軽金属
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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64 巻, 4 号
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研究論文
  • アルミニウム薄皮付きブレージングシートを用いたフラックスレスろう付法
    大橋 裕介, 後藤 章仁, 鈴木 義和, 柳川 裕
    原稿種別: 研究論文
    2014 年 64 巻 4 号 p. 137-141
    発行日: 2014/04/30
    公開日: 2014/05/30
    DOIhttps://doi.org/10.2464/jilm.64.137
    ジャーナル フリー
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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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  • 薄肉超小型試験片の単軸駆動式二軸引張試験方法の開発
    花房 泰浩, 瀧澤 英男, 桑原 利彦
    原稿種別: 研究論文
    2014 年 64 巻 4 号 p. 142-148
    発行日: 2014/04/30
    公開日: 2014/05/30
    DOIhttps://doi.org/10.2464/jilm.64.142
    ジャーナル フリー
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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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