Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 59, Issue 5
Displaying 1-8 of 8 articles from this issue
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RESEARCH REPORT
  • Effect of additional Si and Cu on strength and corrosion resistance of sacrificial anode fin stock for automotive heat exchangers
    Michihide Yoshino, Masakazu Edo, Shuu Kuroda, Masami Asano, Ken Tohma
    Article type: Research Report
    2009 Volume 59 Issue 5 Pages 229-235
    Published: May 30, 2009
    Released on J-STAGE: June 30, 2009
    DOIhttps://doi.org/10.2464/jilm.59.229
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    To investigate the effects of Si and Cu on strength and corrosion rate of sacrificial anode fin stock of Al–1.5%Mn–0.2%Fe–1.5%Zn alloy for automotive heat exchangers, tensile test and SWAAT have been carried out. Strength increased with Si and Cu addition. Corrosion rate did not increase with Si addition in spite of increase of α-AlMnSi compound density, because the compounds did not work as effective cathode in the alloy. On the other hand, corrosion rate increased with Cu addition. This was explained in the existence of deposited Cu on the specimen surface during SWAAT worked as strong cathode in the alloy. Cathodic polarization characteristics in 3.5% NaCl solution rather than in SWAAT solution were effective to evaluate corrosion rate of the alloys in SWAAT.
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  • Joining of different materials between 1050 aluminum plate and polypropylene resin by diode laser using insert materials
    Makoto Hino, Yutaka Mitooka, Koji Murakami, Kazuto Urakami, Jun Takada ...
    Article type: Research Report
    2009 Volume 59 Issue 5 Pages 236-240
    Published: May 30, 2009
    Released on J-STAGE: June 30, 2009
    DOIhttps://doi.org/10.2464/jilm.59.236
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    Laser joining for different materials between 1050 aluminum alloy plate of 1 mm thickness and polypropylene sheet of 2 mm thickness using a newly developed insert sheet was studied. The diode laser-irradiation to the polypropylene side was carried out in air. The effects of an anodizing onto the aluminum specimens on the joining properties were examined.
    It was not possible to join the 1050 aluminum plate to polyethylene sheet directly under the various laser-irradiation conditions. However, the use of insert sheet held between the aluminum plate and the polypropylene sheet made it possible to join the 1050 aluminum plate to polyethylene sheet by laser-irradiation. The joining strength increased with the increase in the input energy by laser-irradiation, and the anodizing for 1050 aluminum plate improved the joining strength. It was found that the chemical state of aluminum surface strongly affected the joining strength.
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  • Influence of high temperature holding on tensile strength of PAN-based carbon fiber reinforced aluminum–magnesium alloy composites fabricated by ultrasonic infiltration method
    Sho Yamaguchi, Jun Mikuni, Ikumi Mizoguchi, Tadashi Matsunaga, Kenji S ...
    Article type: Research Report
    2009 Volume 59 Issue 5 Pages 241-247
    Published: May 30, 2009
    Released on J-STAGE: June 30, 2009
    DOIhttps://doi.org/10.2464/jilm.59.241
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    Carbon fiber reinforced aluminum alloy composites (CF/Al composites) are expected to be applied to electric power cable due to superior specific strength and specific modulus. But it is reported that CF/Al composites form aluminum carbide (Al4C3) at the interface between carbon fiber and aluminum alloy. However, influence of operating temperature, in usual 300°C, on the growth of Al4C3 and tensile strength of CF/Al composites have not been clarified. In this study, at first, PAN-based CF (M40J) /Al composites are fabricated with ultrasonic infiltration method and hold at 300, 450, 500°C for 64 h. Secondary, influence of holding temperature on the quantity of Al4C3 was investigated. Thirdly, relationship between the quantity of Al4C3 and tensile strength of CF/Al composites was examined. As holding temperature increased, the quantity of Al4C3 increased and tensile strength decreased. By examining extracted fiber with SEM, it was found that tensile strength should be decreased because Al4C3 corroded carbon fiber. Kinetics calculation indicated that remaining strength of the CF/Al composites, held at 300°C for 36 years, was nought. As a result, it will be difficult to apply the CF/Al composites to electric power cable.
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  • Effects of pre-aging at elevated temperature and natural aging on the bake hardenability of Al–Mg–Si alloy
    Hidenori Hatta, Shinichi Matsuda, Hiroki Tanaka, Hideo Yoshida
    Article type: Research Report
    2009 Volume 59 Issue 5 Pages 248-253
    Published: May 30, 2009
    Released on J-STAGE: June 30, 2009
    DOIhttps://doi.org/10.2464/jilm.59.248
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    Effects of natural aging before pre-aging, pre-aging and natural aging after pre-aging on the bake hardenability of the Al–0.62mass%Mg–0.96mass%Si alloy have been studied by tension test, hardness measurement, electrical resistance measurement and differential scanning calorimetric analysis (DSC). The bake hardenability after natural aging at 20°C for 86.4 ks was improved by pre-aging between 100°C and 170°C. In the case of short pre-aging at 100°C, the bake hardenability started to decrease after natural aging for more than 86.4 ks, because the amount of clusters of solute atoms increased. Natural aging before pre-aging causes decreasing the bake hardenability because the clusters formed during natural aging before pre-aging.
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  • Effects of various pre-treatments and cold rolling on room temperature aging of 6000 series aluminum alloys
    Takahiko Nakamura, Kenji Muramatsu, Masanori Nagai, Ryouhei Otsu, Shin ...
    Article type: Research Report
    2009 Volume 59 Issue 5 Pages 254-260
    Published: May 30, 2009
    Released on J-STAGE: June 30, 2009
    DOIhttps://doi.org/10.2464/jilm.59.254
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    Three commercial age-hardenable alloys, 6022, 6063, 6N01, were cold rolled: CR at room temperature after the three different pre-treatments, which are solution treatment and iced water quenching: STQ, aging at room temperature for 864 ks after the STQ: RTA-1 and furnace cooling after holding at 623 K for 3.6 ks: O. These specimens were aged at room temperature for longer than 864 ks after the CR (RTA-2). Change in resistivity ρ at 77 K was traced from immediately after the CR to investigate work hardening and aging behavior at room temperature after CR. Vickers hardness HV was also measured 0.6 to 0.9 ks later from the STQ or CR. Increments in ρ and HV by the CR in the O state were smallest among the other pre-treatments. The CR in the STQ or RTA-1 state gave nearly same increments in ρ and HV. By the CR in the STQ state, aging rate of the RTA-2 was decreased with increasing true rolling strain. It is considered that this suppression of the RTA-2 may be attributed to “sweep out” of excess quenched-in vacancies by moving dislocations. This effect is expected to decrease the negative effect of room temperature aging on artificial age-hardening through decrease in amount of formed clusters by T3 treatments. In the final room temperature aging, RTA-2, after the RTA-1 and CR, initial aging rate was increased with true rolling strain. This observation suggests that vacancies were surely introduced by the CR. However, the acceleration of the RTA-2 was limited only short period till the excess vacancies annihilated to dislocations, which density was increased by the CR.
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  • Effect of thermal condition on blowing behavior and pore morphology of porous magnesium
    Makoto Kobashi, Kazuhito Maehara, Naoyuki Kanetake
    Article type: Research Report
    2009 Volume 59 Issue 5 Pages 261-264
    Published: May 30, 2009
    Released on J-STAGE: June 30, 2009
    DOIhttps://doi.org/10.2464/jilm.59.261
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    Porous magnesium was fabricated from a precursor made of AZ91 magnesium machined chips. The effect of thermal conditions (heating rate, heating temperature and cooling rate) of the precursor on foaming behavior and pore morphology was investigated. The precursor started to expand at around the solidus temperature of AZ91 magnesium alloy, and accelerated its expansion rate after the temperature exceeded the liquids line. The maximum expansion was sustained only for a few seconds, and the specimen shrunk rapidly by heating the specimen continuously. The degree of maximum expansion became higher and the pore size became smaller by increasing the heating rate from 1 K/s to 3 K/s. The porosity of porous magnesium increased by increasing the processing temperature up to 660°C, whereas the pore size became larger and inhomogeneous. The cooling rate also turned out to be an important factor to maintain high porosity. With the low cooling rate, pores tended to collapse and porosity became lower during the cooling period.
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