Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 64, Issue 4
Displaying 1-5 of 5 articles from this issue
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RESEARCH ARTICLE
  • Flux-free brazing using brazing sheets with thin aluminum layer
    Yusuke Ohashi, Akihito Gotou, Yoshikazu Suzuki, Yutaka Yanagawa
    Article type: RESEARCH ARTICLE
    2014 Volume 64 Issue 4 Pages 137-141
    Published: April 30, 2014
    Released on J-STAGE: May 30, 2014
    DOIhttps://doi.org/10.2464/jilm.64.137
    JOURNAL FREE ACCESS
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    This paper describes a method of flux-flee brazing aluminum in an inert gas atmosphere using unique brazing sheets (EB sheets) with thin aluminum layers several micrometers thick on Al–Si–Mg filler metal. The effects of thin aluminum layers and the composition of filler metal of the EB sheets were investigated by joint clearance filling test. The EB sheets showed higher brazeability than that of conventional brazing sheets without the thin aluminum layers. The increase of magnesium content in filler metal improved brazeability. The addition of bismuth to filler metal also showed the positive effect. The behavior of the oxide film of brazing sheets during brazing was investigated by auger electron spectroscopy (AES) analysis. The oxide film of the conventional brazing sheets thickened during brazing heating. Contrarily, the oxide film of the EB sheets got thin at a temperature 848 to 863 K. The brazing mechanism of the EB sheets has been discussed based on this result.
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  • Development of uniaxially driven biaxial tensile testing method using microminiature specimen of thin thickness
    Yasuhiro Hanabusa, Hideo Takizawa, Toshihiko Kuwabara
    Article type: RESEARCH ARTICLE
    2014 Volume 64 Issue 4 Pages 142-148
    Published: April 30, 2014
    Released on J-STAGE: May 30, 2014
    DOIhttps://doi.org/10.2464/jilm.64.142
    JOURNAL FREE ACCESS
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    We have established a biaxial tensile test method suitable for the measurement of the local plastic deformation characteristics of a hard aluminum alloy sheet 3104-H, which is a typical material for aluminum can bodies, as a representative of the low work hardening materials. The present method consists of the following: (1) a microminiature cruciform specimen, (2) a newly designed linkage mechanism mounted on a uniaxial tensile testing machine, and (3) the loading path diagram as an experimental method to measure the biaxial stress–strain curves accurately from the biaxial tensile tests with linear displacement paths of the chucking jigs. The following are drawn from the biaxial tensile tests for the thin test material: (i) using the proposed biaxial tensile testing apparatus, we measured a contours of plastic work, and it was in good agreement with that measured using the conventional linear stress path tests, (ii) we were successful to determine the real yield points for various biaxial tensile states using the loading path diagrams and to measure the contour of plastic work corresponding to the maximum equivalent plastic strain of 0.0012, and (iii) the contour of plastic work is well approximated using the Yld2000-2d yield function with an exponent of 7.78.
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