|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Mechanical Behavior of Nanostructured Materials
||L-146: Mechanical Behavior of Sub-micron-sized Nanocrystalline Pillars under Monotonic and Cyclic Loading
||Jung-A Lee, Brandon B. Seo, Moo-Young Seok, Yakai Zhao, Upadrasta Ramamurty, Ting Y. Tsui, Jae-il Jang
|On-Site Speaker (Planned)
Size effect on deformation behavior of sub-micron-sized nanocrystalline pillars was systematically explored by applying monotonic and cyclic compressive stress. Pillars were prepared by e-beam lithography and electroplating which can produce several hundreds of uniform pillars simultaneously. Then, micro-compression tests were performed under various conditions. This presentation will cover two topics. First, the size effects on the rate-sensitive deformation were statistically investigated under three different strain rates. The obtained results revealed that smaller pillars show more pronounced rate-sensitive deformation, which is explained by Weibull modulus, strain-rate sensitivity, and activation volume. Second, the influences of cyclic loading on yielding behavior and plastic flow were examined by low-amplitude cyclic compression followed by compression tests. It was observed that yield strength and flow stress were non-negligibly influenced by cyclic stress even in elastic regime. This phenomenon was analyzed in terms of various parameters including number of cycles and pillar size.
||Planned: Supplemental Proceedings volume