosuke OHTA, Yoshikazu MUKAI, Koichi HATANAKA
    2000 Volume 50 Issue 4 Pages 147-151
    Published: 2000
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.50.147
    JOURNAL FREE ACCESS
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    We studied the influence of the water-soluble resin content and the Cr weight of pretreatment on hydrophilicity of the coating with alkaline silicate of aluminum fin-stock. It was clarified that by increasing the water-soluble resin content to the coating with alkaline silicate, the surface coating morphology got roughed. Further, as the actual surface area of the coating increased, the hydrophilicity was improved. In the case of low Cr weight of pretreatment, the coating with alkaline silicate was easily dissolved. On the contrary, in the case of too high Cr weight, the surface coating morphology was flat, and the hydrophilicity was decreased. Therefore, Cr weight of pretreatment must be appropriate, in order that the hydrophilicity may be improved.
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  • High temperature strength of Mg–Zn–Ca alloy improved by mischmetal and zirconium additions
    Toshio HORIE, Hiroaki IWAHORI, Yoshiki SENO, Yoji AWANO
    2000 Volume 50 Issue 4 Pages 152-156
    Published: 2000
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.50.152
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    Mischmetal and zirconium were added to the Mg–Zn–Ca alloy in order to strengthen. The high-pressure die castings of this alloy have higher ultimate strength than 200 MPa between room temperature and 150°C. The minimum creep rate of the gravity die-castings of this alloy is lower than that of QE22–T6 below 100 MPa at 150°C. Fine precipitate with a size of 5 nm is found by TEM observation of the as-cast and T6–treated specimens. T6–treated specimen has higher precipitate density than the as-cast one. It is considered that the precipitate contributes to the improvement on mechanical properties.
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  • Mechanically mixed layer in weld interface and mechanical properties of friction welded 5052/2017 aluminum alloys joints
    Hirotaka FUWANO, Kazuyoshi KATOH, Hiroshi TOKISUE
    2000 Volume 50 Issue 4 Pages 157-161
    Published: 2000
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.50.157
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    The mechanically mixed layer at a weld interface and the mechanical properties of dissimilar welded joints of 5052 aluminum alloy to 2017 aluminum alloy, which were made by using a brake type friction welding machine were examined with different welding conditions. The mechanically mixed layer is formed on the friction process, and it is observed at a weld interface all over. The thickness of the mechanically mixed layer decreased with increasing friction pressure, the mixed layer of the outside of joint became thinner than that at the center. The tensile strength of joints which were made with the friction pressure of above 45 MPa, which had an average thickness of 200 μm in mechanically mixed layer, showed 85% of 5052 aluminum alloy base metal. The breakage occurred at the softened area of 5052 aluminum alloy side. The impact strength of joints, which had an average thickness of 200 μm in mechanically mixed layer, were 70% of 5052 aluminum alloy base metal.
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  • Thermal conductivity at about 85 K and electrical resistivity at 77 K of Ti–15 mass%V–3 mass%Cr–3 mass%Sn–3 mass%Al alloy
    Masahiko IKEDA, Shin-ya KOMATSU, Takashi SUGIMOTO, Katsumi MINAMIYAMA
    2000 Volume 50 Issue 4 Pages 162-165
    Published: 2000
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.50.162
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    Thermal conductivity at about 85 K, κ, and resistivity at liquid nitrogen temperature (LN), ρLN, of a Ti–15 mass%V–3 mass%Cr–3 mass%Sn–3 mass%Al (Ti–15–3) alloy in variously aged states were measured by steady state method and direct current 4-contacts method, respectively. Thermal conductivity at room temperature (RT) and about 85 K of the Ti–15–3 alloy specimens quenched from 1073 K was smaller than that of other titanium alloys and SUS304 stainless steel. Thermal conductivity at about 85 K was increased by accumulative isochronal aging (step heating) up to 823 K and by isothermal aging at 773 K, while resistivity at LN decreased with the aging. The increase and the decrease were ascribed to α precipitation. All values of thermal conductivity measured in the aged Ti–15–3 alloy were about a half of that of SUS304 stainless steel. Relationship between thermal conductivity at about 85 K and the average measuring temperature in steady state divided by the resistivity at LN was almost linear, and regressed equation was κ = 0.11(ρLN−1T) −1.60, where the units are W·m−1·K−1 for κ, μΩ·m for ρLN and K for T.
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