2ppmNaを含むAl-5%Mg合金の高温延性に及ぼすひずみ速度の影響 Effect of strain rate on hot ductility in Al-5mass%Mg alloys containing 2ppm of sodium

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著者

    • 山田 浩之 YAMADA Hiroyuki
    • 大阪大学大学院基礎工学研究科機能創成専攻大学院 Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University
    • 堀川 敬太郎 HORIKAWA Keitaro
    • 大阪大学大学院基礎工学研究科機能創成専攻 Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University
    • 小林 秀敏 KOBAYASHI Hidetoshi
    • 大阪大学大学院基礎工学研究科機能創成専攻 Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University

抄録

An impact tensile test was performed by means of the split-Hopkinson bar method to clarify the influence of strain rate on high temperature embrittlement in Al–5%Mg alloys containing traces of sodium. When the specimen was tested at a strain rate of 500 s<sup>−1</sup>, the hot ductility of the Al–5%Mg–2 ppm Na alloy decreased with increasing testing temperature, and the recovery of the ductility above 400°C was not identified. As a result of the impact test, the temperature lowering the hot ductility shifted to higher temperature in comparison with the quasi static test. Intergranular fracture was observed around 300°C in both the quasi static test and the impact test. However, area fraction of the intergranular fracture decreased in the impact test around 300°C. Observation of intergranular fracture surfaces revealed that a number of intergranular dimples were observed at grain boundary after the quasi static test, while the ledge patterns were observed at grain boundary after the impact test. It was also clarified that the high temperature embrittlement was suppressed by 200 ppm of bismuth addition below 400°C even when the specimen was deformed at high strain rate of 500 s<sup>−1</sup>.

収録刊行物

  • 軽金属

    軽金属 57(1), 25-29, 2007-01-30

    The Japan Institute of Light Metals

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各種コード

  • NII論文ID(NAID)
    10018494987
  • 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
    8659575
  • 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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