アルミニウム-リチウム合金に現われる引張り加工歪み模様と降伏点現象について

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  • On the Stretcher-Strain Markings and Yield Phenomena in Al-Li Alloy
  • アルミニウム-リチウム ゴウキン ニ アラワレル ヒッパリ カコウ ヒズミ モヨウ ト コウフクテン ゲンショウ ニ ツイテ

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Experiments were carried out to study the stretcher-strain markings and yield phenomena in aluminium-lithium (1.0∼3.0%) binary alloy.<BR>Two different types of yield phenomena in Al-3%Li alloy were observed in the precipitated state of second phase and in the aged state after solution heat-treatment.<BR>The former was observed in the non-recrystallized sheet with stretcher-strain markings when it was annealed at 300°∼375°C after having had intermediate heat-treatment at 340°C. Then, the yield phenomenon became more pronounced with the reduction of cold working but it had no connection with anisotropy in the annealed sheet.<BR>The yield phenomenon which was observed in the latter in the state of being aged at 110°∼190°C after having had solution heat-treatment at 520°C was small and free from stretcher-strain markings, and it was more similar to that of Al-Mg alloy than the former because it could be eliminated by the 3% skin pass or by the control of grain size to above 0.055 mm.<BR>Regarding to the mechanism of the yield phenomenon in the former, it might be due to the contribution of small and stable precipitates to resist the movement of dislocations, while in the latter, this phenomenon might be due to the dislocation pinning casused by the segregation of lithium atoms in aluminium matrix or the atmosphere locking.

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