Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 27, Issue 10
Displaying 1-8 of 8 articles from this issue
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  • Technology and education
    Masuteru MARUYAMA
    1977 Volume 27 Issue 10 Pages 463-464
    Published: October 30, 1977
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.27.463
    JOURNAL FREE ACCESS
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  • Recovery of aluminum from red mud
    Tatsuhiko EJIMA, Kazuyoshi SHIMAKAGE, Masayoshi HOSHI
    1977 Volume 27 Issue 10 Pages 465-472
    Published: October 30, 1977
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.27.465
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    Red mud containing sodalite reacts with ammonium bisulfate at 400°C to 450°C to form double salt of an ammonium aluminum sulfate soluble in water. Aluminum and iron were leached in water or in sulfuric acid after the sulfatizing roasting. A pH control process was examined to remove ferric ion in the leaching solution. The optimum conditions for removing ferric ion in the leaching solution are: temperature 90°C, pH3.5 and time 2 hours. The final recovery of aluminum can exceed 80% under these conditions.
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  • Effects of hydrogen on tensile properties of Al-8%Mg alloy
    Tadakazu OHNISHI, Tatsuo HARA, Yoshitaka MOHRI, Yoshizo NAKATANI
    1977 Volume 27 Issue 10 Pages 473-479
    Published: October 30, 1977
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.27.473
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    Hydrogen charging and room temperature aging were carried out on the Al-8%Mg alloy aged at 170°C for 24hr. Tensile tests were made under a constant rate 0.05cm/min. The ultimate tensile strength and elongation are decreased with increasing the time of hydrogen charging, namely the hydrogen content, but the 0.2% proof stress is unchanged. The ductility is completely recovered during aging at room temperature. Penetration of hydrogen results in grain boundary embrittlement. The degree of embrittling is in proportion to the content of hydrogen. Diffusionable hydrogen occuping the octahedral site potentially causes embrittlement of the alloy. Undiffusionable hydrogen occuping the tetragonal site is free from such a role.
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  • Mechanical properties of 5083 and 7N01 aluminum alloy pre-deformed by simple tension
    Shiro SATO, Noboru OKOSHI
    1977 Volume 27 Issue 10 Pages 480-487
    Published: October 30, 1977
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.27.480
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    Tensile and compressive tests were carried out about the tensile pre-worked plates of 5083-0 and 7N01-T6 alloys. The strain aging and the Bauschinger effect are discussed on the basis of stress-strain diagrams. Nearly the same stress-strain curves are recorded in the reloading test in which the specimens are held at room temperature for 20 minutes and for 1 month after preworking. The fact shows freedom from the strain aging. Slight softening is found on the 5083-0 alloy heavily preworked and aged for 1 month. The proportional limit of the plates lightly preworked is nearly equal to the preworked stress, but that of the plates heavily preworked gradually decreases with increase in the preworking strain. The compressive stress-strain diagram of the tensile preworked 5083-0 plates is higher than that of the base alloy, but that of the 7N01-T6 plates is lower. The ratio of the compressive proof stress to the tensile proof stress of the plates tensile preworked is from 0.9 to 0.8 independently of the degree of preworking.
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  • On the limit-temperature for G. P. zone formation in Al-Cu alloy
    Tatsuo SATO, Yo KOJIMA, Tsuneo TAKAHASHI
    1977 Volume 27 Issue 10 Pages 488-492
    Published: October 30, 1977
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.27.488
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    This work on the Al-1 to 4%Cu alloys was made mainly by means of electric resistivity and hardness measurements. All the alloys have a region in which electric resistivity is unchanged on the resistivity-aging time curves (flat-region). The electric resistivity in this region (flat-value, ρflat) depends on aging temperature. This can be explained as; ρflat = contribution of solute concentration, ρM + contribution of G.P. zone, ρG.P.. Alloys with various solute concentrations have peculiar constant flat-values above certain temperatures, which are considered to be the limit-temperature for G.P. zone formation (Tlimit)and are respectively 90°C for 1%Cu, 150°C for 2%Cu, 220°C for 3%Cu and 270°C for 4%Cu alloys.
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  • Aging of dilute Al-Zr alloys
    Seiichi NISHIKAWA, Kazuo NAGATA, Kiyoshi UMEZU, Shigeyoshi KOBAYASHI
    1977 Volume 27 Issue 10 Pages 493-502
    Published: October 30, 1977
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.27.493
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    An aging process and its close relationship with dislocations in dilute Al-Zr alloys containing Zr up to the maximum solid solubility 0.28wt% at 660.5°C were examined mainly by electrical resistivity measurement. The residual resistivity of Zr in aluminum, 7755.10-9Ω•cm/at%Zr, and the tempcrature dependency of solid solubility of Zr in aluminum, c = 472.exp (-16100/RT) in at% were given as fundamental data. Both isothermal aging and step-annealing were pursued on 99.991%Al, Al-0.04wt%Zr and Al-0.28wt%Zr alloys. The precipitation course is subdivided into two regions; the initial one is preferential precipitation on dislocations rate-controlled by dislocation short circuit with activation energy of 15-20kcal/mol at lower temperatures, and the later one is homogeneous precipitation rate-controlled by volume diffusion with activation energy of 4050kcal/mol at higher temperatures. The former process in especially enhanced by plastic deformation and is important as a starting point of overall precipitation reaction.
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  • The effect of aged structures on the fatigue behavior of Al-4%Cu alloy
    Hisashi SUZUKI, Motohiro KANNO, Motoji TSUBOTA, Koji HAYASHI
    1977 Volume 27 Issue 10 Pages 503-511
    Published: October 30, 1977
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.27.503
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    The fatigue behavior of the Al-4%Cu alloy having various aged structures was studied at room temperature. Different aged structures result in different shapes of S-N curves: the alloy containing G. P. zones (or θ") is superior in the fatigue strength in the region of lower fatigue life to that containing θ'. This relation tends to be inverse in the region of higher fatigue life. This is attributed to the difference in the mode of crack initiation and propagation between those alloys. A cyclic softening in stress response curves is found only in the alloy containing G. P. zones (or θ"). Hardening in Hv-N curves is accompanied in this case. Neither re-solution nor overaging is found in deformation bands formed in the alloys.
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  • The effects of segregation and precipitation on the annealing behaviour and grain size of aluminium alloys
    Furrer P., Warlimont H., Yotaro MURAKAMI
    1977 Volume 27 Issue 10 Pages 512-522
    Published: October 30, 1977
    Released on J-STAGE: July 23, 2008
    DOIhttps://doi.org/10.2464/jilm.27.512
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