|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals and Materials 2021
||S/TEM Characterization of Interdendritic Phases in Ni-30Cr Weld Metal 52XL
||Cheng-Han Li, Carolin Fink, John Lippold, Joerg Jinschek
|On-Site Speaker (Planned)
Ta-rich γ/MC eutectic is the predominant interdendritic constituent that forms upon solidification in Ni-30Cr weld metal with Ta and Mo additions. In addition, a very small amount of topologically close packed phase forms on weld solidification. These terminal solidification constituents were investigated in detail by a combination of various methods in transmission electron microscopy (TEM): selected area electron diffraction (SAED) analysis and associated SAED pattern simulation, high angle annular dark field (HAADF) STEM imaging and associated image simulation, as well as energy-dispersive X-ray spectroscopy (STEM-EDS). Ta-rich γ/MC and tetragonal sigma (σ) phase were observed based on acquisition, analysis and simulation of six SAED patterns by specimen tilt into six defined zone axis orientations to differentiate sigma (σ) phase from Laves phase. The presence of sigma (σ) phase was further validated and its atomic configuration was revealed by high-resolution HAADF-STEM imaging in combination with HAADF-STEM image simulation experiments.
||Characterization, Nuclear Materials,