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Department and Staff News

2018-12-05
ME scholar co-authored a paper in Science on high-entropy alloys

Advanced structural materials with gigapascal strength and high ductility are highly desirable for a wide range of engineering applications, such as aerospace, automotive, marine, and constructions. However, most metallurgical mechanisms for increasing material strength lead to a loss of ductility.

A new study about multicomponent-nanoparticle-strengthened high-entropy alloys, co-authored by Dr. Zengbao Jiao, assistant professor of Department of Mechanical Engineering, was recently published in Science. In collaboration with Prof. C.T. Liu from CityU and other colleagues from BUT, IMR, and CSU, the researchers designed new Fe-Co-Ni-Al-Ti high-entropy alloys, which exhibit superb mechanical properties with 1.5 GPa tensile strength and 50% uniform elongation. Atom probe tomography (APT) reveals that the nanoparticles have multicomponent compositions, and the key of alloy development is getting the composition tuned correctly, such that the nanoparticles can fully exert the strengthening effect and also help to maintain high work-hardening ability and plastic deformation stability. This multicomponent-nanoparticle-strengthening strategy offers a new paradigm to develop next-generation materials for structural applications.

Read more at: T. Yang, Y.L. Zhao, Y. Tong, Z.B. Jiao, J. Wei, J.X. Cai, X.D. Han, D. Chen, A. Hu, J.J. Kai, K. Lu, Y. Liu, C.T. Liu. Multicomponent intermetallic nanoparticles and superb mechanical behaviors of complex alloys. Science, 2018; 362 (6417): 933.