|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||In Situ Interrogation of Dynamic Microstructural Evolution during Friction Stir Processing of Al – 4 at.% Si
||Julian Escobar, Arun Bhattacharjee, Jorge F dos Santos, Jan Herrnring, Luciano Bergmann, Peter Staron, Benjamin Klusemann, Bharat Gwalani, Suveen Mathaudhu, Cynthia Powell, Arun Devaraj
|On-Site Speaker (Planned)
Time-resolved analysis of microstructural evolution mechanisms during the Friction Stir Processing (FSP) can be achieved via synchrotron high energy X-ray diffraction (HEXRD). In this work, a customized portable FSP machine (Flexistir), was installed in the P07 Beamline at DESY Synchrotron, to study the microstructural evolution of an Al-4 at % Si alloy in situ during FSP. Tool rotational speeds of 350, 700 and 1400 revolutions per minute and welding speeds of 3, 6, 9, 12, 24 and 36 mm/s under a fixed axial force (2 kN) were studied. In situ results revealed process parameter dependent changes in lattice parameter and lattice strain of both Al and Si phases which was then correlated with detailed ex situ characterization results after FSP. The combination of in situ and ex situ study provided unprecedented insights to the microstructural evolution of this model alloy during FSP.
||Joining, Surface Modification and Coatings, Phase Transformations