過剰Si量の異なるAl-Mg_2Si合金の時効析出に及ぼす加工の影響 Effect of deformation on precipitation in Al-Mg_2Si alloys containing silicon in excess

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The aging behavior of 17 kinds of Al–Mg<sub>2</sub>Si alloys containing various amount of Si in excess deformed after solution heated were investigated by micro-Vickers hardness, electrical resistivity and transmission electron microscopy (TEM). In Al–0.4 mass%Mg<sub>2</sub>Si alloys containing various amounts of Si in excess, the aging after deformation causes increased maximum hardness (<i>H</i><sub>max</sub>) for all specimens. The age-hardenability (Δ<i>H</i>) of specimens increases by the deformation of 1% and becomes decreased by further deformation. The aging time to reach maximum hardness, <i>t</i><sub>max</sub>, becomes shortened by the deformation. The distribution and size of precipitates in the deformed specimens are denser and finer than those in specimens without any deformation. In Al–0.6 mass%Mg<sub>2</sub>Si alloys containing Si up to 0.1 mass% in excess, the aging after deformation causes increased <i>H</i><sub>max</sub> and Δ<i>H</i>. While, in Al–0.6 mass%Mg<sub>2</sub>Si alloys containing Si of 0.2 to 0.4 mass% in excess, the values of <i>H</i><sub>max</sub> remain constant with increasing amount of deformation and the values of Δ<i>H</i> decrease with increasing deformation over 5%. In Al–0.8 mass%Mg<sub>2</sub>Si and Al–1.0 mass%Mg<sub>2</sub>Si alloys containing Si in excess, the deformation prior to aging has no effect on <i>H</i><sub>max</sub>, Δ<i>H</i> and <i>t</i><sub>max</sub>. The precipitates are finer in the alloys which exibit increased Δ<i>H</i> by a small amount of deformation than those of the undeformed alloys. On the contrary, the precipitates are coarsened in the alloys with decreased Δ<i>H</i> by deformation. A small amount of deformation causes decreased values of Δ<i>H</i> at 473 K and increased Δ<i>H</i> at 523 K in the Al–0.6 mass%Mg<sub>2</sub>Si–0.4 mass%Si alloy. In the Al–0.4 mass%Mg<sub>2</sub>Si–0.4 mass%Si alloy, however, a small amount of deformation causes increased Δ<i>H</i> at 473 K and decreased Δ<i>H</i> at 423 K.

収録刊行物

  • 軽金属

    軽金属 47(7), 385-390, 1997-07-30

    The Japan Institute of Light Metals

参考文献:  7件中 1-7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)
    10003795698
  • 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
    4258125
  • 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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