軽金属
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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65 巻, 10 号
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研究論文
  • 5052アルミニウム合金細径丸棒を用いた摩擦圧接継手の組織と機械的性質
    浅野 裕紀, 野本 光輝, 前田 将克, 加藤 数良
    原稿種別: 研究論文
    2015 年 65 巻 10 号 p. 485-491
    発行日: 2015/10/30
    公開日: 2015/11/30
    DOIhttps://doi.org/10.2464/jilm.65.485
    ジャーナル フリー
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    5052-H34 aluminum alloy with 5 mm in diameter was friction welded using a conventional automatic friction welder. The effect of welding conditions on microstructures and mechanical properties of friction welded joints were investigated. Total loss of welded joints increases with increasing both the rotational speed and friction time. In addition, the total loss was negligibly low when the welding condition was N=6000 rpm and t1=1 s.Macrostructures of welded joints showed symmetrical structure with respect to the weld interface and the rotational axis. A layer with fine-grained microstructure was formed at the weld interface. The layer grew thicker by increasing both rotational speed and friction time. Heat affected zone was formed around the fine-grained layer. It tends to increase with increase of both the rotational speed and friction time. The softened area of the joints reached to about 8 mm from the weld interface. In addition, weld interface was cured under conditions of N=6000 rpm and t1=1 s.The highest tensile strength of thin diameter joints was 209 MPa, which was obtained under the condition of N=6000 rpm and t1=3 s. Its joint efficiency reaches 80% of the base metal.
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  • 7000系アルミニウム合金半連続鋳造鋳塊での凝固割れ
    坂口 信人
    原稿種別: 研究論文
    2015 年 65 巻 10 号 p. 492-497
    発行日: 2015/10/30
    公開日: 2015/11/30
    DOIhttps://doi.org/10.2464/jilm.65.492
    ジャーナル フリー
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    The initiation mechanism of hot tearing in direct chill casting ingot of 7000 series aluminum alloy was investigated. In 7000 series aluminum alloys, the temperature range between solidus (463°C) and 583°C was classified into brittle range on mechanical properties and deformation behaviors in semi solid state. The brittle range of 7000 series aluminum alloys was larger than that of other general aluminum alloys. In 7000 series aluminum alloy, the healing of the crack which initiated from shrinkage cavity was difficult to occur especially in the center of the direct chill casting ingot which was the last solidification part. Therefore, it was considered that the hot tearing in direct chill casting ingot of 7000 series aluminum alloys was easy to initiate the crack in the center of the ingot.
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  • 高速圧縮変形によるAl–Mg–Si合金の時効硬化性の改善
    堀川 敬太郎, 木谷 祐貴, 小椋 智, 廣瀬 明夫, 高橋 誠, 小林 秀敏
    原稿種別: 研究論文
    2015 年 65 巻 10 号 p. 498-502
    発行日: 2015/10/30
    公開日: 2015/11/30
    DOIhttps://doi.org/10.2464/jilm.65.498
    ジャーナル フリー
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    The age hardening of an Al–Mg–Si alloy was examined by the effect of high-speed (105 s−1) compression prior to aging. The enhancement of the age hardening is brought about by the formation of vacancy clusters during high-speed compression. High resolution transmission electron microscopy reveals that these vacancy clusters form stacking fault tetrahedra. Following peak aging, vacancy clusters and aging precipitates coexist in the grain interior. The high aging hardness obtained following high-speed compression is most probably due to the combined effects of vacancy and precipitation hardening.
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