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 3
Displaying 1-9 of 9 articles from this issue
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RESEARCH REPORT
  • Effect of additional Fe, Ni, and Mn on 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 3 Pages 101-107
    Published: March 30, 2009
    Released on J-STAGE: April 30, 2009
    DOIhttps://doi.org/10.2464/jilm.59.101
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    The effect of additional Fe, Ni, and Mn on corrosion rate of sacrificial anode fin stock for automotive heat exchangers has been investigated in terms of size, density and chemical composition of intermetallic compounds. Corrosion rate increased with Fe and Ni addition in Al–1.0Mn–1.5Zn alloy, because AlMnFe and AlNiFe compounds worked as effective cathode in the alloy. On the other hand, corrosion rate decreased with increasing of Mn content in Al–Mn–Fe–1.5Zn alloys in spite of increasing of compound density. This was because cathodic effect of AlMnFe compound decreased with decreasing of Fe/Mn ratio in the compound.
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  • Effect of additional Cu and Mg in Al–Mn–Si alloy on intergranular corrosion susceptibility after heating at 200°C
    Shohei Iwao, Masami Asano
    Article type: Research Report
    2009 Volume 59 Issue 3 Pages 108-113
    Published: March 30, 2009
    Released on J-STAGE: April 30, 2009
    DOIhttps://doi.org/10.2464/jilm.59.108
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    Effect of additional Cu and Mg in Al–Mn–Si alloy on intergranular corrosion susceptibility (corrosion characteristics) has been investigated by SWAAT after heating at 600°C, followed by reheating at 200°C. Intergranular corrosion occured in Al–Mn–Si–Cu alloy after the heating for 1 to 10 h, while pitting corrosion was observed in Al–Mn–Si–Cu–Mg alloy. Intergranular corrosion in the former alloy was cause by selective dissolution of lacking zone containing less content of Cu. In the latter alloy precipitates including Cu were observed not only in grain boundary but also in grain even after shorter heating time at 200°C. Therefore,decreasing intergranular corrosion susceptibility of the alloy was caused by smaller potential difference between lacking zone and grain matrix. In conclusion, addition of Mg in Al–Mn–Si–Cu alloy has corrosion resistance improving effect after heating at higher temperature.
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  • Effect of filling condition of alumina particle on dispersibility of particle by friction surfacing
    Dai Nakama, Kazuyoshi Katoh, Hiroshi Tokisue
    Article type: Research Report
    2009 Volume 59 Issue 3 Pages 114-120
    Published: March 30, 2009
    Released on J-STAGE: April 30, 2009
    DOIhttps://doi.org/10.2464/jilm.59.114
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    6061 aluminum pipe filled with alumina particle used for consumable rod and 5052 aluminum plate used for substrate, friction surfacing were done using a numerical controlled full automatic friction welding machine. Quantity of filling was changed by inner diameter with φ5, 7, 9, 10 mm. Effect of quantity of filling of alumina particle in a consumable rod on the dispersion characteristics of alumina particle in deposit were investigated. It was clearly observed that the circularly pattern appeared on the surface of deposit. Both length and thickness of deposit were decreased with increase of inner diameter, and the width of deposit became large. Surfacing efficiency showed 37–47%, and it was decreased with increasing of inner diameter. Alumina particle did not disperse in deposit uniformly, and it was distributed over the surface of deposit linearly. Alumina particle in deposit was become finer than before surfacing, and became small so as to reduce the inner diameter of rod. Hardness of the area that a lot of alumina particle was observed at the macro- and microstructures was higher than the other parts. Results of wear test by Ohogoshi-style wear tester showed good wear resistant in more than inner diameter at 9 mm.
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  • Uniaxial tension and compression behavior of AZ31 magnesium alloy rolled and extruded materials
    Motohiro Yoshimizu, Norio Kawasaki, Hiroaki Ohsawa
    Article type: Research Report
    2009 Volume 59 Issue 3 Pages 121-127
    Published: March 30, 2009
    Released on J-STAGE: April 30, 2009
    DOIhttps://doi.org/10.2464/jilm.59.121
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    Mg alloy as a practical use metal is superior in specific strength and specific stiffness, and also exhibits eminent performance in heat discharging, electromagnetic wave shielding and vibration and shock absorption. Therefore, it is used for the components of cars, aircrafts, precision machines etc. and its applications are broadened to various fields. Mg alloy AZ31 rolled sheet and extruded sheet were considered in this study. It was the experimental observation and investigation of the deformation behavior about the materials manufactured different methods by uniaxial tensile test and compression test under the temperature range including high temperature range. It was also aimed at revealing and investigating the differences of material properties derived from different manufactured methods. A Siebel-type compression test was performed, which can compensate the deviation from a simple compression condition caused by the friction between interfacial surfaces of tools and materials, in order to perform the test based on ideal simple compression condition. The properties of material received by both tests were compared and important findings were obtained for Mg alloy AZ31 sheet.
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  • Effects of natural aging and reversion treatments on artificial aging behavior of 6000 series aluminum alloys
    Takahiko Nakamura, Kazuto Morita, Masanori Nagai, Shin-ya Komatsu
    Article type: Research Report
    2009 Volume 59 Issue 3 Pages 128-133
    Published: March 30, 2009
    Released on J-STAGE: April 30, 2009
    DOIhttps://doi.org/10.2464/jilm.59.128
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    Three 6000 series commercial alloys (6061, 6022 and 6 N01) were aged at room temperature, reverted at temperatures above 473 K and finally aged at 448 K. The negative effect of room-temperature pre-aging on age-hardening at 448 K in 6061 and 6022 alloys was not varied by times of pre-aging longer than 10 days. In the 6061 alloy, reversion treatment at 573 K for 30 s resulted in a significant reduction in age hardening at 448 K. It is conjectured that rapid precipitation occurred during the reversion treatment because of the high degree of super saturation caused by its high solute content. Hardening by paint baking at 448 K for 1.2 ks of automotive body panels was largely improved by reversion treatments for 30 s at 523 K in 6061, at 523 K or 548 K in 6022 and at 548 K in 6N01. Concerning with maximum age-hardening at 448 K, improvement by reversion in the negative effect was the same temperature that improved paint bake response the most. The range of reversion temperatures at which the hardening was most improved tended to become narrower with increasing Mg and Si contents.
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  • Effect of solution treatment temperature on aging behavior of Cu added 6063 aluminum alloy
    Takahiko Nakamura, Shin-ichi Fujiyama, Masahiro Noguchi, Shin-ya Komat ...
    Article type: Research Report
    2009 Volume 59 Issue 3 Pages 134-139
    Published: March 30, 2009
    Released on J-STAGE: April 30, 2009
    DOIhttps://doi.org/10.2464/jilm.59.134
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    Effects of solution treatment temperature, TST, and Cu addition on aging behavior of 6063 alloy at 448 K and room temperature were investigated through changes in resistivity ρ and hardness HV. Calculated complete dissolution temperature of Mg and Si, TCD, was about 760 K for present alloys. Above 773 K, ρSTQ, the ρ immediately after the solution treatment and water quenching, increased slightly. Most of the increment could be explained by increase in equilibrium solute Fe concentration. Therefore, it is concluded that increase in quenched-in vacancy concentration with the TST will be small. Solution treatment at 748 K, below the TCD, lowered maximum hardening by the aging at 448 K, also maximum resistivity increment in initial stage of aging at 448 K and the ρ increment by aging at room temperature until 3Ms. Maximum age-hardening at 448 K slightly increased with TST above 773 K. However, hardening by 448 K-1.2 ks aging, simulating bake-hardening, showed small dependence on TST above 773 K. Resistivity increment by aging at room temperature for 3 Ms decreased largely by solution treatment at 748 K. Because elevation of the TST beyond 773 K gave only small effect on the resistivity increment by aging at room temperature, rate of cluster formation will be suppressed more largely by solute concentration than excess vacancy concentration.
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  • Interfacial morphology of magnetic pulse welded aluminum/aluminum and copper/copper lap joints
    Mitsuhiro Watanabe, Shinji Kumai
    Article type: Research Report
    2009 Volume 59 Issue 3 Pages 140-147
    Published: March 30, 2009
    Released on J-STAGE: April 30, 2009
    DOIhttps://doi.org/10.2464/jilm.59.140
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    In order to investigate interfacial morphology and their welding condition dependency, Al/Al and Cu/Cu lap joints were fabricated by magnetic pulse welding under various discharge energies. A part of flyer plate along the longitudinal direction of the coil bulged toward a parent plate and hit the parent plate. Two parallel seam-welded areas were formed along the side edges of coil, but the area between them was left un-welded. The welding interface exhibited characteristic wavy morphology, which was similar to that of explosive welding. Wavelength and amplitude of the interfacial wave were not uniform, but gradually changed through the interface. In addition, the maximum wavelength and amplitude increased with increasing discharge energy. Both macro- and microscopic features of interfacial morphology are considered to be due to the oblique collision behavior between the plates, in which traveling velocity, collision angle and collision pressure of the plates gradually change during the welding for a few microseconds.
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