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

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  • 山田 浩之
    大阪大学大学院基礎工学研究科機能創成専攻　大学院生
  • 堀川 敬太郎
    大阪大学大学院基礎工学研究科機能創成専攻
  • 小林 秀敏
    大阪大学大学院基礎工学研究科機能創成専攻

書誌事項

タイトル別名
  • Effect of strain rate on hot ductility in Al-5mass%Mg alloys containing 2 ppm of sodium
  • 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
  • 2ppmNa オ フクム Al 5パーセント Mg ゴウキン ノ コウオン エンセイ ニ オヨボス ヒズミ ソクド ノ エイキョウ

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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−1, 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−1.

収録刊行物

  • 軽金属

    軽金属 57 (1), 25-29, 2007

    一般社団法人 軽金属学会

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