Application of the Positron Lifetime Spectroscopy as Method of Non-Destructive Testing

Application of the Positron Lifetime Spectroscopy as Method of Non-Destructive Testing
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DOI：
10.1051/jp4:1995114
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发表时间：
1995
期刊：
Journal De Physique Iv
影响因子：
--
通讯作者：
B. Somieski;R. Krause-Rehberg;H. Salz;N. Meyendorf
B. Somieski;R. Krause-Rehberg;H. Salz;N. Meyendorf
中科院分区：
其他
文献类型：
--
作者：
B. Somieski;R. Krause-Rehberg;H. Salz;N. Meyendorf

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为了证明正电子寿命谱（POLIS）作为无损检测（NDT）方法的适用性，对几种铁合金/钢进行了机械损伤（拉伸应力、疲劳、蠕变）。正电子湮没参数在各种损伤过程中有明显的变化。在拉伸应力以及蠕变后，在样品中检测到损伤的均匀分布。在疲劳实验的第一个弹性循环期间，在充分退火的材料中发生缺陷结构的变化。本文介绍了一种改进的野外测绘光谱仪
In order to show the suitability of the Positron Lifetime Spectroscopy (POLIS) as a method of Non-Destructive Testing (NDT) several iron alloys/steels were mechanically damaged (tensile stress, fatigue, creeping). The positron annihilation parameters show clear changes during all applied lids of damage. After tensile stress as well as after creeping a homogeneous distribution of damage in the sample was detected. During the very first elastic cycle of a fatigue experiment, a change in the defect structure occurs in well annealed materials. A modified spectrometer for in the field mapping is presented