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Influence of Combined Loading on Microstructure and Properties of Aluminum Alloy 2024-T3

机译：组合载荷对2024-T3铝合金组织和性能的影响

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The article gives results of the experimental study of mechanical properties and structure of the fractured specimens of multiphase aluminum-base alloy 2024-T3, which were deformed under the dynamic tension conditions. The study shows that the impact in an elastic region leads to an insignificant non-stationary deformation (i.e., deformation in the impact application process) and an insignificant weakening of the material, whereas in the presence of the appreciable plastic deformation before the impact the non-stationary deformation increases more than by an order of magnitude, and a marked weakening takes place. The effects observed are related to the synergy of structure under non-stationary loading. It was concluded that self-organization of the crystalline structure defects in the form of hydrodynamic flow channels, leading to increase in ductility and weakening, may occur only under the nonlinear (plastic) deformation conditions. In the elastic region, the synergic structure formation is limited only to a change of phase composition of the alloy, which may lead to premature fracture of the material under subsequent static deformation. This makes it impossible to predict durability of the material at a probability of uncontrollable load surges. Statistical examination of structure of the fractured specimens revealed the presence of the relaxation structure in the form of recrystallized grains of different sizes, characterized by the presence of scale invariance (scaling). As shown by the grain size analysis, the process of coarsening of the recrystallized grains under dynamic loading and fracture is controlled by some cooperative process related to the atomic and probably electronic structure of the deformed material.
机译：本文给出了在动态拉伸条件下变形的多相铝基合金2024-T3的断裂试样力学性能和组织的实验研究结果。研究表明，在弹性区域中的冲击会导致微不足道的非平稳变形（即，在冲击施加过程中变形）和材料的微弱削弱，而在存在明显的塑性变形的情况下，冲击会导致-静态变形增加的幅度超过一个数量级，并且显着减弱。观察到的效应与非稳态载荷下的结构协同作用有关。得出的结论是，只有在非线性（塑性）变形条件下，才会以流体动力流动通道的形式组织晶体结构缺陷，从而导致延展性增加和减弱。在弹性区域中，协同结构的形成仅限于合金的相组成的变化，这可能导致材料在随后的静态变形下过早断裂。这使得不可能以无法控制的负载突增来预测材料的耐久性。对断裂试样的结构进行统计检查发现，松弛结构以不同尺寸的重结晶晶粒形式存在，其特征是存在尺度不变性（结垢）。如粒度分析所示，在动态载荷和断裂条件下，再结晶晶粒的粗化过程是通过与变形材料的原子以及可能的电子结构有关的一些协作过程来控制的。

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