Mg-Al合金における不連続析出セルの生成および成長 Nucleation and growth of discontinuous precipitation cells in Mg-Al alloys

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The discontinuous precipitation process of Mg–Al alloys during aging has been investigated by metallographic observation. In Mg–Al alloys, the initial stage of discontinuous precipitation cell formation had preferential precipitation and local instability of the grain boundary. With continued aging, the local migration of the original grain boundary rose into the adjacent grain. Consequently a solute depleted region was formed behind the advancing grain boundary. After a while, the preproposed S-mechanism required for the formation of double seam morphology appeared. The occurrence of both single seam and double seam morphologies were conformed at both aging temperatures lower and higher than <i>T</i><sub>m</sub>/2 (<i>T</i><sub>m</sub>: melting temperature). These facts do not coincide with Baumann's assumption that the highest dependence is on aging temperature. After the solution treatment, a Mg–9.5Al specimen was cold compressed by 3.2∼15.3%. The cold work prior to aging does introduce additional nucleation sites for general precipitation, with the age hardening somewhat accelerated. The fractional area of discontinuous precipitation cells was suppressed by the deformation twins, only onset of cell formation increased the rate.

収録刊行物

  • 軽金属  

    軽金属 49(1), 24-29, 1999-01-30 

    The Japan Institute of Light Metals

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各種コード

  • NII論文ID(NAID)
    10002665780
  • 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
    3087517
  • 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  NDL  J-STAGE 
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