Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 29, Issue 11
Displaying 1-8 of 8 articles from this issue
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  • Micellaneous thought at the second oil shock
    Takashi IKENO
    1979 Volume 29 Issue 11 Pages 481-482
    Published: November 30, 1979
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.29.481
    JOURNAL FREE ACCESS
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  • Inside-out inversion process of aluminum tube under axial loading by conical die
    Kanoh ICHINOSE, Taiji MASUDA
    1979 Volume 29 Issue 11 Pages 483-490
    Published: November 30, 1979
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.29.483
    JOURNAL FREE ACCESS
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    The working limit, working load and deforming feature in inverting the finite seamless tube by using blunt conical dies were investigated considering such factors as mean radius (Rom), wall thickness (T0), slenderness ratio of the original cylinder, die cone angle and lubricant. The ratio of the inverting stress (steady inverting load)/(original area of tube section) to the buckling stress mainly depends on the ratio (Rom/T0) and the cone angle. The inverting is bounded by flaring phenomena which occur with samller cone angle and by buckling with such a large one as 180°. When the ratio (Rom/T0) exceeds a certain limit, the inversion becomes imposible. The portion of the tube in the toroidal region just prior to coming in contact with the die surface is subjected to severe compressing and bending in the inverting process. The thickness has a maximum value at that point and becomes less toward the outside. The change of thickness of the outer cylinder is -5 to 10% and the increasement of outer diameter is 20 to 40% of the original.
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  • Irregular and elongated interfacial cell morphologies in aluminum and Al-Cu alloys unidirectionally solidifying in different crystallographic orientations
    Shigeo OYA, Akira SUDO
    1979 Volume 29 Issue 11 Pages 491-497
    Published: November 30, 1979
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.29.491
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    Aluminum and dilute Al-Cu alloys having various combinations of growth orientations unidirectionally solidifying from seed crystals were shock decanted. The cellular morphology is governed by not only growing condition but growth orientation. Irregular cells in which depressions are partially connected on the {100} and {111} growth planes are aligned at random, but those on the {110} growth plane do in the <110> direction. Two types of elongated cells are found, one has straight cell boundaries and the other has corrugated ones. These boundaries are aligned in specific directions on the different growth planes. The direction of the interfacial cell boundaries depends on the geometrical arrangement of growth plane and close-packed {111} planes.
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  • Electrochemical polarization characteristics of aluminum alloys in dilute NaCl solution
    Ken TOHMA, Yo TAKEUCHI
    1979 Volume 29 Issue 11 Pages 498-504
    Published: November 30, 1979
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.29.498
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    The eletrochemical anodic polarization measurement and anodic dissolution test in a solution containing 20ppm Cl- are carried out on aluminum, Al-Mg and Al-Mn alloys to examine pitting corrosion characteristics. The anodic polarization characteristics are considerably affected by stirring the solution, which has a suppression effect on pitting corrosion. Both the current density and stirring the solution in the anodic dissolution test have an effect on the pitting corrosion. The anodic dissolution test is applicable to promote corrosion testing in this solution, if an appropriate current density is used.
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  • Chathodic protection effect of Al-Sn and Al-In alclad materials heated in vacuum
    Hiroshi KAWASE, Motoyoshi YAMAGUCHI, Kazunori ISHIKAWA
    1979 Volume 29 Issue 11 Pages 505-512
    Published: November 30, 1979
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.29.505
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    Vaccum heated Al-Sn and Al-In alloy claddings as sacrifacial composites were tested. The Al-In alclad material heated in vacuum has an excellent cathodic protection effect in both the salt spray test and ASTM water immersion test. Pitting corrosion on the Al-Sn alclad material reaches to the 3003 core material in the salt spray test. This is caused by an over cathodic protection due to high galvanic current between the Al-Sn and 3003 alloy in the salt solution. The pitting depth on the Al-In alclad material is less than that on the Al-Sn alclad material in accordance with different diffusibilities of In and Sn to the core material. The alloys containing Sn and In which have low vapor pressure are superior in contamination protection in the vacuum brazing process to the alloy containing Zn which has high vapor pressure.
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  • Effect of small amount of misch metal on the recrystallization temperature of Al-Zr alloys
    Hajime YAMADA, Hiroshi NISHIUCHI
    1979 Volume 29 Issue 11 Pages 513-518
    Published: November 30, 1979
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.29.513
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    Al-Zr alloys containing 0.1 to 0.2%Zr to which misch metal 0.04 to 1.0% had been added were prepared. The addition of misch metal about 0.2% to the Al-0.2%Zr alloy has a considerable effect to elevate the recrystallization temperature. The effect is accelerated by precipitation heat treatment, but is not in the dilute alloys such as the Al-0.1%Zr alloy. The addition of Ce to the Al-Zr alloys is also effective to elevate the recrystallization temperature, and it seems that such an effect of mish metal or Ce due to the precipitiation of Al3Zr is acclerated by containing misch metal or Ce in the solid solution.
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  • On the structure of unidirectionaly solidified Al-Sn alloys
    Seiki NISHI, Tetsuyuki IKEDA, Tetsuji OHTA, Nobuhisa UDAGAWA
    1979 Volume 29 Issue 11 Pages 519-527
    Published: November 30, 1979
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.29.519
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    Al-5 to 20wt%Sn alloys were unidirectionally solidified in the horizontal direction. The Al-18.5wt%Sn alloy composed of a network type of Sn structure was, in addition, heavily cold-worked and annealed. When the Al-Sn alloys are solidified unidirectionally in the horizontal direction at steep temperature gradient and fast solidification rates, the network structure in which a Sn phase is uniformly distributed results in. When the Al-1.8wt%Sn alloy solidified under such a condition that the network Sn structure is formed is cold-worked at a high reduction ratio and is annealed, the Sn phase is refined. The optimum heat treating condition for refining and the behavior of the Sn phase in recrystallization are also discussed.
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  • High-temperature deformation mechanism in aluminum and its alloys
    Hideo YOSHINAGA
    1979 Volume 29 Issue 11 Pages 528-537
    Published: November 30, 1979
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.29.528
    JOURNAL FREE ACCESS
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