Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 24, Issue 3
Displaying 1-7 of 7 articles from this issue
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  • Microstructure of an Al-Fe alloy produced by unidirectional solidification
    Seiki NISHI, Eiji KATO
    1974 Volume 24 Issue 3 Pages 101-105
    Published: March 30, 1974
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.24.101
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    In relation to the production of composite materials, the present paper studied the influence of the solidification rate on the microstructure of an unidirectionally solidified eutectic Al-Fe alloy. The results obtained are as follows:
    (1) When the solidification rate was less than 10cm/hr, FeAl3 rods were regularly aligned parallel to the solidification direction. However, when the solidification rate was more then 20cm/hr, the microstructure became irregular, as observed in the normal cast structure.
    (2) The eutectic compounds under high and low solidification rate were rods and flakes in shape, respectively. It was found that the rod diameter decreased as the solidification rate increased.
    (3) The interrod spacing, λ, was related to the solidification rate, R, as λ2R=K, where K was 2.7×10-9cm3/sec.
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  • Mechanical properties of Al-Fe eutectic alloy produced by unidirectional solidification
    Seiki NISHI, Eiji KATO, Masahiro DOI
    1974 Volume 24 Issue 3 Pages 106-111
    Published: March 30, 1974
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.24.106
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    Mechanical properties of unidirectionally solidified Al-Fe eutectic composites were compared with those of a normally cast Al-Fe eutectic alloy at various temperatures. The results obrained are as follows:
    (1) The linear portion of the stress-strain curves of the unidirectionally solidified alloy was enlarged and the proportional limit showed a considerable increase. When the solidification rate was 5 to 10cm/hr, the maximum ultimate tensile strength was obtained. The slower solidification rate produced the lower tensile strength.
    (2) The difference of the mechanical properties between the unidirectionally and the normally cast alloys was in the same trend over all the testing temperatures.
    (3) The fracture of the unidirectionally solidified alloy was initiated when the stress carrying FeAl3 fractured after deformation to critical elongation along the tensile direction.
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  • Relation between the contact potential of aluminum oxide films and film formation voltage
    Futoshi KANEMATSU, Tatsuya IMOTO, Joichi SAITO, Takao MURAKAWA
    1974 Volume 24 Issue 3 Pages 112-115
    Published: March 30, 1974
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.24.112
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    The contact potential of oxide films depended on the concentration of acid solutions. Further, when the anodic oxidation was performed under the constant current density, the film formation potential depended on the concentration of acid solutions. By comparing the contact potential and the oxide film formation potential, the following conclusions were made:
    (1) As the film formation potential increased in the oxalic acid, the work function of the oxide films increased.
    (2) If the magnitude of the steep rise in the oxidation potential was large, the work function of the oxide films became small when the sulfuric acid was used.
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  • The effect of the adsorbed stearic acid monolayer on the surface potential of aluminum oxide films
    Futoshi KANEMATSU, Tatsuya IMOTO, Joichi SAITO, Takao MURAKAWA
    1974 Volume 24 Issue 3 Pages 116-120
    Published: March 30, 1974
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.24.116
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    The purpose of the present paper was to study the change in surface potential of oxide films on aluminum by the adsorbed stearic acid monolayer. It was found that the adsorption of the stearic acid increased remarkably the surface potential of porous oxide films of which the magnitude did not depend on the methods of the anodic treatment. However, the adsorption on the sealing and the barrier type films resulted in a small decrease in the surface potential.
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  • Reaction between vitreous SiO2 and Al
    Akira KITAHARA, Koji IMAGAWA, Sumio NAGATA, Shigeru AKIYAMA, Hidetoshi ...
    1974 Volume 24 Issue 3 Pages 121-125
    Published: March 30, 1974
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.24.121
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    Rate of reaction between Al and SiO2 in vitreous silica or in silicate was measured between 500°C and 600°C in air or vacuum. The reaction couples used in the study were aluminum-silica glass and aluminum-Shirasu Balloon, which was a hollow microsphere of aluminosilicate glass. In the present study, it was found that the rate determining stage of the reaction between SiO2 and Al was associated with breaking of a Si-O bond. Apparen+ activation energies of the reaction are 56.5cal/mol for the silica glass-aluminum system and 78.7cal/mol for the Shirasu Balloon-aluminum system, respectively.
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  • Effects of tin addition on the low temperature aging in aluminum-copper alloys
    Hiroshi KIMURA
    1974 Volume 24 Issue 3 Pages 126-129
    Published: March 30, 1974
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.24.126
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  • Hydrogen and porosities in aluminum (2)
    Seiki NISHI, Yoshie SHINADA, Tatsushi KUROBUCHI
    1974 Volume 24 Issue 3 Pages 130-134
    Published: March 30, 1974
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.24.130
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