Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 39, Issue 6
Displaying 1-11 of 11 articles from this issue
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  • Cutting performance of diamond deposited tool for Al-18 mass%Si alloy
    Masaru YAGI, Kohsuke SAIJO, Yuji KATSUMURA, Hisashi SUZUKI
    1989 Volume 39 Issue 6 Pages 417-422
    Published: June 30, 1989
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.39.417
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    Diamond film was deposited on the substrate (WC-4%Co) with different surface conditions using microwave-plasma CVD, and adhesion strength of the film and cutting performance of diamond deposited tools were studied. Adhesion strength of the film was most excellent, when deposited on the as-sintered substrate probably because the amount of graphite which deposited at the interface between diamond film and substrate became to be of least. The result of cutting tests for Al-18%Si alloy showed that the flank wear was smallest, when diamond film was deposited on the assintered substrate, corresponding to the result of adhesion strength of the film. The wear-mechanism of diamond deposited tools is discussed.
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  • Effects of forming factors on production of wide clad aluminum alloy foils by single roll rapid solidification
    Mitsugu MOTOMURA, Toshio HAGA
    1989 Volume 39 Issue 6 Pages 423-430
    Published: June 30, 1989
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.39.423
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    Production of rapidly solidified aluminum alloy clad foils with 160mm width were attempted by use of a single roll apparatus with tandem nozzles, controlling some forming factors, ie. roll speed, thickness and width of the base foil and overlying foil, order of ejection of molten alloys from two nozzles, distance between nozzles, combination of alloys for base and overlying foils. When roll speed is low or distance between nozzles is not suitable, there are cracks and disturbed layer at interface between base and overlying foils. Sound clad foil is achieved by decreasing width and thickness of overlying foils less than those of base foils. Materials and surface condition of base foils affect the surface condition of overlying foils. Combinations of alloys for base and overlying foils affect formation of crinkles of clad foil.
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  • Pitting corrosion behavior of Al-Li alloys
    Shuhei OHSAKI, Tsuneo TAKAHASHI
    1989 Volume 39 Issue 6 Pages 431-436
    Published: June 30, 1989
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.39.431
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    The effect of aging on the pitting corrosion behavior of three Al-Li-Cu-(Mg)-Zr alloys (2090, 8090 and 8091) was studied. The pitting potentials of these alloys are dependent on Cu content, becoming positive with increasing Cu content. The alloys in the underaged condition are susceptible to intersubgranular corrosion due to the preferential pitting dissolution of the Cu depleted zone formed along the subgrain boundaries. The susceptibility to intersubgranular corrosion of the alloys aged for 86.4ks at 443K is ranked in the order of 8091>8090>2090. The alloy 2090 is apt to lead a general corrosion due to the dimple type pitting corresponding to T1 precipitates in the grain interiors. The pitting corrosion behavior of these alloys is closely related to the morphology of the precipitate phases of T1 and S'.
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  • Grain growth induced by superplastic deformation in Al-5%Mg-0.6%Mn alloy
    Eiichi SATO, Kazuhiro ITAYA, Kazuhiko KURIBAYASHI, Ryo HORIUCHI
    1989 Volume 39 Issue 6 Pages 437-443
    Published: June 30, 1989
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.39.437
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    The grain growth behavior was measured during superplastic deformation in Al-5%Mg-0.6%Mn alloy, which had fine, equiaxied and second phase particle dispersed structure. The deformation induced component of grain growth could be denoted by (D/Ds), where D and Ds were grain sizes after deformation and after the equivalent annealing without deformation, respectively: this component was presented as In (D/Ds)=αε with α=0.6, independent of strain rate, deformation temperature, initial grain size, and the static component of grain growth. Flow hardening was equal to that expected from the grain growth and the dependency of flow stress on grain size.
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  • Precipitation study of an Al-0.25mass%Sc alloy
    Naoyuki SANO, Hyung-ho JO, Ken-ichi HIRANO, Toshio SAKURAI
    1989 Volume 39 Issue 6 Pages 444-450
    Published: June 30, 1989
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.39.444
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    The precipitation process during aging at 573K of an Al-0.25mass%Sc alloy has been investigated by means of electrical resistivity and hardness measurements, transmission electron microscopy (TEM) and atom-probe field ion microscopy (AP-FIM). It was found that spherical particles of the Al3Sc phase having the L12 structure precipitate homogeneously from beginning. The coarsening of the particles follows the Lifshitz-Wagner rule after the completion of the nucleation-and-growth stage, and the particles have the coherency with the matrix even in the over-aged state. The composition of the precipitates was measured using the AP-FIM. The Sc concentration of the precipitates was less than the equilibrium value (25at.%) at the early stage of aging and reached to 25at.% upon over-aging.
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  • Improvement in the impact strength of JIS AC2B aluminum alloy castings solidified for a long time
    Yoshihiro SHIMIZU, Yoji AWANO, Shohji HOTTA, Motoyuki NAKAMURA
    1989 Volume 39 Issue 6 Pages 451-456
    Published: June 30, 1989
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.39.451
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    In order to improve the strength of Al-Si-Cu alloy castings solidified for a long time, solution heat treatment for extremely long time or non-equilibrium eutectic melting solution treatment has been performed. The reason is discussed why normal T6 heat treatment is not effective while long time solution heat treatment or non-equilibrium eutectic melting solution treatment is effective for increasing the strength. By normal T6 treatment, non-equilibrium Cu bearing compounds are little dissolved, and the shapes of eutectic Si phase as well as Fe bearing compound are not changed. On the other hand, both dissolution of Cu bearing compounds and spheroidization of eutectic Si are promoted by extremely long time solution treatment or non-equilibrium eutectic melting solution treatment. Needle-like iron bearing compounds are refined only by the latter treatment. It is concluded that these factors will be responsible for increasing of the impact strength.
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  • A novel technique for the investigation of corrosion of aluminum beneath organic coatings
    Kenzo KOBAYASHI, Ken-ichi SHIMIZU, Yasuhiro TSUDA
    1989 Volume 39 Issue 6 Pages 457-459
    Published: June 30, 1989
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.39.457
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  • Development and application of pre-sensitized printing plate -MULTIGRAIN-
    Hirokazu SAKAKI, Tsutomu OHMURA, Toshitaka KAWAMURA
    1989 Volume 39 Issue 6 Pages 460-465
    Published: June 30, 1989
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.39.460
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  • Melting and melt refining of aluminum
    Ryotatsu OTSUKA
    1989 Volume 39 Issue 6 Pages 466-476
    Published: June 30, 1989
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.39.466
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  • Anodizing of Aluminum in Japan
    Toshihiko SATO
    1989 Volume 39 Issue 6 Pages 477-478
    Published: June 30, 1989
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.39.477
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  • [title in Japanese]
    1989 Volume 39 Issue 6 Pages 479-480
    Published: June 30, 1989
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.39.479
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