軽金属
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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65 巻, 2 号
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研究論文
  • 溶体化処理したAl–10%Si–0.3%Mg合金の二段時効挙動
    才川 清二, 森岡 竜一, 松田 健二, 池野 進, 柳原 恵美, 武田 秀
    原稿種別: 研究論文
    2015 年 65 巻 2 号 p. 55-60
    発行日: 2015/02/28
    公開日: 2015/03/31
    DOIhttps://doi.org/10.2464/jilm.65.55
    ジャーナル フリー
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    Two-step aging behavior of an Al–10%Si–0.3%Mg alloy cast into permanent mold, rolled up to 68% and solution-treated was investigated by micro-vickers hardness measurement and transmission electron microscopy (TEM). In the case that final-aging temperature is relatively lower and the holding time in iced water is longer, negative effect of two-step aging was observed because the peak hardness in the final-aging stage was slightly decreased. Similar tendency was obtained in the case that the pre-aging temperature is increased to room temperature. On the other hand, pre-aging at 423 K for a relatively long time slightly increased the peak hardness in the final-aging stage with a shorter time to reach the peak hardness. Such a two-step aging behavior is considered due to the influence of precipitated phases such as clusters, G.P. zones, parallelogram-type and β″ in the matrix.
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  • 高温プレス処理によるMg–9%Al–1%Zn合金板の室温延性向上
    三ツ石 圭佑, 北園 直樹, 鈴木 大志, 北薗 幸一
    原稿種別: 研究論文
    2015 年 65 巻 2 号 p. 61-65
    発行日: 2015/02/28
    公開日: 2015/03/31
    DOIhttps://doi.org/10.2464/jilm.65.61
    ジャーナル フリー
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    Mg–9%Al–1%Zn alloy is widely used as a casting or die casting material, however, its plastic formability is limited because of coarse eutectic intermetallic compounds and casting defects at grain boundaries. This study proposes a novel thermo-mechanical treatment (TMT) process for Mg–9%Al–1%Zn alloy using simple hot pressing technique. Cast Mg–9%Al–1%Zn alloy plates were uniaxially hot pressed up to 67% followed by isothermal holding at high temperature. The TMT processed Mg–9%Al–1%Zn alloys showed both high tensile strength over 350 MPa and high elongation over 20%. Microstructural observation revealed that the enhanced mechanical properties are due to reduction of intermetallic phases and casting defects. Present TMT process is easily applicable to many types of magnesium alloy sheets.
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