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Mechanical properties of proton bombarded SS316L thin foils using the small punch technique
Journal of Nuclear Materials ( IF 3.1 ) Pub Date : 2020-06-24 , DOI: 10.1016/j.jnucmat.2020.152340
Y. Snir , D. Moreno , I. Silverman , S. Samuha , Y. Eisen , D. Eliezer , Y. Gelbstein , S. Haroush

The mechanical properties of thin foils (∼25 μm), to be used as a target’s window in a high intensity accelerator, require non-standard characterization techniques. In the current research, the innovative small punch test technique (SPT) had been used to map and determine the mechanical properties of SS 316L foil irradiated by high intensity of proton beams. The SPT results and the energy to fracture are presented and the fracture modes were determined by scanning electron microscopy (SEM) observations and electron backscatter diffraction (EBSD) analysis. The irradiated samples were exposed to 3.6 MeV proton bombardment at 250 μA and 290 μA, for 42 and 5 h, respectively. The major damage, as was reflected by significant ductility and energy to fracture losses, was associated with the irradiated zones which experienced the highest temperature and protons flux. Based on the observed evidence of deformation twins and dense dislocation bands, as well as the EBSD analysis, it was revealed that the limited deformation in the irradiated samples is related mainly to radiation damage and probably a minor effect of hydrogen embrittlement phenomenon. The limited ductility was explained by the accumulation of radiation damage that most probably hinder dislocations mobility through crystallographic glide. Nevertheless, these alternative deformation mechanisms involve nucleation and propagation of dislocation slip bands (DSBs) and intra-grain fragmentation. The DSBs intersections were proposed as the source for stress localization, which initiates crack formation which was followed by crack propagation through slip bands. This cracking mechanism was exhibited by a unique “saw tooth” fracture mode.



中文翻译:

质子轰击SS316L薄箔的机械性能

在高强度加速器中用作目标窗口的薄箔片(约25μm)的机械性能需要非标准的表征技术。在当前的研究中,创新的小冲头测试技术(SPT)已用于绘制和确定高强度质子束辐照的SS 316L箔的机械性能。给出了SPT结果和断裂能,并通过扫描电子显微镜(SEM)观察和电子背散射衍射(EBSD)分析确定了断裂模式。辐照的样品分别在250μA和290μA下分别经受3.6 MeV质子轰击42 h和5 h。重大的延展性,如可观的延展性和对断裂损失的能量所反映的那样,与经历最高温度和质子通量的辐照区有关。根据观察到的形变孪晶和致密位错带的证据,以及EBSD分析,发现受辐照样品的有限形变主要与辐射损伤有关,可能与氢脆现象的影响较小。有限的延展性是由辐射破坏的积累解释的,辐射积累最可能阻碍晶体滑移引起的位错迁移。但是,这些替代变形机制涉及位错滑移带(DSB)的形核和传播以及晶粒内破碎。提出了DSB交叉点作为应力局部化的来源,引发裂纹形成,随后裂纹通过滑带扩展。这种开裂机制表现为独特的“锯齿”断裂模式。

更新日期:2020-08-02
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