|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||Stochastic Character of Plastic Deformation in FIB-milled Copper Micropillars Investigated by the Acoustic Emission Technique
||Michal Knapek, Ádám István Hegyi, Péter Dusán Ispánovity, Kristián Máthis, František Chmelík, István Groma
|On-Site Speaker (Planned)
Plastic deformation of micron-scale crystalline materials differs considerably from bulk specimens, as it is characterized by random strain bursts. In this work, copper single-crystalline micropillars of various geometries were fabricated and tested. An improved focused ion beam fabrication method was proposed to get non-tapered micropillars with a maximum control over their shape. Compression tests with concurrent acoustic emission (AE) measurements were used to investigate the stochastic effects that appear in micron-scale plasticity, and to analyze statistical features of collective dislocation phenomena and associated strain bursts. Size effect in the plastic flow stress as well as clear correlations between the strain bursts and the AE events were found even at these small scales and were further statistically evaluated.
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