Ultra-strong tungsten refractory high-entropy alloy via stepwise controllable coherent nanoprecipitations

Tong Li, Tianwei Liu, Shiteng Zhao, Yan Chen, Junhua Luan, Zengbao Jiao, Robert O. Ritchie () and Lanhong Dai ()
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Tong Li: Chinese Academy of Sciences
Tianwei Liu: Chinese Academy of Sciences
Shiteng Zhao: Beihang University
Yan Chen: Chinese Academy of Sciences
Junhua Luan: City University of Hong Kong
Zengbao Jiao: Hong Kong Polytechnic University
Robert O. Ritchie: Lawrence Berkeley National Laboratory
Lanhong Dai: Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract High-performance refractory alloys with ultrahigh strength and ductility are in demand for a wide range of critical applications, such as plasma-facing components. However, it remains challenging to increase the strength of these alloys without seriously compromising their tensile ductility. Here, we put forward a strategy to “defeat” this trade-off in tungsten refractory high-entropy alloys by stepwise controllable coherent nanoprecipitations (SCCPs). The coherent interfaces of SCCPs facilitate the dislocation transmission and relieve the stress concentrations that can lead to premature crack initiation. As a consequence, our alloy displays an ultrahigh strength of 2.15 GPa with a tensile ductility of 15% at ambient temperature, with a high yield strength of 1.05 GPa at 800 °C. The SCCPs design concept may afford a means to develop a wide range of ultrahigh-strength metallic materials by providing a pathway for alloy design.

Date: 2023
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DOI: 10.1038/s41467-023-38531-4

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