This paper is intended to examine the dislocation and adiabatic shear mechanisms of 7055 aluminum alloy during cutting process with different cutting speeds. The result indicates that, at low cutting speeds, isometric dislocation cells appear, the dislocation cells are interconnected into dislocation cell blocks, and the dislocation movement is controlled by thermal activation; at high cutting speeds, dislocations mostly come in the form of elongated or not fully closed dislocation cells, and the dislocation movement is controlled by phonon drag; the width of an adiabatic shear band increases with the cutting speed, and low cutting speeds are more likely to result in microcracks. The precipitation-free zones on the grain boundary display a discontinuity under all cutting speeds; distribution and grain size of the precipitates also vary significantly.

中文翻译：

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7055铝合金切削过程中的位错损伤及绝热剪切机制

本文旨在研究7055铝合金在不同切削速度下切削过程中的位错和绝热剪切机制。结果表明，在低切削速度下，出现等距位错单元，位错单元相互连接成位错单元块，位错运动受热活化控制；在高切削速度下，位错多以拉长或不完全闭合的位错胞形式出现，位错运动受声子拖曳控制；绝热剪切带的宽度随着切削速度的增加而增加，低切削速度更容易产生微裂纹。晶界上的无沉淀区在所有切削速度下都显示出不连续性；