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An overview for thermomechanical processing of Al-Li based alloy, Part Ⅱ

机译：Al-Li基合金的热机械加工概述，第二部分

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摘要

Electron microscopy analysis has been performed with the aim of understanding the difference in deformation mechanisms at 300℃, 400℃, and 500℃. Mechanical properties of alloys tested under different hot torsional deformation conditions are related to the nature of phases present and their interaction with dislocations. The summary of the TEM observation is presented in table 4. The presence of dynamically precipitated particles is obvious for all temperatures, with their number decreasing with increasing temperature and decreasing strain rate. This combination of conditions has two additional effects: a) during the initial strain there is reduced supersaturation and dislocation density and b) for a total strain of 4 increased atomic mobility and time to permit coarsening of particles formed at low strains.
机译：进行电子显微镜分析的目的是了解在300℃，400℃和500℃时变形机理的差异。在不同的热扭转变形条件下测试的合金的机械性能与存在的相的性质及其与位错的相互作用有关。 TEM观测结果的摘要显示在表4中。在所有温度下，动态沉淀颗粒的存在都是显而易见的，并且随着温度的升高和应变速率的降低，它们的数量也会减少。条件的这种组合具有两个附加作用：a）在初始应变期间，过饱和和位错密度降低，并且b）总应变为4时，原子迁移率和时间增加，从而允许在低应变下形成的颗粒变粗。

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