アルミニウム中のMgの523K以下での平衡固溶度 Equilibrium solid solubility of Mg in aluminum below 523 K

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By annealing at 423 K for more than 10 Ms, the resistivity at 77 K, ρ<sub>77</sub>, in 92% cold rolled Al-3.18 at%Mg alloy decreased beyond a calculated value based on 2.5 at%Mg, the previously reported equilibrium solubility. Therefore, it is obvious that this 60 years old solubility data was overestimated. Aluminum alloys containing 3.18 to 8.91 at%Mg were isothermally annealed at temperatures of 423 to 523 K for longer than 864 ks with measuring ρ<sub>77</sub>. Through plotting the resistivity values versus annealing time <i>t</i> to the power of – 1/3 and extrapolating to the <i>t</i><sup>−1/3</sup>=0, the resistivity after infinite period annealing, ρ<sub>77</sub><sup>∞</sup>, in equilibrium state was estimated. Because the ρ<sub>77</sub><sup>∞</sup> increased with Mg content, the ρ<sub>77</sub><sup>∞</sup> values were plotted versus total Mg content and were regressed linearly. Equilibrium solid solubility at each temperature was estimated on the plots as intersections of the regression lines and the formerly determined relation between solute Mg concentration and ρ<sub>77</sub>. The obtained equilibrium solid solubility of Mg below 473 K is lesser than the previous values. Temperature dependence of the solubility is expressed as ln(<i>X</i>⁄0.385)⁄1−2<i>X</i>=1.948−2230⁄<i>T</i>, where <i>X</i> is atomic fraction of equilibrium solute Mg concentration. The equilibrium solubilities obtained from the above equation are 0.73 at% at 373 K, 1.54 at% at 423 K, 2.83 at% at 473 K and 4.73 at% at 523 K.

収録刊行物

  • 軽金属

    軽金属 52(5), 210-215, 2002-05-30

    The Japan Institute of Light Metals

参考文献:  17件中 1-17件 を表示

被引用文献:  2件中 1-2件 を表示

各種コード

  • NII論文ID(NAID)
    10008559303
  • NII書誌ID(NCID)
    AN00069773
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    04515994
  • NDL 記事登録ID
    6170326
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-284
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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