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 10
Displaying 1-8 of 8 articles from this issue
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  • Expectation
    Motoo ITAGAKI
    1979 Volume 29 Issue 10 Pages 429-430
    Published: October 30, 1979
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.29.429
    JOURNAL FREE ACCESS
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  • Some properties of Al-Pb-Cu sintered alloys
    Tomoshi TAKAHASHI, Michitomo KATO
    1979 Volume 29 Issue 10 Pages 431-436
    Published: October 30, 1979
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.29.431
    JOURNAL FREE ACCESS
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    The basic properties of sintered Al-10% Pb-1-6% Cu alloys such as dimensional change, sintered density, hardness and radial crushing strength were examined. The compacts expand during sintering at 540°to 610°C in the purified hydrogen atomsphere because of pore generation at the eutectic temperature of the Al-Cu system and formation of a liquid Pb phase. This expansion shall also be considered from the viewpoint of evolution and expansion of gases absorbed in the liquid phase. The suitable Cu content 4% and the optimum temperature and time for sintering respectively about 580°C and 2hr are recommended on the basis of the combination of basic properties of the alloys sintered under pressure 1ton/cm2.
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  • The effect of Ti or Ti-B on grain size and mechanical properties of Al-7%Si-0.3%Mg casting alloy
    Makoto TSUKUDA, Tosio SUZUKI, Izumi FUKUI, Masayuki HARADA
    1979 Volume 29 Issue 10 Pages 437-444
    Published: October 30, 1979
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.29.437
    JOURNAL FREE ACCESS
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    The alloys to which different concentrations of Ti or Ti-B had been introduced were cast in the JIS permanent mold and an insulating mold. Additions of Ti or Ti-B0.04% or more and 0.08% or more lead to respectively micro-grain refining and macro-grain refining in the alloy solidified at a same cooling rate. The cooling rate particularly at an early stage of solidification is more important than the Ti or Ti-B addition to govern the grain size and the mechanical properties particularly eleongation and ultimate strength. The grain refining effect is maintained during melting for 3hrs., and that of Ti-B for 7hrs. The grain refining effect of Ti disappears in remelting, and that of Ti-B remains in second remelting.
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  • Effects of cold rolling on the phase change of Al6Fe to Al3Fe in an Al-0.5%Fe alloy
    Hisashi SUZUKI, Motohiro KANNO, Hideo TANABE
    1979 Volume 29 Issue 10 Pages 445-450
    Published: October 30, 1979
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.29.445
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    The phase change of metastable Al6Fe to stable Al3Fe phase in an Al-0.5%Fe alloy affected by cold rolling was studied in detail by means of optical and transmission electron microscopies etc. The alloys as-cast and cold-rolled were isothermally annealed at 500 to 600°C for short times mainly up to 30sec. Working accelerates the phase change. The reason is attributed to the facts that: The Al6Fe rod is divided into several parts, the number of which increases with the rolling reduction; The Al3Fe phase nucleates during annealing at the front of divided rod. The total number of Al3Fe nuclei increases in the cold-rolled alloy than in the usual as-cast alloy.
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  • Effects of cooling rate on dislocation density in annealed aluminum sheets
    Yasuhiro MIURA, Minoru FURUKAWA, Kenji FUJIYAMA, Hiroya KAIEDA
    1979 Volume 29 Issue 10 Pages 451-457
    Published: October 30, 1979
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.29.451
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    The dislocation structure in aluminum sheets at elevated temperatures and at room temperature was revealed by an X-ray transmission topography. The density of randomly curved dislocations linearly increases with increasing cooling rate. The higher rate of cooling also gives rise to a larger number of row of prismatic dislocation loops, while the length of a row becomes shorter. Stability and mechanism of formation of prismatic dislocation loops are discussed taking the concentration of excess vacancy and nature of sinks for vacancy into consideration.
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  • Gas extraction processes and observation of gas evolution curves in aluminum by the vacuum extraction method
    Yoshiei SHINADA, Seiki NISHI
    1979 Volume 29 Issue 10 Pages 458-464
    Published: October 30, 1979
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.29.458
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    Most of blank and surface gases from a boat and a specimen in the vacuum gas extrcttion method is attributed to adsorption of gases in air. The value of blank or surface gas occupies 50% of the total extraction gas content when the specimen contains a small amount of gas. When the specimen is heated on the boat in the vacuum hot extracting apparatus (VHE), diffusive hydrogen starts to be extracted from about 15min. and completes after 45min. When the specimen is directly heated without the boat, extraction of hydrogen is so accelerated that the extraction time is shortened by 15 to 20min. Although the vacuum fusion extraction method (VFE) appreciably shortens the extraction time as compared with the VHE method, the advantage of time saving is counterbalanced when extracting only the diffusive hydrogen, because the blank gas of the vessel shall be considered.
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  • Behavior of molecular hydrogen in aluminum and its extraction process
    Yoshiei SHINADA, Seiki NISHI
    1979 Volume 29 Issue 10 Pages 465-472
    Published: October 30, 1979
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.29.465
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    The vacuum hot extraction (VHE) and the vacuum fusion extraction (VFE) methods were tried. Molecular hydrogen in aluminum having gas pores is extractive by the VHE method. The extraction proceeds through the dissociation, dissolution, diffusion and evolution processes. The molecular hydrogen requires time for extraction so longer than the diffusive hydrogen as 4hrs or more. In the VFE method, molecular hydrogen is completely extracted within 1hr. Hydrogen in aluminum having gas pores is extracted by the VHE method in the following three steps in accordance with elevated temperatures: (i) When the pores 10-2cm or more in radius in the surface layer up to 13μ in depth attain the internal gas pressure 16.5 atm or more at 250°to 480°C, they grow as blisters and evolves molecular hydrogen. Hydrogen extracted from the blisters is less than 0.04cc/100g. (ii) Hydrogen 0.61cc/100g in solution diffused in aluminum cast in a green sand mold is extracted at 480°to 660°C, Hydrogen over this value forms pores and remains in molecular state. And (iii) The residual molecular hydrogen is extracted at above 660°C.
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  • On the quantitative measurement of the microstructures
    Shigenori HORI
    1979 Volume 29 Issue 10 Pages 473-479
    Published: October 30, 1979
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.29.473
    JOURNAL FREE ACCESS
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