A nanocrystalline AlCoCuNi medium-entropy alloy with high thermal stability via entropy and boundary engineering
| Autor: | T. Zhang, C.S. Liu, Y. Xiong, Z.M. Xie, R. Liu, J.F. Yang, H.W. Deng, Ming-Shan Wang, Qi-Wu Fang, Yuntang Chen, X.P. Wang |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Nanostructure Mechanical Engineering Alloy Spark plasma sintering 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Nanocrystalline material Grain size 0104 chemical sciences Mechanics of Materials engineering Entropy (information theory) General Materials Science Thermal stability Grain boundary Composite material 0210 nano-technology |
| Zdroj: | Materials Science and Engineering: A. 774:138925 |
| ISSN: | 0921-5093 |
| Popis: | A promising strategy involving the synergetic effects of the high-entropy engineering and interface architectures has been proposed to realize the thermal stability of nanocrystalline alloys. A bulk dual-phase nanocrystalline (DPNC-) AlCoCuNi medium-entropy alloy was prepared by mechanical alloying (MA) and spark plasma sintering (SPS) process. These DPNC structures include Cu-rich and AlCoNi-rich nanocrystallines (NCs) with an average grain size of 46 nm. This DPNC-AlCoCuNi material could maintain the nanostructures as well as a high hardness of about 580 HV even after annealing at 900 °C for 50 h. The extremely high thermal stability has been attributed to the extensive thermal-stabled low-energy phase boundaries, low-angle grain boundaries, the high-entropy and sluggish diffusion effects. |
| Databáze: | OpenAIRE |
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