期刊
INTERMETALLICS
卷 143, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2022.107472
关键词
Refractory medium-entropy alloys; Microstructure; Mechanical properties; Strengthening mechanisms; Alloy design
资金
- National Natural Science Foundation of China [51861016, 52061021, 52071276]
- Fundamental Research Funds for the Central Universities of China [2021CDJQY-040]
- Chongqing Special Project of Science and Technology Innovation of China [cstc2021yszx-jcyj0007]
In this study, a series of refractory medium-entropy alloys with excellent plasticity were designed and prepared using phase diagram calculation software. The synergistic effects of V and Ti on the microstructure, mechanical properties, and strengthening mechanisms of these alloys were investigated. The results showed that careful composition design can result in high-strength alloys with excellent plasticity.
Most refractory complex concentrated alloys (CCAs) exhibit limited plasticity and high density, which greatly limits their large-scale applications. To address these issues, a series of Nb31Ti37-xZr26Al6Vx (x = 3, 5, 7, 9, and 11 at. %) refractory medium-entropy alloys (RMEAs) were designed and prepared in this work with the help of phase diagram calculation software. The synergistic effects of V and Ti on the microstructure, mechanical properties, and strengthening mechanisms of Nb31Ti37-xZr26Al6Vx RMEAs are investigated in detail. Compared with the reported CCAs with limited plasticity and high density, our alloys with a single BCC structure offer excellent compressive plasticity greater than 50% at room temperature and a lower density less than 6.4 g/cm(3). Alloys have higher yield strength at room temperature with the increasing content of V. The high yield strength of alloys primarily originates from the inherent yield strength of the alloy's components and the solution strengthening resulting from the lattice distortion. The alloys studied in this work provide evidence that the high-strength RMEAs with excellent plasticity can be obtained through careful composition design.
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