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 4
Displaying 1-6 of 6 articles from this issue
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RESEARCH ARTICLE
  • Improvement of tensile properties of injection molded AZ91Dalloy by adding Carbon Black
    Seiichi Akazawa, Tadao Fukuta, Kiyotaka Obunai, Koichi Ozaki, Koji Mur ...
    Article type: RESEARCH ARTICLE
    2015 Volume 65 Issue 4 Pages 113-117
    Published: April 30, 2015
    Released on J-STAGE: May 30, 2015
    DOIhttps://doi.org/10.2464/jilm.65.113
    JOURNAL FREE ACCESS
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    The purpose of this study was to improve tensile properties by grain refinement technique for injection molding of magnesium alloy by using solid carbon materials. A solid carbon material of Carbon Black was attached to surface of AZ91D alloy chips by using ball-milling. AZ91D alloy chips and Carbon Black were mixed while heating and stirring in the cylinder of magnesium injection molding machine, then molten metal was injection molded to 2.5 mm thick flat plate. The mechanical characteristics of molded products were evaluated uniaxial tensile load. The tensile test result showed that the 0.2% of proof stress, tensile strength and fracture strain were improved by Carbon Black addition. Microstructure observation revealed that the grain size of molded products were progressively finer when Carbon Black addition was increased. These results suggested that the addition of appropriate amount of Carbon Black is effective to improve the tensile properties of AZ91D alloy.
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  • Effects of fixing carbon nanoparticle to AZ91D magnesium alloy chip surface on thixomold forming
    Yoshiaki Hashimoto, Makoto Hino, Yutaka Mitooka, Koji Murakami, Teruto ...
    Article type: RESEARCH ARTICLE
    2015 Volume 65 Issue 4 Pages 118-122
    Published: April 30, 2015
    Released on J-STAGE: May 30, 2015
    DOIhttps://doi.org/10.2464/jilm.65.118
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    Thixomolded magnesium products have been applied as an alternative for plastic moldings in body frames for electronic equipments. AZ91D magnesium alloy chips are ordinarily used for thixomolding process. The carbon nanoparticle was fixed in the magnesium chip surface in order to improve the castability of thixomolding process. The manufacture of magnesium–carbon alloy is not easy, because carbon does not have the wettability for magnesium. However, the magnesium alloy chips fixed carbon nanoparticles make it possible to produce the magnesium–carbon alloy by thixomolding process. Since the fluidity of the magnesium alloy chip with carbon nanoparticle was improved in comparison with the AZ91D magnesium alloy chip, thin thickness molding became possible. In addition, mechanical properties of the thixomolded magnesium alloy made of the magnesium alloy chips fixed carbon nanoparticle were also improved.
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  • Effect of hot forging condition on the microstructure formation process in a high strength 6061 aluminum alloy
    Manabu Nakai, Goroh Itoh
    Article type: RESEARCH ARTICLE
    2015 Volume 65 Issue 4 Pages 123-130
    Published: April 30, 2015
    Released on J-STAGE: May 30, 2015
    DOIhttps://doi.org/10.2464/jilm.65.123
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    Medium-strength 6061 aluminum alloy is a suitable material for general-purpose structural use because of a good corrosion resistance and a good toughness. The effect of hot forging conditions on the microstructure in a 6061 aluminum alloy has been closely investigated, and the mechanism for the microstructure formation has been discussed. Specimens of 6061 aluminum alloy ingots were hot-forged at various temperatures and strain rates, and then T6-tempered. Microstructures of as-forged samples as well as T6-tempered ones were characterized mainly with EBSD and TEM. Non-recrystallized structures were formed by hot forging at all the Zener Hollomon (Z) parameters from 1.1×106 s-1 to 1.4×1012 s-1, which consisted of grains surrounded by high and low angle grain boundaries. The microstructure became refined with increasing Z. This refinement was attributable to grain subdivision mechanism that occurred during hot forging. Because of finer microstructure prior of solution treatment and non-occurrence of recrystallization, the microstructure in samples of middle Z was finer than that of low Z. In samples of the low Z and the middle Z conditions, these microstructures were thermally stable and did not change, even after high temperature solution heat treatment. In contrast, in samples of the high Z condition, a small number of nuclei were considered to form in the deformation microstructure because of high density of dislocations, resulting in coarse recrystallized microstructure.
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  • Effects of low-temperature heat treatment on hardening for Al–Fe–Mn alloy foil
    Takashi Suzuki, Shigeki Nakanishi, Qi Cui
    Article type: RESEARCH ARTICLE
    2015 Volume 65 Issue 4 Pages 131-136
    Published: April 30, 2015
    Released on J-STAGE: May 30, 2015
    DOIhttps://doi.org/10.2464/jilm.65.131
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    Al–Fe–Mn alloy processed by cold rolling is hardened by low temperature annealing. This behavior has been known as low temperature anneal-hardening in copper industry. In this study, we investigated the change of material properties and microstructures during low temperature annealing on cold rolled Al–Fe–Mn alloy with over 80% reduction. Al–Fe alloy, without Mn, was not hardened by low temperature annealing. As the cold rolling reduction of the specimen was higher, the tensile strength and the 0.2% proof stress increased by annealing. In anneal-hardened Al–Fe–Mn alloy, no precipitation was founded from the TEM observation, and no peak could be found on the DSC curve. Although the grain structure of Al–Fe–Mn alloy was refined by cold rolling, the dislocation density inside grain was low. This anneal hardening is similar to Hardening by annealing reported on severe deformation processing of aluminum.
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