|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||In Operando Nano- and Micro-mechanical Characterization of Materials with Special Emphasis on In Situ Techniques
||Suppression of Plastic Instability in Submicron FCC Crystals with Ultrahigh Strength
||Tao Hu, Lin Jiang, Hanry Yang, Kaka Ma, Troy D Topping, Amiya K Mukherjee, Enrique J Lavernia, Julie M Schoenung
|On-Site Speaker (Planned)
It is well known that micrometer-sized and/or submicrometer-sized metallic crystals exhibit “smaller is stronger” size effect. For some materials, near-theoretical strength values can be attained by reducing the dimensions of crystals to sub-micrometric or nanometric values. At these size scales, however, plastic instabilities, such as strain bursts, strain softening or low strain hardening rates, become operative due to the avalanche-like dislocation generation and escape; such instabilities contribute to disappointingly unstable plasticity. The onset of plastic instabilities has hindered fundamental study of the deformation behavior of materials near theoretical strength values. Moreover, they limit potential applications in microelectromechanical devices, for example. In this study we demonstrate that by concurrently introducing second phase particles and grain boundaries, strain bursts can be completely suppressed in submicron Al pillars and high strength and continuous plastic flow, as well as strain hardening can be simultaneously achieved.
||Planned: A print-only volume