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Research Highlight

Gradient Cell Structured High-Entropy Alloy Exhibits Exceptional Strength and Ductility

Scientific Achievement

A gradient dislocation-cell structure (GDS) was controllably introduced into a Al0.1CoCrFeNi high-entropy alloy (HEA) via cyclic-torsion, which activated a novel stacking-fault-induced plasticity (SFIP) mechanism and significantly improved the strength and ductility.

Significance and Impact

The GDS can be used for a wide variety of alloys to achieve superior properties for advanced engineering applications.

Research Details

– The GDS Al0.1CoCrFeNi alloys show superior strength/ductility compared to other types of gradient structured alloys.
– Microscopy revealed the GDS and atom probe tomography (APT) confirmed a homogenous distribution of elements.
– In situ neutron diffraction dynamically detected the novel SFIP mechanism and synchrotron diffraction revealed the stacking fault distribution along the GDS.
 

Q. Pan, L. Zhang, R. Feng, Q. Lu, K. An, A. C. Chuang, J. D. Poplawsky, P. K. Liaw, and L. Lu, "Gradient-Cell-Structured High-Entropy Alloy with Exceptional Strength and Ductility," Science (2021). DOI: 10.1126/science.abj8114