About this Abstract |
| Meeting |
TMS Specialty Congress 2026
|
| Symposium
|
4th World Congress on High Entropy Alloys (HEA 2026)
|
| Presentation Title |
Precipitation Introduced by Residual Stresses in a Complex Concentrated Alloy |
| Author(s) |
Bhargav Sudhalkar, Rakesh Barik, Namit Pai, René de Kloe, Srinivasan Srivilliputhur, Rajarshi Banerjee, Indradev Samajdar |
| On-Site Speaker (Planned) |
Indradev Samajdar |
| Abstract Scope |
A new room temperature microstructurally localized deformation-induced FCC to BCC phase transition has been observed in the Al0.3CoFeNi (9 at%. Al) high entropy alloy (HEA) or complex concentrated alloy (CCA). This transformation appears to be driven by local compositional fluctuations within the matrix of the FCC + ordered B2 two-phase microstructure when subjected to tensile strains. Room temperature tensile deformation introduced elastic-plastic strain gradients, or residual stresses in the two-phase microstructure. Multi-scale diffraction-based microstructural characterization, along with dynamical simulations of corresponding Kikuchi patterns, clearly revealed evidence of growth of sub-critical nuclei of a new BCC phase in the parent FCC + ordered B2 two-phase matrix. While both the ordered B2 and second BCC phases were enriched in Al, the new deformation induced BCC phase was substantially leaner as compared to the prior B2 precipitates. This was further ratified by analytical transmission electron microscopy (TEM) and focused molecular dynamics (MD) simulations. |
| Proceedings Inclusion? |
Undecided |