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Mechanically derived short-range order and its impact on the multi-principal-element alloys
Jae Bok Seol1, Won-Seok Ko2, Seok Su Sohn3
1Department of Materials Engineering and Convergence Technology, Center for K-metal & Microscopy, Gyeongsang National University, Jinju, 52828, South Korea. jb.seol@gnu.ac.kr.
Nature Communications
|November 9, 2022
Summary
Mechanically derived short-range order (MSRO) in a high-entropy alloy forms at low temperatures due to tensile deformation. Loading rates control MSRO, offering new insights into strain-induced ordering.
Area of Science:
- Materials Science
- Metallurgy
- Solid-State Physics
Background:
- Chemical short-range order (CSRO) typically arises in disordered solid solutions through heat treatments.
- An alternative mechanism, mechanically derived short-range order (MSRO), is investigated in this study.
Purpose of the Study:
- To investigate the formation and characteristics of MSRO in a multi-principal-element alloy (Fe40Mn40Cr10Co10 at%).
- To understand the influence of tensile deformation at 77 K and varying loading rates on MSRO.
- To elucidate the role of MSRO in the mechanical behavior and microstructural evolution of the alloy.
Main Methods:
- Tensile deformation at 77 K with controlled quasistatic loading rates.
- Multi-length-scale characterization, including scanning and high-resolution transmission electron microscopy (HRTEM).
- Analysis of electron diffraction patterns and molecular dynamics simulations.
Main Results:
- MSRO was successfully induced by tensile deformation at 77 K, with its degree tunable by strain rates.
- MSRO formation had a minor impact on yield strength, mechanical twinning, and displacive phase transformation.
- Microstructural analysis revealed dislocations and stacking faults as key drivers of MSRO in low stacking-fault energy alloys.
Conclusions:
- MSRO can be mechanically induced and controlled in specific alloys at low temperatures.
- The study provides a new perspective on strain-induced ordering transitions driven by lattice defects.
- Findings contribute to understanding the complex interplay between mechanical deformation and atomic ordering in advanced materials.
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