Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 50, Issue 6
Displaying 1-5 of 5 articles from this issue
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RESEARCH REPORT
  • Analysis of lubricant applying effect by shearing test of pure aluminum plates
    Toshiaki KANEEDA, Tatsuya NAKAMURA
    2000 Volume 50 Issue 6 Pages 266-271
    Published: 2000
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.50.266
    JOURNAL FREE ACCESS
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    Shearing test of pure aluminum plate has been conducted in order to ascertain lubricant applying effect mechanism proposed before. The specimen plate having the top protruding element with the thin slit was sheared under high normal loads. Boundary lubrication effects of applied material on the shearing force, namely the tangential force, and the sheared surface were determined. Analysis of the tangential force curves demonstrated that the tangential force was composed of three force components: shearing force, friction forces on the slit surface and the surface sheared. The results suggested that the applied materials lessened the friction forces between lamella structure or segment surfaces of the chip and facilitated the shear deformation under the high normal stress in lubricant applying effect cutting.
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  • Effect of dispersoids size on low temperature softening of work hardened Al–Mn–Mg aluminum alloys
    Takehiko ETO
    2000 Volume 50 Issue 6 Pages 272-275
    Published: 2000
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.50.272
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    Low temperature softening of work hardened Al–1 mass%Mn–1 mass%Mg alloys, containing small and large (Mn, Fe)Al6 dispersed particles (dispersoids) has been studied. Linear work hardening in an early stage of the stress-strain curves has been found to be due to the pile-up of dislocations around the particles and be proportional to the volume fraction of particles. The work hardened materials are easily softened by annealing at a low temperature mainly because of the climbing of Orowan loops around the particles. The softening rate of the specimens containing small patricles is faster than that containing large ones, with the activation energy of more or less 1.5 eV. Finally, the softening rate has been found to be inversely propotional to the forth power of the particle size. It has been suggested that the rate controlling process softening is dislocation pipe diffusion around the particles.
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  • Simplified determination of aluminum in aluminum dross
    Dai ISHIJIMA, Fumihiro URATANI, Shunsaku KOMODA, Kiyoshi YAMASAKI
    2000 Volume 50 Issue 6 Pages 276-280
    Published: 2000
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.50.276
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    The simplified determination method of aluminum in aluminum dross was developed and studied. This method applied the electromagnetic induction in conductors placed in the alternating magnetic field. This electromagnetic method allows any person to analyze samples in large amount in a short period of time. Even though there is some error compared to the conventional chemical methods, it is expected to be able to reduce the error by analysing many standard samples. The automatic measurement seems to become possible, if this method is used.
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  • Statistical analysis in tensile strength characteristics of friction welded joints of 1050, 2017, 6061 aluminum alloy to SUS304 stainless steel
    Ryoji TSUJINO, Katsuyoshi MORIKAWA, Yoshio OHUE, Hiroshi YAMAGUCHI, Ko ...
    2000 Volume 50 Issue 6 Pages 281-286
    Published: 2000
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.50.281
    JOURNAL FREE ACCESS
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    The tensile strength characteristics of friction welded joints of several aluminum alloys (A1050, A2017, A6061) to stainless steel (SUS304) were investigated by statistical analysis such as normal distribution and Weibull distribution. The results are as follows. The joint efficiencies of joints obtained under an optimum welding condition followed by a good joint showed near normal distribution with higher mean value and small dispertion, and furthermore showed a Weibull distribution with large shape parameter and small coefficient of variance. On the other hand, the joint efficiencies of joints obtained under the unsuitable welding condition followed by a poor joint showed a plus or minus distortional distribution with large dispertion and showed a Weibull distribution with small shape parameter and large coefficient of variance. Thus, the optimum welding condition could be obtained in the case of A1050 to SUS304 and A6061 to SUS304, but couldn't be obtained in the case of A2017 to SUS304 in this experiment.
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