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Real-time observations of TRIP-induced ultrahigh strain hardening in a dual-phase CrMnFeCoNi high-entropy alloy

Author

Listed:
  • Sijing Chen

    (Zhejiang University)

  • Hyun Seok Oh

    (Seoul National University)

  • Bernd Gludovatz

    (UNSW Sydney)

  • Sang Jun Kim

    (Seoul National University)

  • Eun Soo Park

    (Seoul National University)

  • Ze Zhang

    (Zhejiang University)

  • Robert O. Ritchie

    (Lawrence Berkeley National Laboratory
    University of California)

  • Qian Yu

    (Zhejiang University)

Abstract

Strategies involving metastable phases have been the basis of the design of numerous alloys, yet research on metastable high-entropy alloys is still in its infancy. In dual-phase high-entropy alloys, the combination of local chemical environments and loading-induced crystal structure changes suggests a relationship between deformation mechanisms and chemical atomic distribution, which we examine in here in a Cantor-like Cr20Mn6Fe34Co34Ni6 alloy, comprising both face-centered cubic (fcc) and hexagonal closed packed (hcp) phases. We observe that partial dislocation activities result in stable three-dimensional stacking-fault networks. Additionally, the fraction of the stronger hcp phase progressively increases during plastic deformation by forming at the stacking-fault network boundaries in the fcc phase, serving as the major source of strain hardening. In this context, variations in local chemical composition promote a high density of Lomer-Cottrell locks, which facilitate the construction of the stacking-fault networks to provide nucleation sites for the hcp phase transformation.

Suggested Citation

  • Sijing Chen & Hyun Seok Oh & Bernd Gludovatz & Sang Jun Kim & Eun Soo Park & Ze Zhang & Robert O. Ritchie & Qian Yu, 2020. "Real-time observations of TRIP-induced ultrahigh strain hardening in a dual-phase CrMnFeCoNi high-entropy alloy," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-14641-1
    DOI: 10.1038/s41467-020-14641-1
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    Cited by:

    1. Hyun Chung & Won Seok Choi & Hosun Jun & Hyeon-Seok Do & Byeong-Joo Lee & Pyuck-Pa Choi & Heung Nam Han & Won-Seok Ko & Seok Su Sohn, 2023. "Doubled strength and ductility via maraging effect and dynamic precipitate transformation in ultrastrong medium-entropy alloy," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    2. Chongle Zhang & Shuaiyang Liu & Jinyu Zhang & Dongdong Zhang & Jie Kuang & Xiangyun Bao & Gang Liu & Jun Sun, 2023. "Trifunctional nanoprecipitates ductilize and toughen a strong laminated metastable titanium alloy," Nature Communications, Nature, vol. 14(1), pages 1-10, December.

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