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首页> 外文期刊>Journal of Materials Engineering and Performance >Effects of Dynamic Multi-directional Loading on the Microstructural Evolution and Thermal Stability of Pure Aluminum
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Effects of Dynamic Multi-directional Loading on the Microstructural Evolution and Thermal Stability of Pure Aluminum

机译：动态多方向载荷对纯铝组织演变和热稳定性的影响

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摘要

Microstructural evolution and thermal stability of 1050 commercial pure aluminum processed by means of split Hopkinson pressure bar and Instron-3369 mechanical testing machine to an accumulated strain of 3.6 were investigated. The nominal strain rates reached up to 3.0 x 10(3) and 1 x 10(-3)/s, respectively. Samples in the deformed state and annealed in the temperature interval 423-523 K for 1 h were characterized by transmission electron microscopy (TEM). TEM observations reveal that the initial coarse grains are refined significantly, and the deformed structures mainly consist of equiaxed subgrains and dislocation cells with a high density of interior dislocation. In addition, the average subgrain/cell sizes of these two kinds of deformed samples are nearly the same. As to recovery behavior, recovered subgrains are observed at 473 (dynamic) versus 523 K (quasi-static), that is to say, recovery is fairly slow in the quasi-static deformed samples. It is therefore to be expected that thermal stability of this dynamic deformed aluminum is weaker than that of the quasi-static compressed one, which is due to the higher density of dislocation and nonequilibrium dislocation configurations produced during dynamic loading.
机译：研究了采用分体式霍普金森压力棒和Instron-3369机械试验机加工的1050商用纯铝的显微组织演变和热稳定性，累积应变为3.6。标称应变率分别达到3.0 x 10（3）和1 x 10（-3）/ s。用透射电子显微镜（TEM）表征变形后的样品并在423-523 K的温度区间内退火1 h。透射电镜观察表明，初始粗晶粒明显细化，变形结构主要由等轴亚晶和位错单元组成，内部位错密​​度高。另外，这两种变形样品的平均亚晶粒/晶胞尺寸几乎相同。至于恢复行为，在473（动态）对523 K（准静态）下观察到了恢复的亚晶粒，也就是说，在准静态变形样品中恢复相当慢。因此，可以预期的是，这种动态变形的铝的热稳定性比准静态压缩的铝的热稳定性差，这是由于在动态加载过程中产生了更高的位错密度和非平衡位错构型。

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