Dislocation mechanisms and 3D twin architectures generate exceptional strength-ductility-toughness combination in CrCoNi medium-entropy alloy

Zhang, Zijiao; Sheng, Hongwei; Wang, Zhangjie; Gludovatz, Bernd; Zhang, Ze; George, Easo P.; Yu, Qian; Mao, Scott X.; Ritchie, Robert O.

doi:10.1038/ncomms14390

Title: Dislocation mechanisms and 3D twin architectures generate exceptional strength-ductility-toughness combination in CrCoNi medium-entropy alloy

Journal Article · Mon Feb 20 00:00:00 EST 2017 · Nature Communications

DOI:https://doi.org/10.1038/ncomms14390· OSTI ID:1376451

Zhang, Zijiao ^[1]; Sheng, Hongwei ^[2]; Wang, Zhangjie ^[3];

^[4]; Zhang, Ze ^[1]; George, Easo P. ^[5]; Yu, Qian ^[1]; Mao, Scott X. ^[6];

^[7]

Zhejiang Univ., Hangzhou (China). Dept. of Materials Science and Engineering. Center of Electron Microscopy. State Key Lab. of Silicon Materials
George Mason Univ., Fairfax, VA (United States). Dept. of Physics and Astronomy
Xi'an Jiaotong Univ., Xi'an (China). Dept. of Materials Science and Engineering
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Sciences and Technology Division
Zhejiang Univ., Hangzhou (China). Dept. of Materials Science and Engineering. Center of Electron Microscopy. State Key Lab. of Silicon Materials; Univ. of Pittsburgh, PA (United States). Dept. of Mechanical Engineering and Materials Science
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Engineering

Combinations of high strength and ductility are hard to attain in metals. Exceptions include materials exhibiting twinning-induced plasticity. To understand how the strength-ductility trade-off can be defeated, we apply in situ, and aberration-corrected scanning, transmission electron microscopy to examine deformation mechanisms in the medium-entropy alloy CrCoNi that exhibits one of the highest combinations of strength, ductility and toughness on record. Ab initio modelling suggests that it has negative stacking-fault energy at 0K and high propensity for twinning. With deformation we find that a three-dimensional (3D) hierarchical twin network forms from the activation of three twinning systems. This serves a dual function: conventional twin-boundary (TB) strengthening from blockage of dislocations impinging on TBs, coupled with the 3D twin network which offers pathways for dislocation glide along, and cross-slip between, intersecting TB-matrix interfaces. The stable twin architecture is not disrupted by interfacial dislocation glide, serving as a continuous source of strength, ductility and toughness.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); State Key Program for Basic Research in China

Contributing Organization:: Univ. of California, Berkeley, CA (United States); Univ. of Pittsburgh, PA (United States); Xi'an Jiaotong Univ., Xi'an (China); George Mason Univ., Fairfax, VA (United States)

Grant/Contract Number:: AC05-00OR22725; AC02-05CH11231; DMR-1611064; 2015CB65930

OSTI ID:: 1376451

Alternate ID(s):: OSTI ID: 1398464

Journal Information:: Nature Communications, Vol. 8; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 375 works

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Influence of Annealing on Microstructure and Mechanical Properties of a Nanocrystalline CrCoNi Medium-Entropy Alloy Schuh, Benjamin; Völker, Bernhard; Todt, Juraj Materials, Vol. 11, Issue 5 https://doi.org/10.3390/ma11050662	journal	April 2018
Generalized Stacking Fault Energy of Al-Doped CrMnFeCoNi High-Entropy Alloy Sun, Xun; Zhang, Hualei; Li, Wei Nanomaterials, Vol. 10, Issue 1 https://doi.org/10.3390/nano10010059	journal	December 2019
‘Unzipping’ of twin lamella in nanotwinned nickel nanowires under flexural bending Wang, Binjun; Zhang, Hongti; Lou, Jun Figshare https://doi.org/10.6084/m9.figshare.5518954	text	January 2017
‘Unzipping’ of twin lamella in nanotwinned nickel nanowires under flexural bending Wang, Binjun; Zhang, Hongti; Lou, Jun Materials Research Letters, Vol. 6, Issue 1 https://doi.org/10.1080/21663831.2017.1383317	journal	October 2017
Influence of Annealing on Microstructure and Mechanical Properties of a Nanocrystalline CrCoNi Medium-Entropy Alloy Schuh, Benjamin; Völker, Bernhard; Todt, Juraj Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2018-01848	text	January 2018
‘Unzipping’ of twin lamella in nanotwinned nickel nanowires under flexural bending Wang, Binjun; Zhang, Hongti; Lou, Jun Figshare https://doi.org/10.6084/m9.figshare.5518954.v1	text	January 2017
Pseudo-binary and pseudo-ternary diffusion couple methods for estimation of the diffusion coefficients in multicomponent systems and high entropy alloys Esakkiraja, Neelamegan; Pandey, Keerti; Dash, Anuj Taylor & Francis https://doi.org/10.6084/m9.figshare.8186873.v1	text	January 2019
Pseudo-binary and pseudo-ternary diffusion couple methods for estimation of the diffusion coefficients in multicomponent systems and high entropy alloys Esakkiraja, Neelamegan; Pandey, Keerti; Dash, Anuj Taylor & Francis https://doi.org/10.6084/m9.figshare.8186873	text	January 2019
Tunable stacking fault energies by tailoring local chemical order in CrCoNi medium-entropy alloys Ding, Jun; Yu, Qin; Asta, Mark arXiv https://doi.org/10.48550/arxiv.1806.00718	text	January 2018
Strengthening in multi-principal element alloys with local-chemical-order roughened dislocation pathways Li, Qing-Jie; Sheng, Howard; Ma, Evan arXiv https://doi.org/10.48550/arxiv.1904.07681	text	January 2019
Crystallographically degenerate B2 precipitation in a plastically deformed fcc-based complex concentrated alloy Choudhuri, Deep; Shukla, Shivakant; Green, Whitley B. Taylor & Francis https://doi.org/10.6084/m9.figshare.5822160.v1	text	January 2018
Stacking Fault Energy Analyses of Additively Manufactured Stainless Steel 316L and CrCoNi Medium Entropy Alloy Using In Situ Neutron Diffraction Woo, W.; Jeong, J. S.; Kim, D. -K. Scientific Reports, Vol. 10, Issue 1 https://doi.org/10.1038/s41598-020-58273-3	journal	January 2020

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