Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 65, Issue 1
Displaying 1-5 of 5 articles from this issue
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RESEARCH ARTICLE
  • Prevention of curling in orbital rotary flanging of 1050 and 5052 aluminum alloy tube-ends
    Kimiyoshi Kitazawa
    Article type: RESEARCH ARTICLE
    2015 Volume 65 Issue 1 Pages 2-6
    Published: January 30, 2015
    Released on J-STAGE: February 28, 2015
    DOIhttps://doi.org/10.2464/jilm.65.2
    JOURNAL FREE ACCESS
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    Two-pass orbital rotary flanging is performed and the value of critical contact area ratio Xc during orbital rotary flanging is experimentally determined. In the two-pass orbital rotary flanging, 1050 aluminum and 5052 aluminum alloy tube-ends are conical flared using a tool in the first pass and then subjected to orbital rotary flanging in the second pass. The experimental results indicate that the values of the tilt angle of the tool ω2 and the non-dimensional tool feed F significantly affect the prevention of curling and that the initial contact area ratio X0 is the principle factor in the prevention of curling; the curling is prevented by setting X0 below Xc. In addition, it is also experimentally found that Xc increases with increasing F for F<0.1; however, the rate of increase gradually decreases and Xc becomes constant (0.05) for F≥0.1.
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  • Surface texture and recrystallized microstructures in 1050 aluminum
    Atsushi Yamamoto, Masaaki Tsukamoto, Daisuke Okai
    Article type: RESEARCH ARTICLE
    2015 Volume 65 Issue 1 Pages 7-14
    Published: January 30, 2015
    Released on J-STAGE: February 28, 2015
    DOIhttps://doi.org/10.2464/jilm.65.7
    JOURNAL FREE ACCESS
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    Microstructures formed in specimens of 1050 aluminum cold-rolled at about 80% and 95% with large draughts and small draughts were observed using SEM-EBSD system. Cold-rolling was carried out using bright rolls without lubrication. Surface textures were formed near the surfaces of the specimens cold-rolled with large draughts up to about 80%. After annealing at 773 K, recrystallized grains having near 〈111〉//ND were formed. When the specimen was cold-rolled with large draughts up to about 95%, such recrystallized grains were not so frequently formed after annealing, although the surface textures had been formed. Whether the recrystallized microstructures having {111} plane orientations are formed or not would not be directly inquired about macroscopic deformation textures. There would be a desirable distribution of {111} oriented dislocation cells and others in deformation microstructures.
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  • Effect of the solidification structure on the hardness after T5 heat treatment in Al–10%Si–0.3%Mg alloy die-castings
    Emi Yanagihara, Shin Orii, Takuya Iketani, Seiji Saikawa, Kenji Matsud ...
    Article type: RESEARCH ARTICLE
    2015 Volume 65 Issue 1 Pages 15-21
    Published: January 30, 2015
    Released on J-STAGE: February 28, 2015
    DOIhttps://doi.org/10.2464/jilm.65.15
    JOURNAL FREE ACCESS
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    The solidification structure and hardness in Al–10%Si–0.3%Mg alloy cast by high-pressure die-casting and gravity die-casting were investigated used by optical microscopy, micro-vickers and ultra-micro hardness measurement. The shape of primary crystallized α-Al phases in high-pressure die-casting was cellular-dendritic and cellular, due to increasing of the number of heterogeneous nucleation and fragmentation of primary α-Al phase by flow into die-cavity. The macrostructure of cross section in die-casting consists of five layers; two primary crystallized phases nearby casting surfaces, two segregation bands and one final crystallized phase in center of casting wall. In the case of applying T5 treatment to die-casting, the hardness of primary α-Al phase was increased, but that of eutectic phase was approximately constant.
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