|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Mechanical Behavior of Nanostructured Materials
||L-151: Synthesis of Bulk Single-crystalline Quasicrystal Approximant YCd6 and Its Small-scale Mechanical Properties
||Gyuho Song, Tai Kong, Paul Canfield, Seok-Woo Lee
|On-Site Speaker (Planned)
Novel complex intermetallic compounds possess unique chemical, physical, electronic, and magnetic properties but their extreme brittleness at room temperature significantly limits their practical applications. However, the recent small-scale mechanics revealed that a brittle material could become ductile via size reduction. Here, we investigated the mechanical properties of Y-Cd quasicrystals and their approximants. A single crystal of YCd<SUB>6</SUB> quasicrystal and its approximant were synthesized by a solution growth in the binary Y-Cd melt, and conducted <I>in-situ</I> micropillar compression test. We found the preferential slip system in YCd<SUB>6</SUB> quasicrystal approximant, which can be explained by the translational symmetry and large interplanar spacings, and the size-dependence of yield strength, which would be related to the weakest link statistics. Furthermore, transmission electron microscopy was used to visualize the intrinsic defect structure. The fundamental mechanisms of unusual plastic deformation will be discussed in terms of two possible viewpoints: dislocation slip vs. rigid translational slip.
||Planned: Supplemental Proceedings volume