Deformation Induced Microstructural Modification: Poster Session
Sponsored by: TMS Materials Processing and Manufacturing Division, TMS: Shaping and Forming Committee
Program Organizers: Arun Devaraj, Pacific Northwest National Laboratory; Suveen Mathaudhu, Colorado School of Mines; Kester Clarke, Los Alamos National Laboratory; Bharat Gwalani, North Carolina State Universtiy; Daniel Coughlin, United States Steel Corp
Monday 5:30 PM
March 15, 2021
Room: RM 38
Location: TMS2021 Virtual
Optimization of Continuous Casting Products and High Aluminium-Magnesium Alloys Utilization in Automotive Industry Applications: Gorkem Demir1; 1Asas Alüminyum Sanayi ve Ticaret A.S
Aluminum–magnesium alloys (5XXX series) which have many applications in the automotive sector, come to the fore and increase their usage areas decades owing to its high strength to weight ratio, weldability, and deep formability properties. 5XXX sheets, during mechanical deformation, dislocation movement is restricted by the replacement of Mg atoms with Al atoms in solid solution. Therefore, work hardening is delayed until high elongation values and the required shape can be easily formed into final product. Mg2Si phase ought to be substantially dissolved after the annealing process to avoid tearing and to ensure good formability. In the context of these evaluations, SEM - EBSD, investigated microstructure analysis and thermo-mechanical properties in detail. The conditions of continuous casting, which enable efficient production, have been determined and the thermo-mechanical processes required by the final products have been developed.
Synchrotron X-ray Probing Dynamic Structural Change of Materials under Shear Deformation by High-speed Rotational Diamond Anvil Cell: Tingkun Liu1; Bharat Gwalani1; Changyong Park2; Stas Sinogeikin3; Arun Devaraj1; 1Pacific Northwest National Laboratory; 2Argonne National Laboratory; 3DAC Tools, LLC
A newly designed high-speed rotational diamond anvil cell (HS-RDAC) was utilized to reveal dynamic microstructural evolution of metallic alloys by in-situ synchrotron X-ray diffraction (XRD) under applied translational and rotational shear force, simulating the severe shear deformation during solid phase processing (SPP). Pure Al and Al4Si alloy sheets were chosen to initially investigate the strain heterogeneity induced by HS-RDAC at low RPM, which found significant heterogeneity of accumulated plastic strain. Also, CuNb powders were processed by the HS-RDAC at 100 RPM to explore the dynamic structural change in an immiscible alloy system. The results showed that the Nb started to dissolve into Cu at 100 RPM by analyzing the evolution of lattice spacing and peak width. The results from in-situ X-Ray studies were correlated with ex-situ multimodal characterizations and computational modeling to enable new scientific understanding of the highly dynamic far-from-equilibrium microstructural transformation pathways during shear deformation based SPP.