Pt-induced atomic-level tailoring towards paracrystalline high-entropy alloy

Xingjia He; Yu Zhang; Xinlei Gu; Jiangwei Wang; Jinlei Qi; Jun Hao; Longpeng Wang; Hao Huang; Mao Wen; Kan Zhang; Weitao Zheng

doi:10.1038/s41467-023-36423-1

Pt-induced atomic-level tailoring towards paracrystalline high-entropy alloy

Nat Commun. 2023 Feb 11;14(1):775. doi: 10.1038/s41467-023-36423-1.

Authors

Xingjia He¹, Yu Zhang¹, Xinlei Gu¹, Jiangwei Wang², Jinlei Qi¹, Jun Hao¹, Longpeng Wang¹, Hao Huang³, Mao Wen⁴, Kan Zhang⁵, Weitao Zheng⁶

Affiliations

¹ State Key Laboratory of Superhard Materials, School of Materials Science and Engineering and Key Laboratory of Automobile Materials, MOE, Jilin University, 130012, Changchun, People's Republic of China.
² Center of Electron Microscopy and State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, 310027, Hangzhou, People's Republic of China.
³ AECC Beijing Institute of Aeronautical Materials, 81-15 110095, Beijing, China.
⁴ State Key Laboratory of Superhard Materials, School of Materials Science and Engineering and Key Laboratory of Automobile Materials, MOE, Jilin University, 130012, Changchun, People's Republic of China. wenmao225@jlu.edu.cn.
⁵ State Key Laboratory of Superhard Materials, School of Materials Science and Engineering and Key Laboratory of Automobile Materials, MOE, Jilin University, 130012, Changchun, People's Republic of China. kanzhang@jlu.edu.cn.
⁶ State Key Laboratory of Superhard Materials, School of Materials Science and Engineering and Key Laboratory of Automobile Materials, MOE, Jilin University, 130012, Changchun, People's Republic of China. wtzheng@jlu.edu.cn.

Abstract

Paracrystalline state achieved in the diamond system guides a direction to explore the missing link between amorphous and crystalline states. However, such a state is still challenging to reach in alloy systems in a controlled manner. Here, based on the vast composition space and the complex atomic interactions in the high-entropy alloys (HEAs), we present an "atomic-level tailoring" strategy to create the paracrystalline HEA. The addition of atomic-level Pt with the large and negative mixing enthalpy induces the local atomic reshuffling around Pt atoms for the well-targeted local amorphization, which separates severe-distorted crystalline Zr-Nb-Hf-Ta-Mo HEA into the high-density crystalline MRO motifs on atomic-level. The paracrystalline HEA exhibits high hardness (16.6 GPa) and high yield strength (8.37 GPa) and deforms by nanoscale shear-banding and nanocrystallization modes. Such an enthalpy-guided strategy in HEAs can provide the atomic-level tailoring ability to purposefully regulate structural characteristics and desirable properties.

Abstract

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