|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation
||Centimeter to Nanometer Materials Characterization Informed Phase Field Modeling of Mechanical Failure in 6022/EK100 Linear Friction Stir Welds
||Donovan Nicholas Leonard, Kubra Karayagiz, Adam Powell, Brajendra Mishra, Qingli Ding, Piyush Upadhyay, Tim Skszek
|On-Site Speaker (Planned)
||Donovan Nicholas Leonard
Phase field modeling, of a linear friction stir weld (FSW) between 1.27mm 6022 Al and 1.5mm EK100 Mg sheet, was being used to understand the effects of corrosion on a joint’s lap shear strength. The mechanical deformation model predicted a 150 N/mm joint strength, higher than the measured joint strength at 110-120 N/mm. Model refinement and validation is being aided through advanced materials characterization that reported evolution of 2nd phase nanostructures (Mg<sub>2</sub>Si), intermetallic growth, elemental segregation and grain size refinement. Xray CT, EBSD, SANS, transmission Kikuchi diffraction (TKD) and STEM/EDS were also combined to determine changes in grain size and 2nd particle morphology. A complex mixing of metals within the FSW, leaving ribbons of ~100nm thick Al<sub>30</sub>Mg<sub>23</sub> and Al<sub>12</sub>Mg<sub>17</sub> layers were discovered through correlation of TKD/EDS with nanoindentation measurements.
This work was supported by the Vehicle Technologies Office, U.S. Department of Energy, Award DE-EE0008454.
||Characterization, Joining, Modeling and Simulation