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 6
Displaying 1-5 of 5 articles from this issue
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RESEARCH ARTICLE
  • Age-hardening behavior of Al–10%Si–0.3%Mg alloy with water quenching and direct quenching after solution treatment
    Seiji Saikawa, Ryuichi Morioka, Kenji Matsuda, Susumu Ikeno, Emi Yanag ...
    Article type: RESEARCH ARTICLE
    2015Volume 65Issue 6 Pages 218-223
    Published: June 30, 2015
    Released on J-STAGE: July 30, 2015
    DOIhttps://doi.org/10.2464/jilm.65.218
    JOURNAL FREE ACCESS
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    Age-hardening behavior of Al–10 mass%Si–0.3 mass%Mg alloys was investigated using Micro-Vickers hardness measurement and transmission electron microscopy (TEM). The alloys were cast by a permanent mold process, homogenized at 813 K for 36 ks, cold rolled up to 68%, solution treated at 813 K for 36 ks, and then finally artificially aged at 348–523 K after water-quenched (W.Q.) or direct-quenched into an oil-bath at 348–523 K for artificial aging (D.Q.). When the final aging temperature was lower than at 373 K, the hardness at peak aging was not different between W.Q. and D.Q. conditions. However, the final aging temperature was higher than 373 K, the hardness at peak aging for the D.Q. condition was lower that for the W.Q. condition. This is due to the difference of formation such as G.P. zones and/or clusters between W.Q. and D.Q. conditions over 373 K.
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  • Investigation of heat flow behavior on die-casting core pin with direct measurement of die surface temperature and heat flux
    Suguru Takeda, Shin Orii
    Article type: RESEARCH ARTICLE
    2015Volume 65Issue 6 Pages 224-228
    Published: June 30, 2015
    Released on J-STAGE: July 30, 2015
    DOIhttps://doi.org/10.2464/jilm.65.224
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    Thermal behavior between casting and core pin/die in high pressure aluminum die-casting was investigated with direct temperature measurement by calculating surface temperature and heat flux. It is proved that there are three heat transfer stages from casting to core pin and that furthermore three types of heat flux curves are there depending on casting volume and cooling conditions. Under sufficient cooling conditions with higher heat flux, the surface temperature of core-pin would not exceed solidus temperature and chilled structure appears on the surface of the casting. On the other hand, insufficient cooling conditions, no chilled structure could be observed but spheroidization of eutectic silicon particles with soldering defects on the surface could be expected.
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  • Effect of Si amount and pre-aging temperature for the cluster behavior in Al–Mg–Si alloys
    Yuya Sawa, Koji Ichitani, Akira Hibino
    Article type: RESEARCH ARTICLE
    2015Volume 65Issue 6 Pages 229-233
    Published: June 30, 2015
    Released on J-STAGE: July 30, 2015
    DOIhttps://doi.org/10.2464/jilm.65.229
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    The effects of Si amount and pre-aging on the cluster behavior and aging behavior in Al–Mg–Si alloys were investigated. In order to examine the each behavior of cluster (1) and cluster (2), the samples were subjected to pre-aging at 298 K and 363 K. As the results of investigation, it was suggested that the process of β″ formation divides into two different ways due to the presence of both cluster (1) and cluster (2). And the formation of β″ was restrained by natural aging in the high Si content alloy.
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  • Texture evolution in aluminum sheet subjected to friction roll surface processing and subsequent annealing
    Yoshimasa Takayama, Ryuichi Hamano, Takuya Arakawa, Kenta Nonaka, Hide ...
    Article type: RESEARCH ARTICLE
    2015Volume 65Issue 6 Pages 234-243
    Published: June 30, 2015
    Released on J-STAGE: July 30, 2015
    DOIhttps://doi.org/10.2464/jilm.65.234
    JOURNAL FREE ACCESS
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    Textural evolution in commercial purity aluminum sheet subjected to friction roll surface processing (FRSP) by six combinations of plane/direction and subsequent annealing has been investigated. The characteristic microstructure consisting of fine- and coarse-grained layers in order from the processed surface are formed in the FRSPed and annealed specimens. The shear texture component E {111}⟨110⟩ mainly evolves in the specimen subjected to FRSP and annealing, the fraction of which depends on FRSP plane and direction.
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