Exploring the Effect of Ti on Mechanical and Tribological Properties of an AlCrFe<sub>2</sub>Ni<sub>2</sub>Ti<sub>x</sub> High-Entropy Alloy
Low friction and wear constitute a challenge for metallic materials under dry sliding conditions. In the current study, we successfully prepared an AlCrFe<sub>2</sub>Ni<sub>2</sub>Ti<sub>x</sub> (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) high-entropy alloy (HEA) consisting...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
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| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/15/2/121 |
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| Summary: | Low friction and wear constitute a challenge for metallic materials under dry sliding conditions. In the current study, we successfully prepared an AlCrFe<sub>2</sub>Ni<sub>2</sub>Ti<sub>x</sub> (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) high-entropy alloy (HEA) consisting of a body-centered cubic (BCC) phase and an AlNi<sub>2</sub>Ti phase that exhibited an outstanding combination of a compression strength of above 3 GPa and a ductility degree of 26% at room temperature. Under a 20 N load, the dry friction tests showed that AlCrFe<sub>2</sub>Ni<sub>2</sub>Ti<sub>0.4</sub> HEA had the lowest wear volume (1.498 mm<sup>3</sup>), with a coefficient of friction of 0.3929. It is related to the volume fraction of AlNi<sub>2</sub>Ti precipitate increasing with increasing Ti content, thus resulting in better wear resistance. Through the strengthening mechanism analysis, it is crucial to manipulate the composition of the AlNi<sub>2</sub>Ti precipitate to obtain desirable mechanical properties in the AlCrFe<sub>2</sub>Ni<sub>2</sub>Ti<sub>x</sub> HEA. The main mechanism of wear friction is identified as adhesion wear. Therefore, the addition of Ti into AlCrFe<sub>2</sub>Ni<sub>2</sub> HEA can effectively improve its mechanical and wear resistance due to the significant improvement in hardness and its inherent solution strengthening. Our study provides a new strategy for designing new BCC HEAs with a combination of high hardness, yield strength, and excellent wear. |
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| ISSN: | 2075-4701 |