Transmission Electron Microscope In Situ Straining Technique to Directly Observe Defects and Interfaces During Deformation in Magnesium

摘要: In situ straining was used to study deformation behavior of hexagonal close-packed (hcp) metals. Twinning and dislocation motion, both essential plasticity in hcp materials, were observed. Typically, these processes are characterized postmortem by examining remnant microstructural features after has occurred. By imposing during imaging, direct observation active mechanisms is possible. This work focuses on structural metals a transmission electron microscope (TEM), recently developed technique that utilizes familiar procedures equipment increase ease experiments. TEM presents several advantages over conventional characterization, most notably time resolution streamlined identification mechanisms. Drawbacks the applicability other studies also addressed. twin boundary motion magnesium. A \( \left\{ {10\bar{1}2} \right\} \) observed tensile compressive loading. Twin-dislocation interactions directly Notably, dislocations remain mobile, even multiple with boundaries; this result suggests Basinki’s transformation mechanism twinning not present The coupling traditional characterization yields more detailed information about material than either alone.