On Yielding Behavior of Aluminum-Magnesium Alloys under Dynamic Loading. (Behavior of Aluminum-Magnesium Alloys under Dynamic Loading, 1st Report)

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  • 衝撃荷重下におけるアルミニウム-マグネシウム合金多結晶体の降伏挙動について
  • 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 タケッショウタイ ノ コウフク キョドウ ニ ツイテ

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Abstract

The yielding behavior of aluminum-magnesium alloys (0.86, 2.05 and 4.75 Mg), which show a distinct lower yield point and a propagation of Lueders bands during yielding, was studied under dynamic loading at room temperature and compared to that under static test. The observed rise of the lower yield stress under dynamic test was interpreted as due to the rise of stress for unpinning the dislocations from their locking atmosphere and the rise of frictional stress due to small contribution of thermal fluctuation to unpinning and movement of dislocations, by using the equation suggested by A.H.Cottrell. Besides, the effect of magnesium content on the frictional stress was discussed by considering the degree of precipitating or clustering of solute atoms and dislocation cutting to produce point defects, and clustering or precipitating was identified as the effective factor. The multiple yielding, observed at static test for aluminum-magnesium alloys, did not take place under dynamic loading. The absence of the multiple yielding was interpreted as due to the lack of time for magnesium atoms to migrate to dislocations during deformation and to pin them down.

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