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首页> 外文期刊>Scripta materialia >X-RAY DIFFRACTION ANALYSIS OF PURE ALUMINUM IN THE CYCLIC EQUAL CHANNEL ANGULAR PRESSING
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X-RAY DIFFRACTION ANALYSIS OF PURE ALUMINUM IN THE CYCLIC EQUAL CHANNEL ANGULAR PRESSING

机译：循环等通道角压力下纯铝的X射线衍射分析

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摘要

XRD analysis was performed on Al samples cyclic pressed through ECAP using route A. Some conclusions drawn from the monitoring of dislocation density, r.m.s microstrain and effective domain size are as follows.1. Repetitive ECA pressings distort the symmetric profile of XRD peaks and to broaden the peak width, which is more obvious in the till) than the (200) plane.2. The dislocation density increases substantially up to only 4 passes and then reaches a constant value even after 16 passes. The r.m.s microstrain showed the same behavior as the dislocation density except a small decrease was found at 4 and 8 passes.3. The effective domain size significantly decreased at earlier stage of pressings (4 passes) and then showed little change as the number of pressings increased.4. It is believed that in the route A, 4 passes are critical number of repetitive pressings to make fine subgrain size and further pressings may result in stable equiaxed subgrain by increasing the misfit angle.
机译：X射线衍射分析是通过路线A对通过ECAP循环压制的Al样品进行的。从位错密度，r.m.s微应变和有效畴尺寸的监测得出以下结论：1。重复的ECA压制会扭曲XRD峰的对称轮廓并扩大峰宽，在（Till）中比（200）平面更明显。2。位错密度基本上增加到仅4次通过，然后甚至在16次通过之后也达到恒定值。 r.m.s微应变表现出与位错密度相同的行为，除了在第4和第8遍发现小幅下降外。3。有效区域尺寸在压制的早期阶段（4遍）显着减小，然后随着压制次数的增加几乎没有变化。4。可以认为，在路线A中，进行4次压制是重复压制的关键次数，以形成精细的亚晶粒尺寸，并且进一步的压制可能会通过增加失配角而导致稳定的等轴亚晶粒。

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