Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 15, Issue 6
Displaying 1-8 of 8 articles from this issue
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  • Building's Cleaning
    Tojiro KOBAYASHI
    1965 Volume 15 Issue 6 Pages 333-334
    Published: November 30, 1965
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.15.333
    JOURNAL FREE ACCESS
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  • A study on the Al-Zn-Mg alloys (3rd Report)
    Takuichi MORINAGA, Tsuneo TAKAHASHI, Junichiro YAMASHITA
    1965 Volume 15 Issue 6 Pages 335-339
    Published: November 30, 1965
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.15.335
    JOURNAL FREE ACCESS
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    A study was made to explain the effects of Cr and Mn on the mechanism of aging and anti-corrosion properties of Al-Zn-Mg permanent mould casting alloys; the one containing 3% Zn and 1.8% Mg as basemetal and the others containing further 0.3% Cr and 0.3% Cr+0.5% Mn being added to the basemetal.
    The results obtained are summariged as follows:
    (1) In the experiments of the natural aging at room temperature, hardness approximately approaches to a stable state since 28-35 days after the casting.
    Hardness of the alloys of the basemetal-Cr and basemetal-Cr-Mn is slightly higher than that of the basemetal.
    2) In the T5 treatment, the peak value of strength is obtained by the treatment for 12hr at 160°C.
    3) In the measurement of electrode-potential, high potential is obtained by the alloy of Cr and Mn addition on by hear-treatment. The potential of 3% Zn-1.8% Mg system alloys is higher than that of 4% Zn-2% Mg system alloys.
    It is expected that the above experimental results would be helpful to the future studies on welding structual alloys.
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  • Experimental analysis on the extrudability of 6063 alloy
    Kanji TAKEUCHI, Yoshiyuki KOBAYASHI, Takashi KIKUCHI
    1965 Volume 15 Issue 6 Pages 340-347
    Published: November 30, 1965
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.15.340
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    This study is of obtaining an experimental equation by which the maximum extrusion pressure may be calculated.
    The 6063 billets carted in permanent mold which have circular and square sections were extruded by 600 ton-vertical type oil hydraulic press.
    Authers obtained the next experimental equation, and found that the equation will be reliable with ±3% error and be able to be applied for other sectional extrusions.
    P=9.95(t/305)-λ0×(βlogeA/a+4μ0L/D)
    λ0=1.70(v/10)-0.108
    μ0=0.52-1.054log(t/305)
    P: Maximum pressure of extrusion kg/mm2
    t: Extrusion temperature °C
    v: Extrusion speed m/min
    L: Length of billet mm
    D: Diameter of billet mm
    β: Shape factor
    β=1 For extrusion of the circular section
    0.90<β<1 For extrusion of the square section and A/a=Cross sectional area of billet/Cross sectional area of extruded product: Extrusion ratio.
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  • On Al-Zr alloys (1st Report)
    The effect of casting temperature on the recrystallization characteristics of Al-Zr alloys
    Takashi ARAKI, Shinichi KOMORI
    1965 Volume 15 Issue 6 Pages 348-353
    Published: November 30, 1965
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.15.348
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    The effect of casting temperature responding to Zr content on recrystallization of Al-Zr alloys was investigated.
    The results obtained were summarized as follows.
    (1) Casting the alloy from the temperature of solid-liquid region, yielding of Zr decreased, segregation of Zr appeared, and the recrystallization temperature became low.
    (2) Casting the alloy from the temperature just above liquidus, the yielding of Zr didn't decrease, no segregation of Zr was observed, and the recrystallization became high.
    (3) Casting the alloy from the temperature about 100°C above liquidus, the recrystallization temperature was not so high.
    (4) Precipitation heat treatment of ingot was effective to level up the recrystallization temperature in the alloy cast from the temperature about 100°C above liquidus.
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  • On the Al-Zr alloys (2nd Report)
    The effect of mass of ingot on the recrystallization and the characteristics of Al-Zr alloys
    Takashi ARAKI, Shinichi KOMORI
    1965 Volume 15 Issue 6 Pages 354-360
    Published: November 30, 1965
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.15.354
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    As the mass of ingots of Al-Zr alloy becomes larger, especially in the case of a Zr rich alloy, the center region constitutes the equiaxed structure and the columnar structure appears in the part of ingot in contact with the mould where the metal is cooled rapidly.
    The results are summerized as follows:
    (1) The difference in characteristics of recrystallization between the chilled zone and the center were recognized in the case of ingots whose thickness exceed 30mm and in the alloy containing over 0.23wt% of Zr.
    (2) The recrystallization temperature of columnar zone is generally high but that of equiaxed structure is not so high. Precipitates become finer and fewer in columnar zone than in the equiaxed zone. Electrical resistance of the drawn wire from the equiaxed zone is also much lower than that of from the columnar zone.
    (3) The precipitation heat treatment after cold rolling is effective to level up recrystallization temperature of a Zr dilute alloy, but is not entirely effective to that of an equiaxed zone.
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  • Study on the reaction between magnesium oxide and aluminium, and aluminium-iron alloy
    Tomoo MATSUSHIMA, Shigeru OYAMA
    1965 Volume 15 Issue 6 Pages 361-366
    Published: November 30, 1965
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.15.361
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    The equilibrium pressure of magnesium over the reaction between magnesium oxide and aluminium was measured by means of the transportation method. The range of temperature was from 1, 000°C to 1, 150°C.
    Results are expressed by following equations.
    4MgO(s)+2Al(Mg)(l)=3Mg(g)+MgAl2O4(s)
    logPMg(mmHg)=-9, 503/T+8.852
    The X-ray analysis of the end product showed the formation of the magnesium aluminate.
    It was also carried out to determine activities of aluminium in aluminium-iron alloys at 1, 100°C. Some more details of these reactions were discussed making reference to previous works.
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  • The nature of IIa Oxides in cryolite melts: On the system of cryolite-MgO, -CaO, and -BaO
    Tomoo MATSUSHIMA, Kenji ONO
    1965 Volume 15 Issue 6 Pages 367-376
    Published: November 30, 1965
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.15.367
    JOURNAL FREE ACCESS
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    The nature of IIa Oxides, particularly MgO, CaO and BaO, in cryolite melts was studied by means of the freezing point depression of cryolite. In the binary system of these melts, the displacement reaction accompanied and the formation of fluorides and aluminate were observed by the X-ray diffraction analysis.
    As the mechanism of the reaction, it is the most probable that the formation of complex ions of Al2O3- and MgF3- occures in the system of cryorite-MgO, while the formation of AlO2- and the dilution of Na+ by Ca2+ or Ba2+ are almost identical in the system of cryolite -CaO, and -BaO.
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  • A study of grain-size measuring about aluminium and its alloy sheet
    Technical Committee Of Light Metal Rolling Industr
    1965 Volume 15 Issue 6 Pages 377-389
    Published: November 30, 1965
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.15.377
    JOURNAL FREE ACCESS
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