衝撃荷重下におけるアルミニウム-マグネシウム合金の降伏強度，およびその温度依存性

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タイトル別名
  • The Yield Stress of Aluminum-Magnesium Alloys under Dynamic Loading and Its Temperature Dependence
  • ショウゲキ カジュウ カ ニ オケル アルミニウム-マグネシウム ゴウキン ノ コウフク キョウド , オヨビ ソノ オンド イソンセイ

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抄録

By performing the dynamic tensile test and the static test at −196°C to 130°C, the temperature and the strain rate dependences of the lower yield stress of aluminum-magnesium alloys (0.93, 1.82 and 3.67%Mg) were studied with special attention to its grain size dependence following the Cottrell-Petch equation, σy=σi+kyd−1⁄2. The experimental results are as follows; the yield stress in the dynamic test was larger than that in the static test and the temperature dependence of the yield stress in the dynamic test was considerable, while in the static test it was negligibly small. The temperature dependence in the dynamic test and the strain rate dependence were due to the facts that for the lowest magnesium alloy, ky, the locking term according to Cottrell, had the temperature and the strain rate dependences and that for the higher magnesium alloys, σi, the frictional stress, had mainly such dependences. The above results were discussed from the viewpoint of the rate theory for unpinning of locked dislocations and dislocation movement in the lattice with precipitates or solute clusters.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 28 (6), 325-329, 1964

    公益社団法人 日本金属学会

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