Mechanically derived short-range order and its impact on the multi- principal-element alloys

JB Seol and WS Ko and SS Sohn and MY Na and HJ Chang and YU Heo and JG Kim and H Sung and ZM Li and E Pereloma and HS Kim, NATURE COMMUNICATIONS, 13, 6766 (2022).

DOI: 10.1038/s41467-022-34470-8

Unlike diffusion-mediated chemical short-range orders (SROs) in multi- principal element alloys, diffusionless SROs and their impact on alloys have been elusive. Here, the authors show the formation of strain- induced SROs by crystalline lattice defects, upon external loading at 77 K. Chemical short-range order in disordered solid solutions often emerges with specific heat treatments. Unlike thermally activated ordering, mechanically derived short-range order (MSRO) in a multi- principal-element Fe40Mn40Cr10Co10 (at%) alloy originates from tensile deformation at 77 K, and its degree/extent can be tailored by adjusting the loading rates under quasistatic conditions. The mechanical response and multi-length-scale characterisation pointed to the minor contribution of MSRO formation to yield strength, mechanical twinning, and deformation-induced displacive transformation. Scanning and high- resolution transmission electron microscopy and the anlaysis of electron diffraction patterns revealed the microstructural features responsible for MSRO and the dependence of the ordering degree/extent on the applied strain rates. Here, we show that underpinned by molecular dynamics, MSRO in the alloys with low stacking-fault energies forms when loaded at 77 K, and these systems that offer different perspectives on the process of strain-induced ordering transition are driven by crystalline lattice defects (dislocations and stacking faults).

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