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).
Bibliographical noteFunding Information:
J.B.S. acknowledges financial support from the National Research Foundation of Korea (NRF) grant funded by the Korea government (NRF−2021R1A2C4002622), funded by the Korea government (MSIT) (NRF−2022R1A5A1030054), and by Technology Innovation Program (Alchemist Project, 1415180672, Al-based supercritical materials discovery) funded by the Ministry of Trade, Industry & Energy, Korea. W.S.K. is financially supported by the Future Material Discovery Program of the Korea (No. 2019M3D1A1079214). S.S.S. is supported by the National Research Foundation of Korea (NRF−2020R1C1C1003554) and by the Korea Institute for Advancement of Technology (KIAT) grant funded by the Korean Government (MOTIE, P0002019, The Competency Development Program for Industry Specialist). M.Y.N., and H.J.C. are supported by the Ministry of Trade, Industry, and Energy (MOTIE) of Korea through the project No. N0002598 supervised by the Korea Institute for Advancement of Technology (KIAT). Z.L. acknowledges financial support from the Natural Science Foundation of Hunan Province in China (Grant No. 2021JJ10056). H.S.K. acknowledges financial support from the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF−2022R1A5A1030054).
© 2022, The Author(s).
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Biochemistry, Genetics and Molecular Biology(all)