Title

TEM in Situ Micropillar Compression Tests of Ion Irradiated Oxide Dispersion Strengthened Alloy

Document Type

Article

Publication Date

1-2017

Abstract

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 situtransmission 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.

Comments

Erratum in: Journal of Nuclear Materials, 2017 July, 490, p. 344.

An error was discovered by the authors in Fig. 4c of the original article. The degree of rotation is incorrectly identified as ±45°. It should be ±1.5°. This value is correctly noted in the text of the original article. A modified Fig. 4 is provided for clarity. Readers should note that this error does not alter the results or conclusions of the original article. Rather, we provide this corrigendum to eliminate a potential point of confusion for any researcher attempting to replicate our focused ion beam milling procedures for compression pillars.

See diagram at doi: 10.1016/j.jnucmat.2017.04.054