Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 62, Issue 2
Displaying 1-6 of 6 articles from this issue
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RESEARCH REPORT
  • Effects of conversion coatings on adhesive properties of magnesium and aluminum alloys
    Manabu Takai, Yukihiro Sakamoto, Matsufumi Takaya
    Article type: Research Report
    2012 Volume 62 Issue 2 Pages 47-53
    Published: February 28, 2012
    Released on J-STAGE: March 30, 2012
    DOIhttps://doi.org/10.2464/jilm.62.47
    JOURNAL FREE ACCESS
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    Magnesium is a light metal with high specific strength and electromagnetic shielding properties. In recent years, it is required to adhere magnesium alloys with different metals. Bonding method is one of easy joint process between magnesium alloys and other materials. Contact corrosion of magnesium and different metals can be suppressed by using of adhesive. On the other hand, chromate conversion coating on magnesium was known as carcinogen and one of the methods to limit use of conversion coating. This paper describes the effects of conversion coatings on bond properties of magnesium and aluminum alloys. AZ31B magnesium alloy and A2017, A6022 aluminum alloys were used as specimens. Bond properties were evaluated by pull-off test, bond torque test and tensile lap-shear strength test. In addition, galvanic corrosion was evaluated by salt spray test. As a result of investigation on the bond strength of conversion coatings, the highest bond strength was obtained from the specimen of Mg(OH)2 coating on magnesium alloy and boehmite on aluminum alloy using epoxy resin for cure temperature of 373 K. The Mg(OH)2 coatingis expected as one of the alternatives of the chromate conversion coating.
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  • Texture evolution in AZ80 magnesium alloy by the plane strain compression deformation at high temperature
    Jinuk Kim, Kazuto Okayasu, Hiroshi Fukutomi
    Article type: Research Report
    2012 Volume 62 Issue 2 Pages 54-59
    Published: February 28, 2012
    Released on J-STAGE: March 30, 2012
    DOIhttps://doi.org/10.2464/jilm.62.54
    JOURNAL FREE ACCESS
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    The formation behavior of textures during high temperature plane strain compression deformation is experimentally studied on AZ80 magnesium alloy. Three kinds of specimens with different initial textures are prepared from the extruded bars having a ‹1010› fiber texture. Plane strain compression is conducted at 723 K, 5.0×10−2s−1 and strains ranging from −0.4 to −1.0. New grains appeared after the deformation up to −0.4 in true strain. Initial texture gradually changes with increasing strain. After the deformation up to −1.0 in true strain, (0001) ‹1010›, {1120} ‹1010›, (0001) ‹1120› and {1010} ‹0001› appeared depending on the initial texture. (0001) ‹1010› and {1120} ‹1010› are formed irrespective of the initial texture. Simple crystallographic examination showed that all the texture components are orientations stable for the plane strain compression.
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  • Effect of cold rolling reduction on development of recrystallization textures in an Al–Mg–Si alloy
    Hiroki Takeda, Akira Hibino, Ken Takata
    Article type: Research Report
    2012 Volume 62 Issue 2 Pages 60-66
    Published: February 28, 2012
    Released on J-STAGE: March 30, 2012
    DOIhttps://doi.org/10.2464/jilm.62.60
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    The effect of cold rolling reduction on development of recrystallization textures in an Al–Mg–Si alloy was investigated. Hot-rolled samples were cold-rolled to 0%(non-cold-rolled), 67%, 83%, and 92% reduction and then annealed at 533 K, 563 K, and 833 K. All annealings were performed at the same heating rate. The orientation density of Cube({001} ‹100›)texture after the annealing at 833 K decreased dramatically at over 67% cold rolling reduction. However, CubeND({001} ‹520›), R({123} ‹634›), and P({011} ‹111›)textures increased with decreasing orientation density of Cube. The phenomenon of particle stimulated nucleation(PSN)was clearly observed at 83% cold rolling reduction according to the investigation of the partially recrystallized microstructures. Moreover, recrystallized grains of Cu({112} ‹111›), CubeND, R , and P orientation were found around coarse second-phase particles. Therefore, the decrease in orientation density of Cube and the increase in orientation density of CubeND, R, and P were assumed to be mainly caused by PSN. In addition, this study suggested that development of recrystallized textures was affected by orientation rotation relationships between recrystallized grains and surrounding deformed matrix.
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  • Application of high-frequency induction heating apparatus to heat treatment of 6061 aluminum alloy
    Fang-ni Shang, Eiji Sekiya, Yoshihiro Nakayama
    Article type: Research Report
    2012 Volume 62 Issue 2 Pages 67-74
    Published: February 28, 2012
    Released on J-STAGE: March 30, 2012
    DOIhttps://doi.org/10.2464/jilm.62.67
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    A high-frequency induction heating apparatus was used for the heat treatment of a commercial 6061 aluminum alloy bar with the objective of improving the mechanical properties and productivity. Heating states of the 6061 alloy bar were examined in terms of temperature distribution, heating rate, overheating and temperature fluctuation; moreover, the mechanical properties of the alloy after heat treatment were also investigated. The results of this study are as follows. When the 6061 alloy bar was rapidly heated to the heat treatment temperature using the induction heating apparatus, temperature distribution and overheating of the sample were small as well as the temperature fluctuations in the holding process. A rapid heating rate of about 21°C/s heated the sample to the heat treatment temperature of 560°C in 26 s. The sample showed equivalent or superior mechanical properties compared with a sample heated by conventional electric furnace. Temperature and time of the heat treatment process greatly influenced the mechanical properties of the 6061 alloy, while there was no significant difference in mechanical properties of the sample heat-treated at various heating rates.
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