Nanoscale origins of the damage tolerance of the high-entropy alloy CrMnFeCoNi

ZiJiao Zhang, M. M. Mao, Jiangwei Wang, Bernd Gludovatz, Ze Zhang, Scott X. Mao, Easo P. George, Qian Yu () and Robert O. Ritchie ()
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ZiJiao Zhang: Center of Electron Microscopy and State Key Laboratory of Silicon Materials, Zhejiang University
M. M. Mao: Center of Electron Microscopy and State Key Laboratory of Silicon Materials, Zhejiang University
Jiangwei Wang: University of Pittsburgh
Bernd Gludovatz: Lawrence Berkeley National Laboratory
Ze Zhang: Center of Electron Microscopy and State Key Laboratory of Silicon Materials, Zhejiang University
Scott X. Mao: Center of Electron Microscopy and State Key Laboratory of Silicon Materials, Zhejiang University
Easo P. George: Institute for Materials, Ruhr University
Qian Yu: Center of Electron Microscopy and State Key Laboratory of Silicon Materials, Zhejiang University
Robert O. Ritchie: Lawrence Berkeley National Laboratory

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract Damage tolerance can be an elusive characteristic of structural materials requiring both high strength and ductility, properties that are often mutually exclusive. High-entropy alloys are of interest in this regard. Specifically, the single-phase CrMnFeCoNi alloy displays tensile strength levels of ∼1 GPa, excellent ductility (∼60–70%) and exceptional fracture toughness (KJIc>200 MPa√m). Here through the use of in situ straining in an aberration-corrected transmission electron microscope, we report on the salient atomistic to micro-scale mechanisms underlying the origin of these properties. We identify a synergy of multiple deformation mechanisms, rarely achieved in metallic alloys, which generates high strength, work hardening and ductility, including the easy motion of Shockley partials, their interactions to form stacking-fault parallelepipeds, and arrest at planar slip bands of undissociated dislocations. We further show that crack propagation is impeded by twinned, nanoscale bridges that form between the near-tip crack faces and delay fracture by shielding the crack tip.

Date: 2015
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DOI: 10.1038/ncomms10143

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