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Strengthening CoCrNi medium-entropy alloy by tuning lattice defects

Journal Article


Abstract


  • The CrCoNi medium-entropy alloy is not fully utilized at room temperature circumstance due to its low strength, despite excellent cryogenic mechanical properties. Here we report that, a superior room temperature strength (1.6 GPa and 407.6 Hv) has been obtained in the single phase CoCrNi medium-entropy alloy, by carefully tuning the formation of multiple lattice defects. Electron microscopy characterizations show that such high-strength CoCrNi alloy contains favorable heterostructures of coarsening grains (~30 ��m) and ultrafine grains (~1 ��m), together with the high density of dislocation cells, small stacking faults, ultrafine nanotwins (~9 nm in thickness) and Lomer���Cottrell locks.

Publication Date


  • 2020

Citation


  • Huang, H., Wang, J., Yang, H., Ji, S., Yu, H., & Liu, Z. (2020). Strengthening CoCrNi medium-entropy alloy by tuning lattice defects. Scripta Materialia, 188, 216-221. doi:10.1016/j.scriptamat.2020.07.027

Scopus Eid


  • 2-s2.0-85088656120

Start Page


  • 216

End Page


  • 221

Volume


  • 188

Issue


Place Of Publication


Abstract


  • The CrCoNi medium-entropy alloy is not fully utilized at room temperature circumstance due to its low strength, despite excellent cryogenic mechanical properties. Here we report that, a superior room temperature strength (1.6 GPa and 407.6 Hv) has been obtained in the single phase CoCrNi medium-entropy alloy, by carefully tuning the formation of multiple lattice defects. Electron microscopy characterizations show that such high-strength CoCrNi alloy contains favorable heterostructures of coarsening grains (~30 ��m) and ultrafine grains (~1 ��m), together with the high density of dislocation cells, small stacking faults, ultrafine nanotwins (~9 nm in thickness) and Lomer���Cottrell locks.

Publication Date


  • 2020

Citation


  • Huang, H., Wang, J., Yang, H., Ji, S., Yu, H., & Liu, Z. (2020). Strengthening CoCrNi medium-entropy alloy by tuning lattice defects. Scripta Materialia, 188, 216-221. doi:10.1016/j.scriptamat.2020.07.027

Scopus Eid


  • 2-s2.0-85088656120

Start Page


  • 216

End Page


  • 221

Volume


  • 188

Issue


Place Of Publication