TEM in situ micropillar compression tests of ion irradiated oxide dispersion strengthened alloy

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• 作者：K.H. Yano^a ; ^{kaylayano@u.boisestate.edu} ; M.J. Swenson^a ; Y. Wu^a ; ^b ; J.P. Wharry^a ; ^c
• 关键词：Ion irradiation ; Oxide dispersion strengthened ; In situ ; Micropillars ; Microcompression ; Picoindenter ; Micro-mechanical testing ; TEM
• 刊名：Journal of Nuclear Materials
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：483
• 期：Complete
• 页码：107-120
• 全文大小：4531 K
• 卷排序：483

文摘

The growing role of charged particle irradiation in the evaluation of nuclear reactor candidate materials requires the development of novel methods to assess mechanical properties in near-surface irradiation damage layers just a few micrometers thick. In situ transmission electron microscopic (TEM) mechanical testing is one such promising method. In this work, microcompression pillars are fabricated from a Fe2+ ion irradiated bulk specimen of a model Fe-9%Cr oxide dispersion strengthened (ODS) alloy. Yield strengths measured directly from TEM in situ compression tests are within expected values, and are consistent with predictions based on the irradiated microstructure. Measured elastic modulus values, once adjusted for the amount of deformation and deflection in the base material, are also within the expected range. A pillar size effect is only observed in samples with minimum dimension ≤100 nm due to the low inter-obstacle spacing in the as received and irradiated material. TEM in situ micropillar compression tests hold great promise for quantitatively determining mechanical properties of shallow ion-irradiated layers.