Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 48, Issue 9
Displaying 1-8 of 8 articles from this issue
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REVIEW: Recent aluminum brazing technology and its applications
RESEARCH REPORT
  • Fatigue strength characteristics of A6061/SUS304 friction welded butt joints
    Yoshio OH-UE, Takeshi SAWAI, Koichi OGAWA, Hideaki NAKAYAMA
    1998 Volume 48 Issue 9 Pages 459-464
    Published: 1998
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.48.459
    JOURNAL FREE ACCESS
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    Friction welded butt joints have come into wider use because of their easiness to fabricate composed shafts such as steering shaft, rear axle shaft and so forth. However, the welding condition optimum to obtain high joint efficiency in terms of fatigue strength has not yet been established because of a scarcity of fatigue strength data. Accordingly, it is indispensable to accumulate fatigue strength data on a variety of joints fabricated under different friction welding conditions. In this study, the rotating bending fatigue behavior of butt joints of aluminum alloy A6061 and austenitic stainless steel SUS304 which were friction welded at three different upset pressures are discussed. The results indicate that the butt joints friction welded at the highest upset pressure give almost the same fatigue strength as that of the aluminum alloy specimen. But the distribution of the fatigue lives of this kind of joint is larger than that of the joint of similar aluminum alloy, presumably depending on the scatter of fatigue crack initiation life.
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  • Effect of Cu and Zn addition on electrochemical properties of Al–Si brazing filler
    Shuu KURODA, Ken TOHMA
    1998 Volume 48 Issue 9 Pages 465-470
    Published: 1998
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.48.465
    JOURNAL FREE ACCESS
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    Electrochemical measurements as well as immersion corrosion tests were carried out in order to investigate the effect of Cu and Zn content in the filler on localized corrosion characteristics and corrosion rate of the filler, and on pitting corrosion resistance of Al–Mn brazing sheet. Both Cu and Zn segregated at eutectic α–phase of filler after brazing. Selective dissolution of eutectic α-phase occurred not only in Al–Si alloy filler but also in Al–Si–Zn and Al–Si–Cu alloys after brazing. In Al–9%Si–2%Zn alloy fillers containing more than 0.1%Cu, both inner primary α and eutectic α–phase of filler dissolved and the outer primary α undissolved. Dissolution characteristics of filler were closely related to the pitting potential difference between the phases depending on solid solubility of Si, Cu and Zn. Brazing sheet clad with the Zn containing filler can be pitting corrosion resistant, because corrosion rate of filler was not so high and the filler was effective as sacrificial anode for the core.
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  • Specific precipitates in Al–Mg2Si alloys aged after deformation
    Kenji MATSUDA, Hiroshi GAMADA, Yasuhiro UETANI, Seichi RENGAKUJI, Fuji ...
    1998 Volume 48 Issue 9 Pages 471-475
    Published: 1998
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.48.471
    JOURNAL FREE ACCESS
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    Precipitation behavior in Al–Mg–Si alloy artificially aged after mechanical deformation, was investigated by high resolution transmission electron microscopy (HRTEM). Small particles ~ 1.0 nm in diameter were observed together with dislocation lines after short aging treatment. They were arranged along the dislocation like a string of beads. The precipitates which appeared after peak aging, were lath-shaped and their longitudinal orientations were parallel to the [001] of the Al-matrix. Cross sectional observation revealed that the transverse orientation of the precipitate was deviated 10 degrees from the [100] or [010] orientation of the Al-matrix. These specific precipitates were only observed in Al–Mg2Si specimen annealed after deformation, but not in the specimen simply annealed. With the aging time, the specific precipitates disappeared and β' phase particles became dominant.
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