Size- and strain rate-dependence of nickel and Ni–Co micropillars with varying stacking fault energy

نویسندگان

چکیده

The effect of the specimen size on mechanical characteristics material, a phenomenon commonly referred to as “size effect”, becomes increasingly important at micron and sub-micron dimensions specimen. However, majority studies face-centered cubic (fcc) metals have focused pure elements, where deformation is accomplished by dislocation glide. In this work, single crystalline Ni – x at. % Co (with = 0, 30, 50) solid solution micropillars were studied testing transmission electron microscopy (TEM) elucidate role stacking fault energy in function Co-addition. situ strain rate jump (SRJ) microcompression allowed evaluation sensitivity activation volumes for all pillar sizes different rates, spanning over three orders magnitude. TEM analysis showed that an increase content up 50%, SFE decreased from ~85 ~28 mJ/m2. We observed exhibit consistent trends (n=~?0.7), independent composition yield criterion, similar between volume sizes: increases with grain size/pillar size.

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ژورنال

عنوان ژورنال: Materials Science and Engineering A-structural Materials Properties Microstructure and Processing

سال: 2021

ISSN: ['0921-5093', '1873-4936']

DOI: https://doi.org/10.1016/j.msea.2020.140266