Microstructure and Mechanical Properties Evolution in HfNbTaTiZr Refractory High‐Entropy Alloy During Cold Rolling

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  • Sergey Zherebtsov
    Laboratory of Bulk Nanostructured Materials Belgorod National Research University Belgorod 308015 Russia
  • Nikita Yurchenko
    Laboratory of Bulk Nanostructured Materials Belgorod National Research University Belgorod 308015 Russia
  • Dmitry Shaysultanov
    Laboratory of Bulk Nanostructured Materials Belgorod National Research University Belgorod 308015 Russia
  • Mikhail Tikhonovsky
    National Science Center “Kharkov Institute of Physics and Technology” NAS of Ukraine Kharkov 61108 Ukraine
  • Gennady Salishchev
    Laboratory of Bulk Nanostructured Materials Belgorod National Research University Belgorod 308015 Russia
  • Nikita Stepanov
    Laboratory of Bulk Nanostructured Materials Belgorod National Research University Belgorod 308015 Russia

書誌事項

公開日
2020-04-28
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/adem.202000105
公開者
Wiley

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説明

<jats:sec><jats:label/><jats:p>The effect of cold rolling on the structure and mechanical properties of the HfNbTaTiZr refractory high‐entropy alloy with a single body‐centered cubic (BCC) phase structure is studied. The microhardness evolution during cold rolling to the thickness strain <jats:italic>ε</jats:italic><jats:sub>th</jats:sub> = 80% shows three distinct stages: an increase till <jats:italic>ε</jats:italic><jats:sub>th</jats:sub> ≈ 15%, a plato in the interval ≈15–40%, and again some increase at <jats:italic>ε</jats:italic><jats:sub>th</jats:sub> ≥ 40%. This behavior is found to be associated with an increase in dislocation density at the first stage, the formation of kink bands at the second stage, and the development of shear bands with fine lamellar internal substructure at the third stage. After cold rolling to 80%, the alloy demonstrates the yield strength of 1220 MPa, peak strength 1320 MPa, and elongation to fracture 3.4%. A short steady‐state flow stage is observed on the engineering stress–strain curve that can also be associated with kinking.</jats:p></jats:sec>

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