|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Unravelling the Mechanisms of Irradiation Induced Phase Transformation in Nanocrystalline Gold
||James Nathaniel, Douglas Medlin, Khalid Hattar, Mitra Taheri
|On-Site Speaker (Planned)
Gold is a noble metal typically stable as a solid in a face-centered cubic (FCC) structure; however, under particular circumstances (such as under high pressure and in nanoparticles) anomalous allotropes have been produced. Recently, stabilized hexagonal close packed (HCP) structure has been identified by diffraction in irradiated nanocrystalline gold thin-films. Though this phenomenon has been documented, the mechanism(s) of transformation have yet to be identified. Using in situ ion irradiation, atomic-resolution transmission electron microscopy (TEM), and automated crystal orientation mapping (ACOM) techniques, in this work, we investigate the specimen geometry, crystallography, defect morphology, and irradiation parameters which lead to the irradiation induced FCC to HCP phase transformation. SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525.
||Phase Transformations, Thin Films and Interfaces, Characterization