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首页> 外文会议>Internation Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures >Positron Annihilation Study of Vacancy-Type Defects in A1 Single Crystal Foils with the Tweed Structures Across the Surface
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Positron Annihilation Study of Vacancy-Type Defects in A1 Single Crystal Foils with the Tweed Structures Across the Surface

机译：正电子湮没研究A1单晶箔的空位型缺陷与表面跨越曲线结构

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摘要

The vacancy-type defects in the aluminum single crystal foils after a series of the cyclic tensions were studied using positron annihilation. Two components were identified in the positron lifetime spectra associated with the annihilation of free positrons and positrons trapped by dislocations. With increasing number of cycles the dislocation density firstly increases and reaches a maximum value at N = 10000 cycles but then it gradually decreases and at N = 70000 cycles falls down to the level typical for the virgin samples. The direct evidence on the formation of a two-phase system "defective near-surface layer/base A1 crystal" in aluminum foils at cyclic tension was obtained using a positron beam with the variable energy.
机译：使用正电子湮灭研究了一系列循环张力后，铝合金单晶箔中的空位型缺陷。在与剥离捕获的自由正的固体和正核的湮灭相关联的正电子寿命谱中鉴定了两个组分。随着越来越多的循环次数，位错密度首先增加并达到n = 10000个循环的最大值，然后逐渐减小，并且在n = 70000周期下降到原始样本的典型水平。使用具有可变能量的正电子束获得循环张力下的铝箔中形成两阶段“近视层/基础A1晶体”的直接证据。

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