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

Jae Bok Seol (), Won-Seok Ko, Seok Su Sohn, Min Young Na, Hye Jung Chang, Yoon-Uk Heo, Jung Gi Kim, Hyokyung Sung, Zhiming Li, Elena Pereloma and Hyoung Seop Kim ()
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Jae Bok Seol: Gyeongsang National University
Won-Seok Ko: Inha University
Seok Su Sohn: Korea University
Min Young Na: Korea Institute of Science and Technology
Hye Jung Chang: Korea Institute of Science and Technology
Yoon-Uk Heo: Pohang University of Science and Technology
Jung Gi Kim: Gyeongsang National University
Hyokyung Sung: Kookmin University
Zhiming Li: Central South University
Elena Pereloma: University of Wollongong
Hyoung Seop Kim: Pohang University of Science and Technology

Nature Communications, 2022, vol. 13, issue 1, 1-13

Abstract: Abstract 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).

Date: 2022
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DOI: 10.1038/s41467-022-34470-8

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